Presented at ICTC2018(9th International Conference on Information and Communication Technology Convergence)
Date : Oct 18, 2018
Place : Jeju, Korea
DOI) 10.1109/ICTC.2018.8539461
URL) https://ieeexplore.ieee.org/document/8539461
[ URL of the paper/preprint ]
https://www.researchgate.net/publication/328364760_Boosting_the_Performance_of_Nested_Spatial_Mapping_with_Unequal_Modulation_in_80211n
[ Prior works of Nested Spatial Mapping without Unequal Modulation(UEQM) ]
https://www.slideshare.net/ealwanlee/nested-mimo-lectures-in-2017-seoul
[ List of the articles related with this slide ]
https://www.linkedin.com/pulse/list-articles-nested-spatial-mapping-wlan80211n-ealwan-lee/
High Accuracy Distance Measurement for Bluetooth Based on Phase RangingEalwan Lee
Β
Recent updates as of Dec 2021
High Accuracy Distance Measurement feature renamed to Channel Sounding
--
Presented at TTA ICT Standard Forum/Expert Workshop (2019)
https://expert.tta.or.kr/not/noticeView.do?selectedId=342
[ Date & Time ] May 24, 2019 (11:40 am ~ 12:00 pm)
[ Place ] Gonjiam Resort, Opus2
Follow-up technical article
"Tone-based Measurement of Excess Group Delay in Programmable Gain Receiver Chains for RF Ranging"
https://lnkd.in/gDNAYJJ5
TTA Journal, vol. 183, pp. 78 - 81, May/June 2019
http://tta.or.kr/data/reporthosulist_view.jsp?kind_num=1&hosu=183
http://tta.or.kr/ebook/ecatalog.jsp?catimage=1&Dir=65&start=78
https://www.nl.go.kr/NL/search/printMarcPop.do?viewKey=731242459&viewType=AH7
https://www.slideshare.net/secret/eTBKGDmxmYPjlG
TTA ICT standard weekly, no. 933, Jul. 8, 2019
http://tta.or.kr/data/weekly_view.jsp?news_id=6221
http://weekly.tta.or.kr/weekly/files/20192505042551_weekly.pdf
Practical issues to be considered in PHY layer of 802.11 standard specEalwan Lee
Β
This document discusses practical issues to consider in the PHY layer of 802.11 standards, including: multi-station scenarios of peak-to-peak packet swings and SIFS spaced sequences, ACS issues, imperfect transmitter quality like RF turn-on time and preamble EVM not tested in equipment, stress testing packet headers, and changes from 802.11-2012 to 802.11-2016 removing PMD/PLCP concepts. It concludes some imperfections are possible within standard specifications due to the uncoordinated ISM band, and proprietary features can disadvantage followers.
PHYSICAL LAYER for DIGITAL TELEVISION ATSC 3.0 STANDARD based on SC β FDMA .Roman M. Vitenberg
Β
Described a proposition for Physical Layer of Next generation broadcast television (NGBT) and ATSC 3.0 Television standard. The Proposed system is back compatible with existing ATSC standards A/53, A/153 and based on improved version of SC-FDMA modulation.
Cpqd's SDN activities in optical dwdm terabit networksCPqD
Β
CPqD is developing optical SDN technologies including:
1. An optical networking testbed with homemade network elements for research.
2. An optical SDN controller focused on specialized hardware, open interfaces, and network virtualization. The controller supports functions like YANG modeling, virtual optical network instantiation, and control plane with path computation element.
3. A next-generation reconfigurable optical add-drop multiplexer (NG-ROADM) platform being developed using the YANG modeling language. It will support colorless, directionless, and contentionless switching with flexible grid spectrum slots.
4. The development of an SDN convergent network (SDcN) architecture to provide a multilayer
This document outlines an agenda for a presentation on high capacity optical access networks. It discusses the growing demand for access network capacity driven by factors like increased mobile data usage and number of connected devices. It then covers various technologies being researched to increase access network capacity, such as coherent ultra-dense WDM passive optical networks (Coherent UDWDM PONs) that can provide terabit capacities. Specific areas of research discussed include mitigating crosstalk in high capacity PONs, using real-time coherent receivers, and integrating photonic integrated circuits. Field trials of digital coherent UDWDM PON systems are also summarized.
This document summarizes the work being done by CPqD towards developing terabit optical networks. It discusses:
1. The evolution of optical transmission rates from 100G to 400G and 1T using technologies like coherent transmission, higher order modulation formats, and carrier aggregation.
2. Advances in optical networking components like amplifiers, ROADMs, and integrated photonics to enable network control and monitoring.
3. Microelectronic developments like high-speed DACs and ASIC DSPs to support coherent transmission systems.
4. Experimental demonstrations and field trials of terabit superchannels using techniques like CO-OFDM, carrier aggregation, and flexible transmitters.
This document discusses the design and implementation of AM and QPSK software defined radio transmitters and receivers using the ZedBoard and FMComms4 RF transceiver. It begins with descriptions of the QPSK transmitter and receiver designs in Simulink, including resampling, modulation, filtering and data synchronization components. Implementation of the designs in HDL and resource utilization on the ZedBoard is also covered. In addition, an AM transmitter and receiver is presented which is able to transmit and recover an audio signal in under a second. The document provides guidance on building SDR systems on the ZedBoard from initial simulation to final hardware implementation.
The document discusses options for prototyping new physical layers for telecommunication systems using digital signal processing. It focuses on using DSP processors and FPGAs, as ASICs are not available. Examples are provided of prototypes that maximize the capabilities of available hardware. Specifically, a DSP processor was chosen as the platform for developing a discrete multi-tone transceiver, and FPGAs were used for real-time transmitter processing through techniques like parallel fractional sampling rate conversion. The document concludes that "platform FPGAs" have been important for research due to price and reconfigurability, though skilled developers are needed to explore parallelism for high bit rate implementations.
High Accuracy Distance Measurement for Bluetooth Based on Phase RangingEalwan Lee
Β
Recent updates as of Dec 2021
High Accuracy Distance Measurement feature renamed to Channel Sounding
--
Presented at TTA ICT Standard Forum/Expert Workshop (2019)
https://expert.tta.or.kr/not/noticeView.do?selectedId=342
[ Date & Time ] May 24, 2019 (11:40 am ~ 12:00 pm)
[ Place ] Gonjiam Resort, Opus2
Follow-up technical article
"Tone-based Measurement of Excess Group Delay in Programmable Gain Receiver Chains for RF Ranging"
https://lnkd.in/gDNAYJJ5
TTA Journal, vol. 183, pp. 78 - 81, May/June 2019
http://tta.or.kr/data/reporthosulist_view.jsp?kind_num=1&hosu=183
http://tta.or.kr/ebook/ecatalog.jsp?catimage=1&Dir=65&start=78
https://www.nl.go.kr/NL/search/printMarcPop.do?viewKey=731242459&viewType=AH7
https://www.slideshare.net/secret/eTBKGDmxmYPjlG
TTA ICT standard weekly, no. 933, Jul. 8, 2019
http://tta.or.kr/data/weekly_view.jsp?news_id=6221
http://weekly.tta.or.kr/weekly/files/20192505042551_weekly.pdf
Practical issues to be considered in PHY layer of 802.11 standard specEalwan Lee
Β
This document discusses practical issues to consider in the PHY layer of 802.11 standards, including: multi-station scenarios of peak-to-peak packet swings and SIFS spaced sequences, ACS issues, imperfect transmitter quality like RF turn-on time and preamble EVM not tested in equipment, stress testing packet headers, and changes from 802.11-2012 to 802.11-2016 removing PMD/PLCP concepts. It concludes some imperfections are possible within standard specifications due to the uncoordinated ISM band, and proprietary features can disadvantage followers.
PHYSICAL LAYER for DIGITAL TELEVISION ATSC 3.0 STANDARD based on SC β FDMA .Roman M. Vitenberg
Β
Described a proposition for Physical Layer of Next generation broadcast television (NGBT) and ATSC 3.0 Television standard. The Proposed system is back compatible with existing ATSC standards A/53, A/153 and based on improved version of SC-FDMA modulation.
Cpqd's SDN activities in optical dwdm terabit networksCPqD
Β
CPqD is developing optical SDN technologies including:
1. An optical networking testbed with homemade network elements for research.
2. An optical SDN controller focused on specialized hardware, open interfaces, and network virtualization. The controller supports functions like YANG modeling, virtual optical network instantiation, and control plane with path computation element.
3. A next-generation reconfigurable optical add-drop multiplexer (NG-ROADM) platform being developed using the YANG modeling language. It will support colorless, directionless, and contentionless switching with flexible grid spectrum slots.
4. The development of an SDN convergent network (SDcN) architecture to provide a multilayer
This document outlines an agenda for a presentation on high capacity optical access networks. It discusses the growing demand for access network capacity driven by factors like increased mobile data usage and number of connected devices. It then covers various technologies being researched to increase access network capacity, such as coherent ultra-dense WDM passive optical networks (Coherent UDWDM PONs) that can provide terabit capacities. Specific areas of research discussed include mitigating crosstalk in high capacity PONs, using real-time coherent receivers, and integrating photonic integrated circuits. Field trials of digital coherent UDWDM PON systems are also summarized.
This document summarizes the work being done by CPqD towards developing terabit optical networks. It discusses:
1. The evolution of optical transmission rates from 100G to 400G and 1T using technologies like coherent transmission, higher order modulation formats, and carrier aggregation.
2. Advances in optical networking components like amplifiers, ROADMs, and integrated photonics to enable network control and monitoring.
3. Microelectronic developments like high-speed DACs and ASIC DSPs to support coherent transmission systems.
4. Experimental demonstrations and field trials of terabit superchannels using techniques like CO-OFDM, carrier aggregation, and flexible transmitters.
This document discusses the design and implementation of AM and QPSK software defined radio transmitters and receivers using the ZedBoard and FMComms4 RF transceiver. It begins with descriptions of the QPSK transmitter and receiver designs in Simulink, including resampling, modulation, filtering and data synchronization components. Implementation of the designs in HDL and resource utilization on the ZedBoard is also covered. In addition, an AM transmitter and receiver is presented which is able to transmit and recover an audio signal in under a second. The document provides guidance on building SDR systems on the ZedBoard from initial simulation to final hardware implementation.
The document discusses options for prototyping new physical layers for telecommunication systems using digital signal processing. It focuses on using DSP processors and FPGAs, as ASICs are not available. Examples are provided of prototypes that maximize the capabilities of available hardware. Specifically, a DSP processor was chosen as the platform for developing a discrete multi-tone transceiver, and FPGAs were used for real-time transmitter processing through techniques like parallel fractional sampling rate conversion. The document concludes that "platform FPGAs" have been important for research due to price and reconfigurability, though skilled developers are needed to explore parallelism for high bit rate implementations.
Comparative Analysis of DP QPSK and DP 16-QAM Optical Coherent Receiver, with...IRJET Journal
Β
This document compares DP QPSK and DP 16-QAM optical coherent receivers in terms of average bit error rate (BER) when analyzing phase noise. It simulates a 112 Gbps DP 16-QAM and DP QPSK coherent receiver system with digital signal processing (DSP) using Optisystem and MATLAB. The analysis introduces noise before the receiver by varying the optical signal-to-noise ratio (OSNR) and measures average BER. Graphs of average BER versus OSNR are produced for different digital filters and filter orders to determine the filter with minimum phase noise. The DP 16-QAM system shows better power spectrum confinement and is analyzed in more detail.
IV WTON 2015 - Strategies for Future Flexible Optical TransceiversCPqD
Β
The document summarizes a presentation given by Jacklyn D. Reis on strategies for flexible optical transceivers. It discusses the use of digital signal processing techniques to enable flexible transmitter and receiver bandwidth and data rates. Experimental demonstrations showed synchronous rate and bandwidth switching at the transmitter and spectrally-sliced receivers using multiple coherent receivers. 400G superchannel transmission over 75GHz grids was also demonstrated using digital backpropagation to compensate for nonlinear fiber effects. Finally, a physical implementation of a nonlinear equalizer ASIC was discussed, showing area and power reductions using a 16nm FinFET process.
IEEE 1588 Timing for Mobile Backhaul webinar sponsored by Cisco. By 2015 there will be 5 billion mobile devices and 1.5 billion M2M nodes. Global mobile traffic will grow 26 times to 6.3 exabytes per month. Video will make up 66% of mobile traffic. Ethernet backhaul costs less per bit than TDM and has a flat cost structure. Mobile networks are transforming from linear TDM architectures to distributed IP/Ethernet architectures to scale with demand. Migration to Ethernet requires time synchronization which can be achieved using 1588v2 and SyncE technologies. 1588v2 supports both frequency and phase synchronization required for 4G/LTE networks.
TV Repack & ATSC 3.0: SFN & Future proofing antennaskmsavage
Β
This document summarizes a presentation about planning for TV repack and futureproofing antennas for ATSC 3.0. It discusses the incentive auction timeline, how many stations will be directly impacted, the process for stations moving to new channels after the auction. It covers considerations for antennas on lower channels like needing larger/heavier antennas. It also discusses futureproofing antennas for ATSC 3.0 like adding more null fill or making antennas compatible with single frequency networks. Signal strength requirements for different types of services are presented. Network planning assumptions and an example for a station in Baltimore are provided.
This document summarizes a public presentation about a 79GHz PMCW radar system-on-chip. Key points:
- The research investigates using nanoscale CMOS technology for 79GHz radar systems, which could enable cost-effective high-volume production and integration of large digital processing.
- A new phase-modulated continuous wave radar detection concept is introduced that is well-suited for CMOS integration.
- The presented 79GHz PMCW radar SoC implements all radar functions including phased-array transceivers, ADCs, and a digital correlator on a single 3x2.63mm die using 28nm CMOS technology.
This document summarizes a 79 GHz 2x2 MIMO PMCW radar system-on-chip implemented in 28nm CMOS. Key points:
- The SoC integrates two transmitters, two receivers, and mm-wave frequency generation to enable 2x2 MIMO operation with 5Β° angular resolution over Β±60Β°.
- It uses a phase modulated continuous wave (PMCW) approach with a 1.975 Gbps pseudorandom sequence. This allows 7.5cm range resolution through digital correlation without needing an FMCW linear ramp.
- Measurement results show the SoC consumes 1W of power while achieving the specified performance. An antenna module allows combining two SoCs for
This document discusses issues related to automotive radar interoperability as the use of radar systems in vehicles increases. It notes that having multiple radars operating in close proximity will create interference challenges. It describes the characteristics of phase-modulated continuous wave (PMCW) radar and how it compares to frequency-modulated continuous wave (FMCW) radar. It also discusses the susceptibility of PMCW radar to interference from other radar types and the need for standards to ensure radar interoperability on public roads. The document requests clarification on the status and timeline of the FCC rulemaking process regarding the 77-81 GHz band used by automotive radars.
System Architectures Using OIF CEI-56G Interfaces by
Nathan Tracy, Technologist, TE Connectivity and Technical Committee Chair, OIF. Presentation at Fiber Optics Expo 2015 in Tokyo, Japan, April 9, 2015
Using and OMA to Optimize QAM Optical Transceiversteledynelecroy
Β
This webinar demonstrated the optimization of a 28GBaud DP-16QAM modulated optical signal using an optical modulation analyzer. The presentation reviewed the system setup including electrical PAM4 signal generation, coherent optical transmission, and signal analysis using digital signal processing. Live demonstrations showed tuning the electrical PAM4 signals, optimizing the optical transmitter bias points and skew, and adjusting the signal levels for best performance. The goal was to maximize signal integrity for 16QAM optical transmission.
Analysis of Phase Noise and Gaussian Noise in terms of Average BER for DP 16-...IRJET Journal
Β
This document analyzes phase noise and Gaussian noise in terms of average bit error rate (BER) for a 112 Gbps dual polarization 16-QAM (DP 16-QAM) optical coherent receiver using digital signal processing (DSP) and different digital filters. It first describes the DP 16-QAM coherent receiver system and the DSP techniques used, including carrier phase estimation. It then simulates the system using Optisystem and MATLAB software and analyzes the phase noise before carrier phase estimation and Gaussian noise after by plotting average BER versus optical signal-to-noise ratio for various filter types and orders. The results show that the 3rd order Gaussian filter provided the lowest average BER and therefore the best noise performance.
Design of Adjustable Reconfigurable Wireless Single Core CORDIC based Rake Re...IOSR Journals
Β
In wireless communication system transmitted signals are subjected to multiple reflections,
diffractions and attenuation caused by obstacles such as buildings and hills, etc. At the receiver end, multiple
copies of the transmitted signal are received that arrive at clearly distinguishable time instants and are faded by
signal cancellation. Rake receiver is a technique to combine these so called multi-paths [2] by utilizing multiple
correlation receivers allocated to those delay positions on which the significant energy arrives which achieves a
significant improvement in the SNR of the output signal. This paper shows how the rake, including dispreading
and descrambling could be replaced by a receiver that can be implemented on a CORDIC based hardware
architecture. The performance in conjunction with the computational requirements of the receiver is widely
adjustable which is significantly better than that of the conventional rake receiver
This document evaluates and compares the performance of GFDM and OFDM waveforms in an LTE-A system level study. It finds that GFDM can achieve around 6dB reduction in out-of-band radiation compared to OFDM. BER, PER and throughput are similar between the two waveforms in different channel conditions. GFDM's out-of-band radiation can be reduced further using techniques like guard symbols or windowing. The document concludes that GFDM is a promising candidate for 5G waveforms.
Design of Continuous Time Multibit Sigma Delta ADC for Next Generation Wirele...IJERA Editor
Β
This paper presents the design of CT ΣΠmodulator which can provide high DR and SNR over a 20 MHz signal bandwidth. So far all the CT SDM uses either feedback or feedforward loop filter architecture. The proposed topology is a 3rd order low-pass sigma-delta modulator, which employs a combination of feedforward and feedback schemes. Loop filter is designed as RC integrators due to its high linearity and easy interface. The design starts from system level using Matlab/Simulink. Then, the first integrator in the loop, which is the most critical block in the modulator, is implemented at transistor level using Cadence Virtuoso 180 nm CMOS technology.
In OFDM-IDMA scheme, intersymbol interference (ISI) is resolved by the OFDM layer and multiple access interference (MAI) is suppressed by the IDMA layer at low cost . However OFDM-IDMA scheme suffers high peakto-average power ratio (PAPR) problem. For removing high PAPR problem a hybrid multiple access scheme SC-FDM-IDMA has been proposed. In this paper, bit error rate (BER) performance comparison of SC-FDM-IDMA scheme, OFDM-IDMA scheme and IDMA scheme have been duly presented. Moreover, the BER performance of various subcarrier mapping methods for SC-FDM-IDMA scheme as well as other results with variation of different parameters have also been demonstrated. Finally simulation result for BER performance improvement has been shown employing BCH code. All the simulation results demonstrate the suitability of SC-FDMIDMA scheme for wireless communication under AWGN channel environment.
The document compares the performance of a Root Raised Cosine matched filter implemented using hybrid-logarithmic arithmetic versus standard binary and floating point arithmetic. Simulations showed that the hybrid logarithmic structure offered superior performance to fixed point solutions while having significantly reduced complexity compared to floating point equivalents. The use of hybrid logarithmic arithmetic also has the potential to reduce power consumption, latency, and hardware complexity for mobile applications.
Comparative Analysis of DP QPSK and DP 16-QAM Optical Coherent Receiver, with...IRJET Journal
Β
This document compares DP QPSK and DP 16-QAM optical coherent receivers in terms of average bit error rate (BER) when analyzing phase noise. It simulates a 112 Gbps DP 16-QAM and DP QPSK coherent receiver system with digital signal processing (DSP) using Optisystem and MATLAB. The analysis introduces noise before the receiver by varying the optical signal-to-noise ratio (OSNR) and measures average BER. Graphs of average BER versus OSNR are produced for different digital filters and filter orders to determine the filter with minimum phase noise. The DP 16-QAM system shows better power spectrum confinement and is analyzed in more detail.
IV WTON 2015 - Strategies for Future Flexible Optical TransceiversCPqD
Β
The document summarizes a presentation given by Jacklyn D. Reis on strategies for flexible optical transceivers. It discusses the use of digital signal processing techniques to enable flexible transmitter and receiver bandwidth and data rates. Experimental demonstrations showed synchronous rate and bandwidth switching at the transmitter and spectrally-sliced receivers using multiple coherent receivers. 400G superchannel transmission over 75GHz grids was also demonstrated using digital backpropagation to compensate for nonlinear fiber effects. Finally, a physical implementation of a nonlinear equalizer ASIC was discussed, showing area and power reductions using a 16nm FinFET process.
IEEE 1588 Timing for Mobile Backhaul webinar sponsored by Cisco. By 2015 there will be 5 billion mobile devices and 1.5 billion M2M nodes. Global mobile traffic will grow 26 times to 6.3 exabytes per month. Video will make up 66% of mobile traffic. Ethernet backhaul costs less per bit than TDM and has a flat cost structure. Mobile networks are transforming from linear TDM architectures to distributed IP/Ethernet architectures to scale with demand. Migration to Ethernet requires time synchronization which can be achieved using 1588v2 and SyncE technologies. 1588v2 supports both frequency and phase synchronization required for 4G/LTE networks.
TV Repack & ATSC 3.0: SFN & Future proofing antennaskmsavage
Β
This document summarizes a presentation about planning for TV repack and futureproofing antennas for ATSC 3.0. It discusses the incentive auction timeline, how many stations will be directly impacted, the process for stations moving to new channels after the auction. It covers considerations for antennas on lower channels like needing larger/heavier antennas. It also discusses futureproofing antennas for ATSC 3.0 like adding more null fill or making antennas compatible with single frequency networks. Signal strength requirements for different types of services are presented. Network planning assumptions and an example for a station in Baltimore are provided.
This document summarizes a public presentation about a 79GHz PMCW radar system-on-chip. Key points:
- The research investigates using nanoscale CMOS technology for 79GHz radar systems, which could enable cost-effective high-volume production and integration of large digital processing.
- A new phase-modulated continuous wave radar detection concept is introduced that is well-suited for CMOS integration.
- The presented 79GHz PMCW radar SoC implements all radar functions including phased-array transceivers, ADCs, and a digital correlator on a single 3x2.63mm die using 28nm CMOS technology.
This document summarizes a 79 GHz 2x2 MIMO PMCW radar system-on-chip implemented in 28nm CMOS. Key points:
- The SoC integrates two transmitters, two receivers, and mm-wave frequency generation to enable 2x2 MIMO operation with 5Β° angular resolution over Β±60Β°.
- It uses a phase modulated continuous wave (PMCW) approach with a 1.975 Gbps pseudorandom sequence. This allows 7.5cm range resolution through digital correlation without needing an FMCW linear ramp.
- Measurement results show the SoC consumes 1W of power while achieving the specified performance. An antenna module allows combining two SoCs for
This document discusses issues related to automotive radar interoperability as the use of radar systems in vehicles increases. It notes that having multiple radars operating in close proximity will create interference challenges. It describes the characteristics of phase-modulated continuous wave (PMCW) radar and how it compares to frequency-modulated continuous wave (FMCW) radar. It also discusses the susceptibility of PMCW radar to interference from other radar types and the need for standards to ensure radar interoperability on public roads. The document requests clarification on the status and timeline of the FCC rulemaking process regarding the 77-81 GHz band used by automotive radars.
System Architectures Using OIF CEI-56G Interfaces by
Nathan Tracy, Technologist, TE Connectivity and Technical Committee Chair, OIF. Presentation at Fiber Optics Expo 2015 in Tokyo, Japan, April 9, 2015
Using and OMA to Optimize QAM Optical Transceiversteledynelecroy
Β
This webinar demonstrated the optimization of a 28GBaud DP-16QAM modulated optical signal using an optical modulation analyzer. The presentation reviewed the system setup including electrical PAM4 signal generation, coherent optical transmission, and signal analysis using digital signal processing. Live demonstrations showed tuning the electrical PAM4 signals, optimizing the optical transmitter bias points and skew, and adjusting the signal levels for best performance. The goal was to maximize signal integrity for 16QAM optical transmission.
Analysis of Phase Noise and Gaussian Noise in terms of Average BER for DP 16-...IRJET Journal
Β
This document analyzes phase noise and Gaussian noise in terms of average bit error rate (BER) for a 112 Gbps dual polarization 16-QAM (DP 16-QAM) optical coherent receiver using digital signal processing (DSP) and different digital filters. It first describes the DP 16-QAM coherent receiver system and the DSP techniques used, including carrier phase estimation. It then simulates the system using Optisystem and MATLAB software and analyzes the phase noise before carrier phase estimation and Gaussian noise after by plotting average BER versus optical signal-to-noise ratio for various filter types and orders. The results show that the 3rd order Gaussian filter provided the lowest average BER and therefore the best noise performance.
Design of Adjustable Reconfigurable Wireless Single Core CORDIC based Rake Re...IOSR Journals
Β
In wireless communication system transmitted signals are subjected to multiple reflections,
diffractions and attenuation caused by obstacles such as buildings and hills, etc. At the receiver end, multiple
copies of the transmitted signal are received that arrive at clearly distinguishable time instants and are faded by
signal cancellation. Rake receiver is a technique to combine these so called multi-paths [2] by utilizing multiple
correlation receivers allocated to those delay positions on which the significant energy arrives which achieves a
significant improvement in the SNR of the output signal. This paper shows how the rake, including dispreading
and descrambling could be replaced by a receiver that can be implemented on a CORDIC based hardware
architecture. The performance in conjunction with the computational requirements of the receiver is widely
adjustable which is significantly better than that of the conventional rake receiver
This document evaluates and compares the performance of GFDM and OFDM waveforms in an LTE-A system level study. It finds that GFDM can achieve around 6dB reduction in out-of-band radiation compared to OFDM. BER, PER and throughput are similar between the two waveforms in different channel conditions. GFDM's out-of-band radiation can be reduced further using techniques like guard symbols or windowing. The document concludes that GFDM is a promising candidate for 5G waveforms.
Design of Continuous Time Multibit Sigma Delta ADC for Next Generation Wirele...IJERA Editor
Β
This paper presents the design of CT ΣΠmodulator which can provide high DR and SNR over a 20 MHz signal bandwidth. So far all the CT SDM uses either feedback or feedforward loop filter architecture. The proposed topology is a 3rd order low-pass sigma-delta modulator, which employs a combination of feedforward and feedback schemes. Loop filter is designed as RC integrators due to its high linearity and easy interface. The design starts from system level using Matlab/Simulink. Then, the first integrator in the loop, which is the most critical block in the modulator, is implemented at transistor level using Cadence Virtuoso 180 nm CMOS technology.
In OFDM-IDMA scheme, intersymbol interference (ISI) is resolved by the OFDM layer and multiple access interference (MAI) is suppressed by the IDMA layer at low cost . However OFDM-IDMA scheme suffers high peakto-average power ratio (PAPR) problem. For removing high PAPR problem a hybrid multiple access scheme SC-FDM-IDMA has been proposed. In this paper, bit error rate (BER) performance comparison of SC-FDM-IDMA scheme, OFDM-IDMA scheme and IDMA scheme have been duly presented. Moreover, the BER performance of various subcarrier mapping methods for SC-FDM-IDMA scheme as well as other results with variation of different parameters have also been demonstrated. Finally simulation result for BER performance improvement has been shown employing BCH code. All the simulation results demonstrate the suitability of SC-FDMIDMA scheme for wireless communication under AWGN channel environment.
The document compares the performance of a Root Raised Cosine matched filter implemented using hybrid-logarithmic arithmetic versus standard binary and floating point arithmetic. Simulations showed that the hybrid logarithmic structure offered superior performance to fixed point solutions while having significantly reduced complexity compared to floating point equivalents. The use of hybrid logarithmic arithmetic also has the potential to reduce power consumption, latency, and hardware complexity for mobile applications.
This document appears to be an assignment on link adaptation and adaptive modulation and coding. It contains chapters on coding gain and BER, modulation gain and BER, adapting energy per bit, adapting coding technique, and adapting modulation technique. It also includes algorithms and flow charts for adapting energy per bit and coding/modulation techniques. The goal is to dynamically select modulation, coding, and transmission power based on changing channel conditions to optimize throughput while maintaining a target BER.
Cross-Layer Design of Raptor Codes for Video Multicast over 802.11n MIMO Chan...Berna Bulut
Β
This document summarizes a study on using Raptor codes in a cross-layer design for transmitting video over 802.11n MIMO channels. It presented a methodology to select the optimal transmission scheme (SM or STBC), modulation and coding scheme, and Raptor code rate based on channel conditions to minimize transmission time while maintaining low packet error rates. Simulation results showed that Raptor codes can improve performance by enabling higher order modulation at lower SNRs and reducing transmission times, especially in high spatial correlation conditions.
This document provides an agenda and guidelines for an Ericsson 2G training in April 2019. The agenda covers topics such as improving 2G KPIs like SDCCH congestion%, SDCCH drop%, TCH congestion%, and HO success rate. It also discusses optimizing processes like dynamic power control, call reestablishment, automatic neighbor relations, and handover optimization. Other topics include adaptive channel allocation, extended cell range, repeated downlink/SACCH transmissions, layer 2 reestablishment, and power saving features. The document provides explanations and recommendations for adjusting parameters to improve performance for each metric and process.
Development of Digital Controller for DC-DC Buck ConverterIJPEDS-IAES
Β
This paper presents a design & implementation of 3P3Z (3-pole 3-zero)
digital controller based on DSC (Digital Signal Controller) for low voltage
synchronous Buck Converter. The proposed control involves one voltage
control loop. Analog Type-3 controller is designed for Buck Converter using
standard frequency response techniques.Type-3 analog controller transforms
to 3P3Z controller in discrete domain.Matlab/Simulink model of the Buck
Converter with digital controller is developed. Simualtion results for steady
Keyword: state response and load transient response is tested using the model.
The document summarizes a research paper on the design of high-speed low-power Viterbi decoders for trellis coded modulation systems. It proposes a pre-computation architecture incorporated with the T-algorithm to effectively reduce power consumption without degrading decoding speed. The key aspects are:
1) A pre-computation approach is presented to calculate the optimal path metric in advance, allowing it to be determined faster and avoiding delays in the feedback loop.
2) A method is provided to systematically determine the optimal number of pre-computation steps needed to achieve the theoretical iteration bound for the Viterbi decoder.
3) Implementation results show the proposed pre-computation architecture can reduce power consumption by up to 70% without loss
DEVELOPMENT OF A SOFTWARE TOOL FOR PLANNING MICROWAVE SYSTEMS AT ABOVE 10 GHz, ESTIMATING CO-CHANNEL INTERFERENCE AND RAIN ATTENUAITON, USING ITU-MODEL ON MATLAB AND TO VALIDATE THE SOFTWARE AGAINST AN INDUSTRY STANDARD (CONNECT) TOOLβ
Communication Systems_B.P. Lathi and Zhi Ding (Lecture No 16-21)Adnan Zafar
Β
Lecture No 16: https://youtu.be/22XDP-_UKbg
Lecture No 17: https://youtu.be/CikQYWnvKdU
Lecture No 18: https://youtu.be/eT9sDYN4U30
Lecture No 19: https://youtu.be/7-jw3w9snik
Lecture No 20: https://youtu.be/kLmVgGSmfLE
Lecture No 21: https://youtu.be/Mm445diiQpM
OPTIMIZATION OF CMOS 0.18 M LOW NOISE AMPLIFIER USING NSGA-II FOR UWBVLSICS Design
Β
A design and optimization of 3-5 GHz single ended Radio Frequency (RF) Low Noise Amplifier (LNA) for ultra-wide-band (UWB) applications using standard UMC 0.18 Β΅m CMOS technology is reported. Designing of RF circuit components is a challenging job, since even after performing lengthy calculations and finding parameter values it is less guarantee that the design performs as expected. In view of this the optimization tool; Elitist Non-Dominated Sorting Genetic Algorithm (NSGA-II); has been employed to get the optimized starting values of components in the proposed LNA design. The obtained NSGA-II parameters were simulated using Cadence Spectre- RF simulator. The designed Low Noise Amplifier achieves a power gain of 22 dB and a minimum Noise Figure of 3 dB is achieved. It dissipates 12.5 mW of power out of 1.8 V supply
IRJET- Implementation of 16-Bit Pipelined ADC using 180nm CMOS TechnologyIRJET Journal
Β
This document describes the implementation of a 16-bit pipelined analog-to-digital converter (ADC) using 180nm CMOS technology. A 4-stage pipelined architecture is used, with each stage having a 4-bit resolution enabled by a successive approximation register (SAR) based sub-ADC. SAR ADCs consume low power but have speed and resolution limitations. To overcome these, a pipelined ADC is proposed that achieves high speed and low power consumption. Key blocks include SAR sub-ADCs, digital-to-analog converters, comparators, sample-and-hold circuits, and flip-flops. The design achieves medium sampling rate and 16-bit resolution for applications such as
The document discusses the design and simulation of a 3.8 GHz narrow bandpass switched capacitor filter implemented in a 180 nm CMOS technology. It begins by introducing switched capacitor filters and their advantages over traditional resistor-based filters. It then describes the implementation of a two-stage CMOS operational amplifier used in the filter design. Simulation results showing the amplifier's gain characteristics are presented. The document concludes by presenting the schematic and simulation results of the 3.8 GHz bandpass filter designed using the two-stage op-amp.
Parallel/flash ADCs use a voltage ladder and comparators to convert an analog input to a thermometer code. They can achieve sampling rates over 1GHz but require 2N-1 comparators. Interpolating and averaging ADCs reduce comparator count by interpolating between ladder voltages and averaging comparator outputs. Folding ADCs further reduce comparator count by mapping the input range onto a smaller set of subranges. Time-interleaved ADCs achieve high speeds by parallelizing conversions across multiple ADCs.
Gaussian Minimum Shift Keying (GMSK) is a form of continuous-phase frequency shift keying that uses a Gaussian filter to generate a constant envelope signal. It provides better spectral efficiency than MSK through bandwidth reduction while maintaining low intersymbol interference. GMSK is used widely in wireless technologies like GSM and CDPD due to its power efficiency and good bit error rate performance compared to other modulation schemes. While more spectrally efficient than MSK, GMSK also has slightly higher error rates and requires more complex receivers.
Research Inventy: International Journal of Engineering and Scienceresearchinventy
Β
This document summarizes various methods that have been proposed for implementing 16-QAM (Quadrature Amplitude Modulation) in FPGAs (Field Programmable Gate Arrays). It reviews architectures for carrier synchronization, equalization, and digital up/down conversion. The document then proposes a new system generator-based 16-QAM transmitter model that considers issues like symbol mapping, interpolation filtering, and up-conversion to an intermediate frequency. Simulation results demonstrating the transmitter constellation and resource usage on an FPGA are also presented.
Research Inventy : International Journal of Engineering and Science is publis...researchinventy
Β
This document summarizes various methods that have been proposed for implementing 16-QAM (Quadrature Amplitude Modulation) in FPGAs (Field Programmable Gate Arrays). It reviews architectures for carrier synchronization, equalization, and digital up/down conversion. The document then proposes a new system generator-based 16-QAM transmitter model that considers issues like symbol mapping, interpolation filtering, and up-conversion to an intermediate frequency. Simulation results demonstrating the transmitter constellation and resource usage on an FPGA are also presented.
Optimization of Cmos 0.18 Β΅M Low Noise Amplifier Using Nsga-Ii for UWB Applic...VLSICS Design
Β
A design and optimization of 3-5 GHz single ended Radio Frequency (RF) Low Noise Amplifier (LNA) for
ultra-wide-band (UWB) applications using standard UMC 0.18 ΞΌm CMOS technology is reported.
Designing of RF circuit components is a challenging job, since even after performing lengthy calculations
and finding parameter values it is less guarantee that the design performs as expected. In view of this the
optimization tool; Elitist Non-Dominated Sorting Genetic Algorithm (NSGA-II); has been employed to get
the optimized starting values of components in the proposed LNA design. The obtained NSGA-II
parameters were simulated using Cadence Spectre- RF simulator. The designed Low Noise Amplifier
achieves a power gain of 22 dB and a minimum Noise Figure of 3 dB is achieved. It dissipates 12.5 mW of
power out of 1.8 V supply.
This document summarizes a research paper that investigates reducing peak-to-average power ratio (PAPR) in an MC-CDMA system using partial transmit sequence (PTS) technique with a suboptimal combination algorithm. The paper simulates a downlink MC-CDMA system with BPSK and QPSK modulation under varying system parameters like number of users and phase sequences. Results show the complementary cumulative distribution function (CCDF) of PAPR for the original and PTS-processed signals. Using PTS with 4, 8, or 16 phase sequences provides 1dB, 2dB, and 4.2dB of PAPR reduction respectively compared to the original signal for a 8-user BPSK modulated MC-CD
Similar to Boosting the Performance of Nested Spatial Mapping with Unequal Modulation in 802.11n (20)
Tone-based Measurement of Excess Group Delay in Programmable Gain Receiver Ch...Ealwan Lee
Β
Presented at ISOCC-2022
Session info : Advanced Radio-Frequency Design Techniques
Date : Oct 21, 2022
Place : Gangneung, Korea
Cite with the shortened URL of
https://lnkd.in/gDNAYJJ5
[ URL/DOI of the paper/preprint ]
DOI) 10.1109/ISOCC56007.2022.10031373
URL) https://ieeexplore.ieee.org/document/10031373
For Channel Sounding (formerly HADM) of Bluetooth in the slide, see
https://lnkd.in/ggmWbnAJ
A Refined Skew Matrix Model of the CIM3 in the Up-Mixer Extending the Duality...Ealwan Lee
Β
Presented at RFIT-2022
Session info : Advanced Circuit and System Design
Date : Aug 30, 2022
Place : Busan, Korea
Cite with the shortened URL if you like
https://lnkd.in/gBhJmSRa
[ URL/DOI of the paper/preprint ]
DOI) 10.1109/RFIT54256.2022.9882474
URL) https://ieeexplore.ieee.org/document/9882474
https://www.researchgate.net/publication/363510202_A_Refined_Skew_Matrix_Model_of_the_CIM3_in_the_Up-Mixer_Extending_the_Duality_of_IQ_Imbalance
Following(corrective) work of https://lnkd.in/gwJhqgb8
A Method to Derate the Rate-Dependency in the Pass-Band Droop of Comb DecimatorsEalwan Lee
Β
Presented at ICSP2018(14th International Conference on Signal Processing)
Also served as a session chair of Session 1A1.
Date : Aug 13, 2018
Place : Beijing, China
DOI) 10.1109/ICSP.2018.8652330
URL) https://ieeexplore.ieee.org/document/8652330
[ URL of the paper/preprint ]
https://www.researchgate.net/publication/327130082_A_Method_to_Derate_the_Rate-Dependency_in_the_Pass-Band_Droop_of_Comb_Decimators
Joint Compensation of CIM3 and I/Q Imbalance in the Up-conversion Mixer with ...Ealwan Lee
Β
This document discusses a technique for jointly compensating for third-order intermodulation distortion (CIM3) and I/Q imbalance in an up-conversion mixer using a single skew matrix. It presents a simplified model showing that CIM3 can be modeled with two coefficients similar to the I/Q imbalance model. The technique allows for joint compensation of CIM3 and I/Q imbalance with a single matrix, providing an effective way to meet stringent emission requirements without the need for SAW filters. It also describes how the existing I/Q imbalance estimation method can be extended to estimate the CIM3 coefficients. Numerical results demonstrate that the technique can compensate initial CIM3 levels as high as -45dBc to within the -
A Lecture note on Nested MIMO in 2017, SeoulEalwan Lee
Β
The document presents a method for old wireless standards like 802.11n to achieve throughputs comparable to the latest standards like 802.11ac using a technique called nested spatial mapping with a single antenna. It works by attenuating the signal of a second stream and combining it with the first stream before transmission through a single antenna. This allows the signal to be decoded like 256QAM in 802.11ac while staying within the specifications of 802.11n. Simulation results show it can achieve over 20% higher throughput than standard 802.11n. Implementation requires only minor firmware changes and is backwards compatible.
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
Main news related to the CCS TSI 2023 (2023/1695)Jakub Marek
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An English π¬π§ translation of a presentation to the speech I gave about the main changes brought by CCS TSI 2023 at the biggest Czech conference on Communications and signalling systems on Railways, which was held in Clarion Hotel Olomouc from 7th to 9th November 2023 (konferenceszt.cz). Attended by around 500 participants and 200 on-line followers.
The original Czech π¨πΏ version of the presentation can be found here: https://www.slideshare.net/slideshow/hlavni-novinky-souvisejici-s-ccs-tsi-2023-2023-1695/269688092 .
The videorecording (in Czech) from the presentation is available here: https://youtu.be/WzjJWm4IyPk?si=SImb06tuXGb30BEH .
Dive into the realm of operating systems (OS) with Pravash Chandra Das, a seasoned Digital Forensic Analyst, as your guide. π This comprehensive presentation illuminates the core concepts, types, and evolution of OS, essential for understanding modern computing landscapes.
Beginning with the foundational definition, Das clarifies the pivotal role of OS as system software orchestrating hardware resources, software applications, and user interactions. Through succinct descriptions, he delineates the diverse types of OS, from single-user, single-task environments like early MS-DOS iterations, to multi-user, multi-tasking systems exemplified by modern Linux distributions.
Crucial components like the kernel and shell are dissected, highlighting their indispensable functions in resource management and user interface interaction. Das elucidates how the kernel acts as the central nervous system, orchestrating process scheduling, memory allocation, and device management. Meanwhile, the shell serves as the gateway for user commands, bridging the gap between human input and machine execution. π»
The narrative then shifts to a captivating exploration of prominent desktop OSs, Windows, macOS, and Linux. Windows, with its globally ubiquitous presence and user-friendly interface, emerges as a cornerstone in personal computing history. macOS, lauded for its sleek design and seamless integration with Apple's ecosystem, stands as a beacon of stability and creativity. Linux, an open-source marvel, offers unparalleled flexibility and security, revolutionizing the computing landscape. π₯οΈ
Moving to the realm of mobile devices, Das unravels the dominance of Android and iOS. Android's open-source ethos fosters a vibrant ecosystem of customization and innovation, while iOS boasts a seamless user experience and robust security infrastructure. Meanwhile, discontinued platforms like Symbian and Palm OS evoke nostalgia for their pioneering roles in the smartphone revolution.
The journey concludes with a reflection on the ever-evolving landscape of OS, underscored by the emergence of real-time operating systems (RTOS) and the persistent quest for innovation and efficiency. As technology continues to shape our world, understanding the foundations and evolution of operating systems remains paramount. Join Pravash Chandra Das on this illuminating journey through the heart of computing. π
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
Β
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind fΓΌr viele in der HCL-Community seit letztem Jahr ein heiΓes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und LizenzgebΓΌhren zu kΓ€mpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer mΓΆglich. Das verstehen wir und wir mΓΆchten Ihnen dabei helfen!
Wir erklΓ€ren Ihnen, wie Sie hΓ€ufige Konfigurationsprobleme lΓΆsen kΓΆnnen, die dazu fΓΌhren kΓΆnnen, dass mehr Benutzer gezΓ€hlt werden als nΓΆtig, und wie Sie ΓΌberflΓΌssige oder ungenutzte Konten identifizieren und entfernen kΓΆnnen, um Geld zu sparen. Es gibt auch einige AnsΓ€tze, die zu unnΓΆtigen Ausgaben fΓΌhren kΓΆnnen, z. B. wenn ein Personendokument anstelle eines Mail-Ins fΓΌr geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche FΓ€lle und deren LΓΆsungen. Und natΓΌrlich erklΓ€ren wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt nΓ€herbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Γberblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und ΓΌberflΓΌssigen Konten
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- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
Skybuffer SAM4U tool for SAP license adoptionTatiana Kojar
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Manage and optimize your license adoption and consumption with SAM4U, an SAP free customer software asset management tool.
SAM4U, an SAP complimentary software asset management tool for customers, delivers a detailed and well-structured overview of license inventory and usage with a user-friendly interface. We offer a hosted, cost-effective, and performance-optimized SAM4U setup in the Skybuffer Cloud environment. You retain ownership of the system and data, while we manage the ABAP 7.58 infrastructure, ensuring fixed Total Cost of Ownership (TCO) and exceptional services through the SAP Fiori interface.
Letter and Document Automation for Bonterra Impact Management (fka Social Sol...Jeffrey Haguewood
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Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on automated letter generation for Bonterra Impact Management using Google Workspace or Microsoft 365.
Interested in deploying letter generation automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Unlock the Future of Search with MongoDB Atlas_ Vector Search Unleashed.pdfMalak Abu Hammad
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Discover how MongoDB Atlas and vector search technology can revolutionize your application's search capabilities. This comprehensive presentation covers:
* What is Vector Search?
* Importance and benefits of vector search
* Practical use cases across various industries
* Step-by-step implementation guide
* Live demos with code snippets
* Enhancing LLM capabilities with vector search
* Best practices and optimization strategies
Perfect for developers, AI enthusiasts, and tech leaders. Learn how to leverage MongoDB Atlas to deliver highly relevant, context-aware search results, transforming your data retrieval process. Stay ahead in tech innovation and maximize the potential of your applications.
#MongoDB #VectorSearch #AI #SemanticSearch #TechInnovation #DataScience #LLM #MachineLearning #SearchTechnology
A Comprehensive Guide to DeFi Development Services in 2024Intelisync
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DeFi represents a paradigm shift in the financial industry. Instead of relying on traditional, centralized institutions like banks, DeFi leverages blockchain technology to create a decentralized network of financial services. This means that financial transactions can occur directly between parties, without intermediaries, using smart contracts on platforms like Ethereum.
In 2024, we are witnessing an explosion of new DeFi projects and protocols, each pushing the boundaries of whatβs possible in finance.
In summary, DeFi in 2024 is not just a trend; itβs a revolution that democratizes finance, enhances security and transparency, and fosters continuous innovation. As we proceed through this presentation, we'll explore the various components and services of DeFi in detail, shedding light on how they are transforming the financial landscape.
At Intelisync, we specialize in providing comprehensive DeFi development services tailored to meet the unique needs of our clients. From smart contract development to dApp creation and security audits, we ensure that your DeFi project is built with innovation, security, and scalability in mind. Trust Intelisync to guide you through the intricate landscape of decentralized finance and unlock the full potential of blockchain technology.
Ready to take your DeFi project to the next level? Partner with Intelisync for expert DeFi development services today!
Salesforce Integration for Bonterra Impact Management (fka Social Solutions A...Jeffrey Haguewood
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Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on integration of Salesforce with Bonterra Impact Management.
Interested in deploying an integration with Salesforce for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Monitoring and Managing Anomaly Detection on OpenShift.pdfTosin Akinosho
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Monitoring and Managing Anomaly Detection on OpenShift
Overview
Dive into the world of anomaly detection on edge devices with our comprehensive hands-on tutorial. This SlideShare presentation will guide you through the entire process, from data collection and model training to edge deployment and real-time monitoring. Perfect for those looking to implement robust anomaly detection systems on resource-constrained IoT/edge devices.
Key Topics Covered
1. Introduction to Anomaly Detection
- Understand the fundamentals of anomaly detection and its importance in identifying unusual behavior or failures in systems.
2. Understanding Edge (IoT)
- Learn about edge computing and IoT, and how they enable real-time data processing and decision-making at the source.
3. What is ArgoCD?
- Discover ArgoCD, a declarative, GitOps continuous delivery tool for Kubernetes, and its role in deploying applications on edge devices.
4. Deployment Using ArgoCD for Edge Devices
- Step-by-step guide on deploying anomaly detection models on edge devices using ArgoCD.
5. Introduction to Apache Kafka and S3
- Explore Apache Kafka for real-time data streaming and Amazon S3 for scalable storage solutions.
6. Viewing Kafka Messages in the Data Lake
- Learn how to view and analyze Kafka messages stored in a data lake for better insights.
7. What is Prometheus?
- Get to know Prometheus, an open-source monitoring and alerting toolkit, and its application in monitoring edge devices.
8. Monitoring Application Metrics with Prometheus
- Detailed instructions on setting up Prometheus to monitor the performance and health of your anomaly detection system.
9. What is Camel K?
- Introduction to Camel K, a lightweight integration framework built on Apache Camel, designed for Kubernetes.
10. Configuring Camel K Integrations for Data Pipelines
- Learn how to configure Camel K for seamless data pipeline integrations in your anomaly detection workflow.
11. What is a Jupyter Notebook?
- Overview of Jupyter Notebooks, an open-source web application for creating and sharing documents with live code, equations, visualizations, and narrative text.
12. Jupyter Notebooks with Code Examples
- Hands-on examples and code snippets in Jupyter Notebooks to help you implement and test anomaly detection models.
Building Production Ready Search Pipelines with Spark and MilvusZilliz
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Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
Let's Integrate MuleSoft RPA, COMPOSER, APM with AWS IDP along with Slackshyamraj55
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Discover the seamless integration of RPA (Robotic Process Automation), COMPOSER, and APM with AWS IDP enhanced with Slack notifications. Explore how these technologies converge to streamline workflows, optimize performance, and ensure secure access, all while leveraging the power of AWS IDP and real-time communication via Slack notifications.
5th LF Energy Power Grid Model Meet-up SlidesDanBrown980551
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5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power gridβs behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
-An update on the latest advancements in Power Grid -Model technology during the first and second quarters of 2024.
-An interactive brainstorming session to discuss and propose new feature requests.
-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
This presentation provides valuable insights into effective cost-saving techniques on AWS. Learn how to optimize your AWS resources by rightsizing, increasing elasticity, picking the right storage class, and choosing the best pricing model. Additionally, discover essential governance mechanisms to ensure continuous cost efficiency. Whether you are new to AWS or an experienced user, this presentation provides clear and practical tips to help you reduce your cloud costs and get the most out of your budget.
Ivantiβs Patch Tuesday breakdown goes beyond patching your applications and brings you the intelligence and guidance needed to prioritize where to focus your attention first. Catch early analysis on our Ivanti blog, then join industry expert Chris Goettl for the Patch Tuesday Webinar Event. There weβll do a deep dive into each of the bulletins and give guidance on the risks associated with the newly-identified vulnerabilities.
TrustArc Webinar - 2024 Global Privacy SurveyTrustArc
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How does your privacy program stack up against your peers? What challenges are privacy teams tackling and prioritizing in 2024?
In the fifth annual Global Privacy Benchmarks Survey, we asked over 1,800 global privacy professionals and business executives to share their perspectives on the current state of privacy inside and outside of their organizations. This yearβs report focused on emerging areas of importance for privacy and compliance professionals, including considerations and implications of Artificial Intelligence (AI) technologies, building brand trust, and different approaches for achieving higher privacy competence scores.
See how organizational priorities and strategic approaches to data security and privacy are evolving around the globe.
This webinar will review:
- The top 10 privacy insights from the fifth annual Global Privacy Benchmarks Survey
- The top challenges for privacy leaders, practitioners, and organizations in 2024
- Key themes to consider in developing and maintaining your privacy program
Taking AI to the Next Level in Manufacturing.pdfssuserfac0301
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Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
Boosting the Performance of Nested Spatial Mapping with Unequal Modulation in 802.11n
1. GCT Semiconductor, Inc.http://www.gctsemi.com
Boosting the Performance of Nested Spatial Mapping
with Unequal Modulation in 802.11n
Ealwan Lee
GCT Semiconductor, Inc.
Session : WLAN, WPAN and WBAN (P-2)
Oct 18, 2018 (08:30 ~ 10:10)
2. 1/15
GCT Semiconductor, Inc.ICTC 2018
Table of Contents
ο± Introduction (p. 2)
ο΅ History & Background
β Hierarchical Modulation, LDM(ATSC-3.0), NOMA
β Higher order modulation, MIMO
ο΅ Review of prior works of Nested Spatial Mapping and Overview of this work
β 256-QAM with Nested Spatial Mapping (IP-SOC 2016)
ο± Generalization, extension and improvement of prior arts (pp. 3 ~ 11)
ο΅ Unequal modulation (pp. 3 ~ 8)
β 64QAM+QPSK for improved 256-QAM
β 64QAM+16QAM for spoofing of 1024-QAM introduced in 802.11ax
ο΅ Improvement of channel estimator (p. 9)
ο΅ Balancing the LLR of SIC demapper between the two streams (pp. 10 ~ 11)
ο± Application (pp. 12 ~ 14)
ο΅ AMC
ο΅ Backward compatibility with 802.11n.
ο΅ Revision points in F/W for its adoption
ο± Conclusion (p. 15)
3. 2/15
GCT Semiconductor, Inc.ICTC 2018
1. Introduction : Background & History
ο± Prior works related with Nested Spatial Mapping - But, not the same.
ο΅ Hierarchical Modulation in Next-Gen Broadcasting System : LDM in ATSC-3.0
β Respective channel encoder per stream(higher/lower priority)
β UMB, NOMA in cellular wireless network.
β Modulation of low layer is dependent on the state of upper layer modulator.
ο΅ Modulation order increases
β 256-QAM in 802.11ac and LTE-A
β 1024-QAM in 802.11ax since the publication of Nested Spatial Mapping in 2016.
ο΅ Multiple antenna device is not preferred in recently emerging IoT connectivity solution.
β Bulky volume, Large power consumption, High implementation cost
ο± Initial works of Nested Spatial Mapping (Prior works of the author)
ο΅ Tx/Rx of dual 16-QAM stream from a single channel encoder through a single physical antenna.
ο΅ Maximal exploitation of 802.11n standard to raise the effective modulation order.
802.11ac
802.11n
802.11ax
256-QAM
1024-QAM
Hierarchical Modulation
Unequal
Modulation
Performance boosting
of 256-QAM
Nested
Spatial Mapping
4. 3/15
GCT Semiconductor, Inc.ICTC 2018
2.1. Generalization of Nested Spatial Mapping
ο± In UEQM of 802.11
ο΅ Higher order is placed before the lower order with equal RMS power to each antenna.
ο΅ In Nested Spatial Mapping,
β (c=0) : High power is assigned to the higher order modulation(1st stream)
β (c=1) : High power is assigned to the lower order modulation(2nd stream)
ο± Normalization of the composite signal is carried out for fair comparison.
IFFT DAC+
IFFT DAC
~
X
X
RF-PLL
s2-c[n]
s1+c[n]
y(t)
GI
GI
FLT
FLT
0ns
-400 ns
x1+c[n]
X πΆ π π+π,π πβπ
βπ
=
π² π π+π
π² π πβπ
β
πβπ πβπ
π + πΉ π π+π,π πβπ
CSD
CSD
X
π π π+π,π πβπ
= ΰ΅πΆ π π+π,π πβπ
π + πΆ π π+π,π πβπ
π
CC
enc
bn
π π+π π = π π π+π,π πβπ
β π π+π π + πΆ π π+π,π πβπ
βπ
β π πβπ π
MCS 1st
QAM
2nd
QAM
12(2,2) 16 16
36(2,1) 16 4
37(3,1) 64 4
38(3,3) 64 16
c=0
c=1
8. 7/15
GCT Semiconductor, Inc.ICTC 2018
3.2. Spoofing of 1024-QAM comparable to 802.11ax
ο± Application of Unequal Modulation : MCS38(16QAM+64QAM, 64QAM+16QAM)
ο΅ SNR = 37 dB.
ο± c = 0 is recommended for spoofing of 1024-QAM.
ο΅ Possibly limited by unknown impairment of the data path optimized for 802.11n as of today.
0 6 12 18 24 30
10
-3
10
-2
10
-1
10
0
nesting factor, 20 ο log am
1
,m
2
(dB)
BLER(%)
MCS38(c=1)
MCS38(c=0)
πΉ π,π
π π β
π² π
π² π
πΉ π,π
π π β
π² π
π² π
23
β
πΎ3
πΎ2
< 22
< 23
< 22
β
πΎ2
πΎ3
Nominal Nesting Factor
Nesting Margin
π
2 β 3 + π β 2
<
π
2 β 2 + π β 2
Optimal Nesting Factor = Nominal Nesting Factor
+
Nesting Margin
9. 8/15
GCT Semiconductor, Inc.ICTC 2018
3.3. Operating range : (SNR, Nesting Factor)
ο± Around the required Tx EVM(~SNR), the operating range is wide enough
ο΅ Condition : 100+ Mbps
ο΅ State-of-the-art technology ascertains the Tx EVM above 40 dB as of today.
nesting factor, 20 ο log a3,2
(dB)
SNR(dB)
15 18 24 30
30
36
42
48
10
20
30
40
50
60
70
80
90
100
Colormapforthroughput(Mbps)
p. 12
p. 7
Excerpt from p. 556 of [3] in the paper
10. 9/15
GCT Semiconductor, Inc.ICTC 2018
4.1. Refined Channel estimate for Nested Spatial Mapping
ο± Exploit the fact that
ο΅ βπ2 = πΌ π1,π2
β βπ1
ο± Strategy for synchronizing the value of nesting factor over the link
ο΅ Simply fix it based on the MCS selected!
β The optimal performance is insensitive to the variation of nesting margin
ο΅ Estimate by summing over the channel estimate.
β Adaptive control of nesting margin with discrete step can be applied if needed.
ΰ·¨βπ1[π] β
1 β βπ1[π] + ΰ·πΌ π1,π2
β βπ2[π]
1 + ΰ·πΌ π1,π2
2
ΰ·¨βπ2[π] β ΰ·πΌ π1,π2
β ΰ·¨βπ1[π]
πΎ =
Ο π=1
π π π
βπ2
β
[π] β βπ2[π]
Ο π=1
ππ π
βπ1
β
[π] β βπ1[π] + βπ2
β
[π] β βπ2[π] ΰ·πΌ π1,π2
=
π π(πΎ)
1 β π π(πΎ)
i is index for receiver path.
Multiple Receiver chain serves only to MRC.
frequency(n)
βπ1[π]
βπ2[π]
πΌ π1,π2
β ΰ·πΌ π1,π2
πΌ π1,π2
11. 10/15
GCT Semiconductor, Inc.ICTC 2018
4.2. SIC demapper (1/2) : Balancing of LLR between streams
ο± SIC demapper can be used in replace of ML demapper.
ο΅ Linear de-correlation type receiver such as ZF, MMSE cannot decode NSM(rank = 1)
ο± c, ordering info of SIC demapper, can be detected with the sign of β1 β β2 .
ο΅ In Tx side, c is fixed to a specific value.
ο± Double-check and re-adjust of the LLR for the balancing between the two streams.
ο΅ Each BICM demapper output should be independent of πΎ π.
ο΅ Or the output should be re-adjusted by following re-scaler(addressed in the paper).
BICM
demapper
X
π π+π
β
πΉ[π]
+ X
π πβπ
β
= πΆ π π+π,π πβπ
βπ
β π π+π
βπΉ[π] β π π+π β ΰ·π π+π[π]
Xπ π+π
BICM
demapper
ΰ·π π+π[π]
ΰ·π πβπ[π]
X
π π[π]
π π[π]
π· π π+π,π πβπ
βπ
= π² π πβπ
/π² π π+π
To channel decoder
π² π π+π
β π π+π[π]
π
π = π π > π π ? π: π
π π
+
-
π π
π² π π+π
β π π+π
π
Errata in the paper corrected !
π² π πβπ
β π πβπ
π
BICM
demapper
X
π π+π
β
/π² π π+π
π π+π
π
ΰ·π π+π[π]
π π+π[π]
12. 11/15
GCT Semiconductor, Inc.ICTC 2018
4.2. SIC demapper (2/2) : Comparison with ML demapper
ο± No need for the concern about the balancing or re-adjust of prior works : EQM(MCS12)
ο΅ π½2,2 = ΰ΅πΎ2
πΎ2
= 1
ο± Balanced LLR or re-adjustment of LLR for given SNR reduces
ο΅ the performance gap with ML demapper.
0 6 12 18 24 30
10
-3
10
-2
10
-1
10
0
nesting factor, 20 ο log am
1+c
,m
2-c
(dB)
BLER(%)
MCS37,MLD(c=1)
MCS37,SIC(c=1)
MCS12,MLD
MCS12,SIC
MCS38,MLD(c=0)
MCS38,SIC(c=0)
SNR = 28dB for 256-QAM
SNR = 37dB for 1024-QAM
π· π,π =
π² π
π² π
π· π,π =
π² π
π² π
π·π,π = π
Errata in the paper corrected !
N.B.
The performance gap of MCS37(c=1)
with ML demapper is much narrower
than that of MCS12.
13. 12/15
GCT Semiconductor, Inc.ICTC 2018
5.1. Throughput vs. SNR curve for AMC in Boosting Region
ο± 256-QAM
ο΅ Optimized MCS37(QPSK+64QAM) outperforms MCS12(16QAM+16QAM) approximately by 1dB.
ο± PER estimate based on ACK packet can be used for AMC even for 1024-QAM region.
ο΅ ο₯-greedy algorithm may be used to raise the modulation order.
12 18 24 30 36 42
0
20
40
60
80
100
120
SNR (dB)
Throughput(Mbps)
MCS6
MCS7
MCS37
MCS38
MCS12
MCS36
MCS38
MCS37
MCS12
MCS07
π· π > π β
π»π· ππ
π»π· ππ
π· π > π β
π»π· ππ
π»π· ππ
π· π < π½
π· π < π½
14. 13/15
GCT Semiconductor, Inc.ICTC 2018
5.2. Backward compatibility with existing 802.11n AP
ο± The format of the OFDM symbol has been modified in 802.11ax
ο΅ 64-pts FFT(52/56, 3.2us) => 256-pts FFT(234/242, 12.8 us)
ο΅ The ratio of shortest guard interval has been reduced from 1/8(0.4 us) to 1/16(0.8 us).
ο± Nested Spatial Mapping is not exclusive to the use of either 802.11ac or 802.11ax
ο΅ It affects and improves 802.11n part only.
Rx
Tx
Wi-Fi 5
(1x1)
Wi-Fi 6
(1x1)
Proposed Wi-Fi 4
2x2EQM UEQM
802.11ac
(1x1)
86.7 86.7 72.2 72.2 72.2
802.11ax
(1x1)
86.7 143.4 72.2 72.2 72.2
NSM
EQM 72.2 72.2 86.7 86.7 86.7
UEQM 72.2 72.2 86.7 108.3 108.3
802.11n
(2x2)
72.2 72.2 72.2 72.2 144.4
256-QAM
1024-QAM
256-QAM
1024-QAM
2x2 64-QAM
Assume
ML demapperhttps://www.wi-fi.org/news-events/newsroom/wi-fi-alliance-introduces-wi-fi-6
Announcement
from wi-fi.org
on [2018-10-03]
Wi-Fi 5 =
Wi-Fi 4 + NSM
Wi-Fi 5 <<
Wi-Fi 4 + NSM
+ UEQM
< Wi-Fi 6
ZF (x)
MMSE (x)
15. 14/15
GCT Semiconductor, Inc.ICTC 2018
5.3. Revision point for indicating NSM functionality
ο± Rx features
ο΅ Rx MCS Bitmask is kept disable not to activate the legacy 2-stream Tx.
ο΅ Raise the value of B[89:80] to a proper value such as 86 or 108.
β No side effect to the legacy 802.11n device.
ο± Tx features
ο΅ B[96] = 1βb1, B[97] = 1βb1, B[99:98] = 2βb01
ο΅ B[100] = 1βb1 if UEQM is enabled.
ο± No other Out-of-Band information exchange is required.
B[89:80] = 86 > 72 ~ 256-QAM
B[99:98] = 2βb01
1βb0 :
16QAM+16QAM (MCS12)
1βb1 :
16QAM+QPSK (MCS36)
64QAM+QPSK (MCS37)
64QAM+16QAM(MCS38)
B[89:80] = 108 > 72 ~ 1024-QAM
Excerpt from p. 944 of [1] in the paper
16. 15/15
GCT Semiconductor, Inc.ICTC 2018
6. Conclusion
ο± Nested Spatial Mapping can be improved with Unequal Modulation of 802.11n
ο΅ UEQM is available only in 802.11n specification.
β No UEQM defined in 802.11ac and 802.11ax specification.
ο΅ Required SNR of 256-QAM equivalent modulation has been decreased by 1dB
β MCS12(16QAM+16QAM) => MCS37(QPSK+64QAM)
ο΅ 1024-QAM equivalent modulation is available with MCS38(64QAM+16QAM)
β No need to adopt 802.11ax only to achieve 108 Mbps with 20MHz band-width.
ο 50% increase over 64-QAM of 802.11n, 25% increase over 256-QAM of 802.11ac
ο± Closed-form Analysis of Optimal Nesting Margin
ο΅ Clarification of the nominal nesting factor for UEQM
β No power-of-two in case of UEQM.
ο΅ Performance variation is insensitive to the nesting margin even in UEQM.
ο± Recipes shared for efficient hardware implementation
ο΅ Refinement of the channel estimate exploiting the channel condition of rank=1.
ο΅ SIC demapper
β Double-check/Re-adjust of soft demapper output(LLR) narrows the performance gap with ML demapper.