OFDM Massive MIMO Matlab Projects Research Ideas
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Fundamental Procedures of OFDM Project OFDM Multiple I&O under PAPR Moderation Estimate in OFDM-MIMO MIMO under Matlab
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PAPR Reduction in OFDM
The document discusses a method for reducing peak-to-average power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) systems using compandors. It proposes using a new class of compandors with an approximation of the nonlinear optimal compression function using first-degree spline functions to reduce complexity. Simulation results showed that using the suggested compandor model in an OFDM system improves performance by reducing PAPR.
Code matlab mô phỏng dung lượng kênh truy ền reyleght trong kĩ thuật mimo
This MATLAB code simulates the channel capacity of a MIMO (Multiple Input Multiple Output) Rayleigh fading channel with varying numbers of transmit and receive antennas. It generates random channel matrices with Rayleigh distributed elements, performs SVD decomposition, allocates power using waterfilling algorithm, and calculates channel capacity over different SNR values. The code plots the average channel capacity versus SNR for each configuration, and the PDF of elements in the diagonal matrix obtained from SVD decomposition.
MATLAB MIMO Toolbox Projects Research Topics
Foremost Toolbox in MIMO Matlab Projects
MIMO Toolbox Features
Topmost Areas in MATLAB MIMO Toolbox Projects
559 22-33
Filter Bank-based Multicarrier Modulation (FBMC) using Offset Quadrature
Amplitude Modulation (OQAM), known as FBMC/OQAM (or OFDM/OQAM), provides an
attractive alternative to the conventional Cyclic Prefix-Based Orthogonal Frequency
Division Multiplexing (CP-OFDM), especially in terms of increased robustness to frequency
offset and Doppler spread, and high bandwidth efficiency. It suffers, however, from an
inherent (intrinsic) imaginary Intercarrier/Inter-symbol interference that complicates signal
processing tasks such as Channel Estimation (CE). Recently, the so-called Interference
Approximation Method (IAM) was proposed for preamble-based CE. It relies on the
knowledge of the pilot's neighbourhood to approximate this interference and constructively
exploit it in simplifying CE and improving its performance. The IAM preamble with nulls at
the neigh boring time instants and extended version of it, which can provide significant
improvement through an appropriate exploitation of the interfering symbols from
neighbouring time instants that results in CE performance was recently reported. In this
paper, we present IAM preamble design and apply it to identify the optimal IAM preamble
sequence which results in a higher gain. Numerical results have verified the effectiveness of
the theoretical framework and a gain of 1.24 dB against E-IAM-C.
A blind channel shortening for multiuser, multicarrier CDMA system over multi...
In this paper we derive the Multicarrier Equalization by Restoration of Redundancy (MERRY) algorithm: A blind, adaptive channel shortening algorithm for updating a Time-domain Equalizer (TEQ) in a system employing MultiCarrier Code Division Multiple Access (MC-CDMA) modulation. We show that the MERRY algorithm applied to the MC-CDMA system converges considerably more rapidly than in the Orthogonal Frequency Division Multiplexing (OFDM) system [1]. Simulations results are provided to demonstrate the performance of the algorithm.
Mat lab for bplc
The document describes using MATLAB to simulate and analyze the transfer function of a powerline channel between two access points. It obtains the attenuation in signal strength versus frequency and phase distortion versus frequency. It then calculates the impulse response of the powerline channel by taking the inverse Fourier transform of the transfer function.
Wat question papers
Sectorizing an omnidirectional site can increase capacity while maintaining similar interference levels.
For a propagation exponent of n=4:
- The reuse factor RCS' can be increased to ~7
- Traffic channels per sector increase from 24 to ~40
- Total Erlang capacity increases from 6.16 to 23.2
For a propagation exponent of n=3:
- RCS' can be increased to ~5.7
- Traffic channels per sector increase from 24 to ~50
- Total Erlang capacity increases more, from 16.6 to 29.4 Erlangs
The capacity gain is higher for n=3 because path loss increases more
IRJET- Structured Compression Sensing Method for Massive MIMO-OFDM Systems
The document presents a structured compression sensing method for massive MIMO-OFDM systems called Priori information-assisted adaptive structured subspace pursuit (PA-ASSP) algorithm. PA-ASSP aims to improve channel estimation accuracy with reduced complexity compared to existing algorithms like adaptive structured subspace pursuit (ASSP). It initializes channel estimation using prior information and exploits common sparsity of MIMO channels across OFDM symbols. Simulation results show PA-ASSP achieves better bit error rate and normalized mean square error performance than ASSP and other algorithms under different SNR levels.
Recommended
PAPR Reduction in OFDM
The document discusses a method for reducing peak-to-average power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) systems using compandors. It proposes using a new class of compandors with an approximation of the nonlinear optimal compression function using first-degree spline functions to reduce complexity. Simulation results showed that using the suggested compandor model in an OFDM system improves performance by reducing PAPR.
Code matlab mô phỏng dung lượng kênh truy ền reyleght trong kĩ thuật mimo
This MATLAB code simulates the channel capacity of a MIMO (Multiple Input Multiple Output) Rayleigh fading channel with varying numbers of transmit and receive antennas. It generates random channel matrices with Rayleigh distributed elements, performs SVD decomposition, allocates power using waterfilling algorithm, and calculates channel capacity over different SNR values. The code plots the average channel capacity versus SNR for each configuration, and the PDF of elements in the diagonal matrix obtained from SVD decomposition.
MATLAB MIMO Toolbox Projects Research Topics
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Filter Bank-based Multicarrier Modulation (FBMC) using Offset Quadrature
Amplitude Modulation (OQAM), known as FBMC/OQAM (or OFDM/OQAM), provides an
attractive alternative to the conventional Cyclic Prefix-Based Orthogonal Frequency
Division Multiplexing (CP-OFDM), especially in terms of increased robustness to frequency
offset and Doppler spread, and high bandwidth efficiency. It suffers, however, from an
inherent (intrinsic) imaginary Intercarrier/Inter-symbol interference that complicates signal
processing tasks such as Channel Estimation (CE). Recently, the so-called Interference
Approximation Method (IAM) was proposed for preamble-based CE. It relies on the
knowledge of the pilot's neighbourhood to approximate this interference and constructively
exploit it in simplifying CE and improving its performance. The IAM preamble with nulls at
the neigh boring time instants and extended version of it, which can provide significant
improvement through an appropriate exploitation of the interfering symbols from
neighbouring time instants that results in CE performance was recently reported. In this
paper, we present IAM preamble design and apply it to identify the optimal IAM preamble
sequence which results in a higher gain. Numerical results have verified the effectiveness of
the theoretical framework and a gain of 1.24 dB against E-IAM-C.
A blind channel shortening for multiuser, multicarrier CDMA system over multi...
In this paper we derive the Multicarrier Equalization by Restoration of Redundancy (MERRY) algorithm: A blind, adaptive channel shortening algorithm for updating a Time-domain Equalizer (TEQ) in a system employing MultiCarrier Code Division Multiple Access (MC-CDMA) modulation. We show that the MERRY algorithm applied to the MC-CDMA system converges considerably more rapidly than in the Orthogonal Frequency Division Multiplexing (OFDM) system [1]. Simulations results are provided to demonstrate the performance of the algorithm.
Mat lab for bplc
The document describes using MATLAB to simulate and analyze the transfer function of a powerline channel between two access points. It obtains the attenuation in signal strength versus frequency and phase distortion versus frequency. It then calculates the impulse response of the powerline channel by taking the inverse Fourier transform of the transfer function.
Wat question papers
Sectorizing an omnidirectional site can increase capacity while maintaining similar interference levels.
For a propagation exponent of n=4:
- The reuse factor RCS' can be increased to ~7
- Traffic channels per sector increase from 24 to ~40
- Total Erlang capacity increases from 6.16 to 23.2
For a propagation exponent of n=3:
- RCS' can be increased to ~5.7
- Traffic channels per sector increase from 24 to ~50
- Total Erlang capacity increases more, from 16.6 to 29.4 Erlangs
The capacity gain is higher for n=3 because path loss increases more
IRJET- Structured Compression Sensing Method for Massive MIMO-OFDM Systems
The document presents a structured compression sensing method for massive MIMO-OFDM systems called Priori information-assisted adaptive structured subspace pursuit (PA-ASSP) algorithm. PA-ASSP aims to improve channel estimation accuracy with reduced complexity compared to existing algorithms like adaptive structured subspace pursuit (ASSP). It initializes channel estimation using prior information and exploits common sparsity of MIMO channels across OFDM symbols. Simulation results show PA-ASSP achieves better bit error rate and normalized mean square error performance than ASSP and other algorithms under different SNR levels.
R.Selvakumar
This document discusses reducing peak-to-average power ratio (PAPR) in MIMO-OFDM systems using linear companding transforms. It proposes applying companding transforms like linear companding transform (LCT) and linear nonsymmetrical companding transform (LNST) to reduce PAPR without restricting system parameters. The method aims to achieve a very low PAPR, reduce signal degradation from nonlinear power amplifiers, and have high spectral efficiency and signal-to-noise ratio while staying within bandwidth and complexity limits. The performance is analyzed through MATLAB simulations.
Research paper (channel_estimation)
The document proposes a new channel estimation algorithm called ICEA-DA for MIMO-OFDM systems. ICEA-DA uses least squares estimation with discrete Fourier transform and integrates it with a differential evolution technique. It is placed at the central part of the MIMO-OFDM system between the transmitter and receiver blocks. The proposed method is evaluated for a 2x4 MIMO system using QPSK modulation. Results show ICEA-DA provides better performance than existing techniques in terms of bit error rate, peak signal-to-noise ratio, channel capacity, and symbol error rate.
IRJET- Survey Paper on Paper Reduction for MIMO-OFDM Systems using PTS Scheme
This document summarizes research on techniques to reduce peak-to-average power ratio (PAPR) in MIMO-OFDM systems. It discusses how PAPR significantly affects OFDM and can cause nonlinearity in high power amplifiers. The paper focuses on using partial transmit sequence techniques to reduce PAPR. It reviews related work applying techniques like iterative clipping and filtering, partial transmit sequences, and adaptive selected mapping to reduce PAPR. The document also discusses system models for MIMO-OFDM and analyzing PAPR reduction performance.
Performance of Multiple symbol representation with clipping scheme for PAPR r...
OFDM is one of the multicarrier modulation technique used in various communication systems. The major problem one faces while implementing this system is the high peak to average power .For an efficient OFDM system this PAPR should be low. In this paper a hybrid PAPR (peak to average power ratio) reduction technique for the OFDM (orthogonal frequency division multiplexing) signal which combines a multiple symbol representations method with a signal clipping method is proposed. In multiple symbol representations alternative signaling points are used to represent one symbol and PAPR is further reduced with the clipping scheme. The performance of the hybrid scheme is compared with the partial transmit sequence which is one of the other PAPR reduction scheme. In partial transmit sequence the input data is divided in to disjoint blocks transformed in to time domain sequence and rotated by phase factors. Theoretical analysis and simulation results validate that the proposed scheme has the ability to provide large PAPR reduction, low bit error rate. Performance analysis is also done with the partial transmit sequence scheme.
Enhancing PAPR reduction for FBMC-OQAM systems by joint both tone reservation...
As all multi-carrier designs FBMC-OQAM signal suffers from large peak-toaverage power ratio (PAPR). There are divers PAPR reduction methods to
solve this problem. Tone reservation (TR) scheme is one of the most famous
PAPR reduction techniques in which a peak cancelling signal is added to the
original one in such a way that PAPR will reduce. Companding is another
easy PAPR reduction technique in which compression of large amplitude
samples and expansion of low one. In this paper, we suggest a new PAPR
reduction scheme called TR&Compd, based on combining tone reservation
and Mu-law companding techniques for FBMC-OQAM systems. The
simulation results show that the new proposed scheme (TR&Compd)
presents better results in term of PAPR reduction compared to TR and Mulaw companding methods taken separately.
Minimization Of Inter Symbol Interference Based Error in OFDM System Using A...
Minimization Of Inter Symbol Interference Based Error in
OFDM System Using Adaptive Decision Mechanism by SNR
Estimation
Peak to Average Power Ratio Reduction in Mc Cdma System by Using Pulse Shapin...
Abstract: One of the drawback of multicarrier code division multiple access (MC CDMA) is the high peak to
average power ratio (PAPR). In this paper A novel scheme based on pulse shaping described for PAPR
reduction. Here three different pulse shaping filters (Raised cosine, Sinc power pulse and Nyqist pulse) are
described for PAPR reduction in MC CDMA system. The method is based on the proper selection of the pulses
for shaping the different sub carriers of the MC CDMA modulation scheme. It is shown by computer simulation
that the scheme achieves the significant improvement in PAPR reduction in MC CDMA system. Its
implementation complexity is much low in comparison to the previous published methods. Thus pulse shaping
technique can be used not only to shape the spectrum of the transmitted signal but also to reduce its PAPR. In
computer simulation It is observed that by using nyquist pulse near about 6.8 db PAPR is obtained. Which is
considerable PAPR reduction than a PAPR value of Original MC CDMA signal
Keywords: MC CDMA, PAPR, PULSE SHAPING, BPSK
SIDELOBE SUPPRESSION AND PAPR REDUCTION FOR COGNITIVE RADIO MIMO-OFDM SYSTEMS...
Orthogonal Frequency Division Multiplexing (OFDM) is deployed to overcome the interference. However, OFDM has a relatively large OOB emissions. In spectrum sharing approaches such as dynamic spectrum access networks, the OOB power levels of secondary transmissions should be kept below a certain level, in order not to interfere with primary transmissions. . The difficulties such as sidelobes and PAPR caused by OFDM is reduced by convex optimization and PTS technique respectively. In this technique each OFDM subcarrier is multiplied with a real-valued weight that is determined in order not to interfere with adjacent users. The problem with the SW technique is involving a very complex optimization. We propose a heuristic approach called convex optimization. It can achieve considerable sidelobe suppression while requiring significantly less computational resources than the optimal solution. Implementation results prove that it can be introduced for real-time transmissions. Optimizing the subcarrier weights and SINR is complex, for which we use the technique of convex optimization. For reducing the PAPR we use Partial Transmit Sequence (PTS) technique.
Sidelobe suppression and papr
Orthogonal Frequency Division Multiplexing (OFDM) is deployed to overcome the interference. However,
OFDM has a relatively large OOB emissions. In spectrum sharing approaches such as dynamic spectrum
access networks, the OOB power levels of secondary transmissions should be kept below a certain level, in
order not to interfere with primary transmissions. . The difficulties such as sidelobes and PAPR caused by
OFDM is reduced by convex optimization and PTS technique respectively. In this technique each OFDM
subcarrier is multiplied with a real-valued weight that is determined in order not to interfere with adjacent
users. The problem with the SW technique is involving a very complex optimization. We propose a heuristic
approach called convex optimization. It can achieve considerable sidelobe suppression while requiring
significantly less computational resources than the optimal solution. Implementation results prove that it
can be introduced for real-time transmissions. Optimizing the subcarrier weights and SINR is complex, for
which we use the technique of convex optimization. For reducing the PAPR we use Partial Transmit
Sequence (PTS) technique.
Index terms : OFDM (Orthogonal Frequency Division Multiplexing), PAPR (Peak Average Power
Ratio), OOB (Out Of Band), IFFT (Inverse Fast Fourier Transform).
MIMO OFDM
This presentation makes note of different techniques present with respect to MIMO OFDM and which can be implemented to improve the wireless system.
I010336469
This document discusses reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) signals using selective mapping (SLM) technique. It begins with an introduction to OFDM and the PAPR problem. It then discusses channel coding techniques like Reed Solomon codes, convolution codes and Hamming codes that can be used for PAPR reduction. The selective mapping technique is described as generating multiple candidate signals representing the same information and selecting the one with the lowest PAPR for transmission. Simulation results show SLM provides better PAPR reduction when used with Hamming coded OFDM compared to Reed Solomon and convolution coded OFDM. The document concludes SLM is an effective technique for P
Mohammed Moneim M.Tech ppt
This document summarizes several papers on techniques for reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. The papers discuss using techniques like partial transmit sequence (PTS), companding transforms, cross entropy methods, and weighted OFDM signals to reduce PAPR without significantly impacting bit error rate or requiring additional processing at the receiver. Simulation results show these techniques can provide PAPR reduction close to exhaustive search methods while maintaining lower complexity.
MIMO-OFDM for 4G network
It is fully based on MIMO-OFDM technique for 4G netork to find out the BER & Capacity in wireless communication system.
Ofdm-cpm Ber Performance and FOBP Under IEEE802.16 Scenario
This document discusses the performance of OFDM-CPM (orthogonal frequency division multiplexing-continuous phase modulation) under IEEE 802.16 scenarios. It shows that OFDM-CPM can exploit frequency diversity in multipath channels unlike conventional OFDM. Simulation results over multipath Stanford University Interim channel models show that OFDM-CPM with an MMSE equalizer outperforms Rayleigh fading channels by exploiting multipath diversity. The document also compares the spectral properties and bit error rate performance of OFDM-CPM to conventional OFDM.
Design and Hardware Implementation of Low-Complexity Multiuser Precoders (ETH...
Design and Hardware Implementation of Low-Complexity Multiuser Precoders (ETH...TSC University of Mondragon
Presentation on the design and FPGA implementation of low-complexity multiuser vector precoders, given at ETHZ Zurich in October 2010New scheme for PAPR reduction in FBMC-OQAM systems based on combining TR and ...
This paper proposes a new hybrid technique called TR&DC that combines tone reservation (TR) and deep clipping (DC) to reduce the peak-to-average power ratio (PAPR) in filter bank multi-carrier with offset quadrature amplitude modulation (FBMC-OQAM) systems. The TR&DC scheme first applies the TR method to the FBMC-OQAM signal, then performs deep clipping on the resulting signal to further reduce any remaining high peaks. Simulation results show the TR&DC approach provides better PAPR reduction than TR alone, reducing the PAPR from 10.1 dB for the original signal to 7.2 dB, a gain of around 2.9 dB. The performance is not
Optimized OFDM Model Using CMA Channel Equalization for BER Evaluation
Orthogonal Frequency Division Multiplexing (OFDM) is a type of Multicarrier Modulation (MCM) technique in which entire bandwidth is divided into large number of small sub-carriers and each subcarrier is transmitted parallel to achieve higher data rates. It has various applications like Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB) and wireless LAN.OFDM technique is widely used in wireless communication system because of its very high data rate. The performance of FFT based OFDM system using Linear and cyclic channel coding and Constant Modulus Algorithm (CMA) equalizer is simulated using simulink model. The BER saving using the optimized proposed model with both linear and cyclic channel coding along with CMA equalizer is evaluated. The proposed work using cyclic channel coding with QPSK/QAM modulation and CMA as channel equalization under AWGN channel results in 52.6% and 96.3% BER reduction as compared to conventional OFDM model without channel coding, channel equalization and channel fading. So, CMA equalizer is used to enhance the performance of OFDM system.
EFFİCİENT PAPR REDUCTİON APPROACH FOR SELECTİVE MAPPİNG İN A STBC MIMO-OFDM S...
The demand for wireless communication increases every day. MIMO system increases the channel capacity
without increasing the bandwidth. OFDM eliminates inter-symbol interference very effectively. By
combining both these technologies ,the resultant data rates are increased and also robustness to multi path
fading effects. But the main drawback of MIMO-OFDM system is its high PAPR. Selective mapping(SLM)
is one of the popular distortion less technique for reducing high PAPR but the computational complexity
for searching optimum phase factors is high. Many evolutionary algorithms like particle swarm
optimisation, artificial bee colony optimization algorithm, cuckoo search algorithm are proposed for
searching optimum phase factors. In this paper two new optimization algorithms social spider
optimization(SSO), adaptive artificial bee colony algorithm are proposed for SLM and Simulation results
shows that compared to adaptive artifctial bee colony algorithm, social spider optimization algorithm(SSO)
gives best phase factors for lower PAPR with fewer number of iterations and also reduces the
computational complexity of SLM technique very efficiently.
B033206014
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Pwm technique to overcome the effect of
Many current communication systems suffer from performance degradation due to the high sensitivity to
high power peaks especially in the nonlinear devices. The author introduces a new concept based on the
Pulse Width Modulation (PWM), namely MIMO-OFDM system based PWM (MO-PWM) to overcome this
deficiency. Here, the peak-to-average power ratio (PAPR) problem in Orthogonal Frequency Division
Multiplexing (OFDM) technique is used as a criterion to check the validity of the proposed work.
Moreover, the proposed system work has been implemented over Field Programmable Gate Array (FPGA),
which is designed to characterize both of the complexity and the speed issues.
The systems performance based MO-PWM and validity have been checked based on a numerical analysis
and a conducted simulation. The simulation results show that the MO-PWM can clearly reduce the PAPR
values nevertheless the used OFDM systems’ specifications, and gives a promising results over some
techniques found in the literature, such as clipping, SLM and PTS under same bandwidth occupancy and
system’s specifications.
WiFi Network Simulator Projects Research Guidance
This document discusses WiFi network simulator projects and tools. It lists several popular network simulators like NS-3, OPNET, Omnet++ and Qualnet that can be used for WiFi network simulation projects in MATLAB. It then provides examples of recent research topics conducted using WiFi network simulators, including energy efficient load balancing between LTE and WiFi networks and jamming-resistant frequency hopping in cognitive WiFi networks. Finally, it outlines some channel estimation models used in WiFi network simulator projects, such as energy optimization with delay sensitive traffic and transmit power adaptation in WiFi mesh networks for rescue operations.
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This document discusses different types of network simulators that can be used in MATLAB. It lists several open-source simulators like NS-2, NS-3, Omnet++ and proprietary simulators like Qualnet and Opnet. It also mentions some current research projects using network simulation in areas like supercomputer networks, isolated power systems, rumor routing protocols and wireless applications. Finally, it provides examples of modern research topics involving areas like smart grids, mobile network simulation, caching systems and taxi dispatching.
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Similar to OFDM Massive MIMO Matlab Projects Research Ideas
R.Selvakumar
This document discusses reducing peak-to-average power ratio (PAPR) in MIMO-OFDM systems using linear companding transforms. It proposes applying companding transforms like linear companding transform (LCT) and linear nonsymmetrical companding transform (LNST) to reduce PAPR without restricting system parameters. The method aims to achieve a very low PAPR, reduce signal degradation from nonlinear power amplifiers, and have high spectral efficiency and signal-to-noise ratio while staying within bandwidth and complexity limits. The performance is analyzed through MATLAB simulations.
Research paper (channel_estimation)
The document proposes a new channel estimation algorithm called ICEA-DA for MIMO-OFDM systems. ICEA-DA uses least squares estimation with discrete Fourier transform and integrates it with a differential evolution technique. It is placed at the central part of the MIMO-OFDM system between the transmitter and receiver blocks. The proposed method is evaluated for a 2x4 MIMO system using QPSK modulation. Results show ICEA-DA provides better performance than existing techniques in terms of bit error rate, peak signal-to-noise ratio, channel capacity, and symbol error rate.
IRJET- Survey Paper on Paper Reduction for MIMO-OFDM Systems using PTS Scheme
This document summarizes research on techniques to reduce peak-to-average power ratio (PAPR) in MIMO-OFDM systems. It discusses how PAPR significantly affects OFDM and can cause nonlinearity in high power amplifiers. The paper focuses on using partial transmit sequence techniques to reduce PAPR. It reviews related work applying techniques like iterative clipping and filtering, partial transmit sequences, and adaptive selected mapping to reduce PAPR. The document also discusses system models for MIMO-OFDM and analyzing PAPR reduction performance.
Performance of Multiple symbol representation with clipping scheme for PAPR r...
OFDM is one of the multicarrier modulation technique used in various communication systems. The major problem one faces while implementing this system is the high peak to average power .For an efficient OFDM system this PAPR should be low. In this paper a hybrid PAPR (peak to average power ratio) reduction technique for the OFDM (orthogonal frequency division multiplexing) signal which combines a multiple symbol representations method with a signal clipping method is proposed. In multiple symbol representations alternative signaling points are used to represent one symbol and PAPR is further reduced with the clipping scheme. The performance of the hybrid scheme is compared with the partial transmit sequence which is one of the other PAPR reduction scheme. In partial transmit sequence the input data is divided in to disjoint blocks transformed in to time domain sequence and rotated by phase factors. Theoretical analysis and simulation results validate that the proposed scheme has the ability to provide large PAPR reduction, low bit error rate. Performance analysis is also done with the partial transmit sequence scheme.
Enhancing PAPR reduction for FBMC-OQAM systems by joint both tone reservation...
As all multi-carrier designs FBMC-OQAM signal suffers from large peak-toaverage power ratio (PAPR). There are divers PAPR reduction methods to
solve this problem. Tone reservation (TR) scheme is one of the most famous
PAPR reduction techniques in which a peak cancelling signal is added to the
original one in such a way that PAPR will reduce. Companding is another
easy PAPR reduction technique in which compression of large amplitude
samples and expansion of low one. In this paper, we suggest a new PAPR
reduction scheme called TR&Compd, based on combining tone reservation
and Mu-law companding techniques for FBMC-OQAM systems. The
simulation results show that the new proposed scheme (TR&Compd)
presents better results in term of PAPR reduction compared to TR and Mulaw companding methods taken separately.
Minimization Of Inter Symbol Interference Based Error in OFDM System Using A...
Minimization Of Inter Symbol Interference Based Error in
OFDM System Using Adaptive Decision Mechanism by SNR
Estimation
Peak to Average Power Ratio Reduction in Mc Cdma System by Using Pulse Shapin...
Abstract: One of the drawback of multicarrier code division multiple access (MC CDMA) is the high peak to
average power ratio (PAPR). In this paper A novel scheme based on pulse shaping described for PAPR
reduction. Here three different pulse shaping filters (Raised cosine, Sinc power pulse and Nyqist pulse) are
described for PAPR reduction in MC CDMA system. The method is based on the proper selection of the pulses
for shaping the different sub carriers of the MC CDMA modulation scheme. It is shown by computer simulation
that the scheme achieves the significant improvement in PAPR reduction in MC CDMA system. Its
implementation complexity is much low in comparison to the previous published methods. Thus pulse shaping
technique can be used not only to shape the spectrum of the transmitted signal but also to reduce its PAPR. In
computer simulation It is observed that by using nyquist pulse near about 6.8 db PAPR is obtained. Which is
considerable PAPR reduction than a PAPR value of Original MC CDMA signal
Keywords: MC CDMA, PAPR, PULSE SHAPING, BPSK
SIDELOBE SUPPRESSION AND PAPR REDUCTION FOR COGNITIVE RADIO MIMO-OFDM SYSTEMS...
Orthogonal Frequency Division Multiplexing (OFDM) is deployed to overcome the interference. However, OFDM has a relatively large OOB emissions. In spectrum sharing approaches such as dynamic spectrum access networks, the OOB power levels of secondary transmissions should be kept below a certain level, in order not to interfere with primary transmissions. . The difficulties such as sidelobes and PAPR caused by OFDM is reduced by convex optimization and PTS technique respectively. In this technique each OFDM subcarrier is multiplied with a real-valued weight that is determined in order not to interfere with adjacent users. The problem with the SW technique is involving a very complex optimization. We propose a heuristic approach called convex optimization. It can achieve considerable sidelobe suppression while requiring significantly less computational resources than the optimal solution. Implementation results prove that it can be introduced for real-time transmissions. Optimizing the subcarrier weights and SINR is complex, for which we use the technique of convex optimization. For reducing the PAPR we use Partial Transmit Sequence (PTS) technique.
Sidelobe suppression and papr
Orthogonal Frequency Division Multiplexing (OFDM) is deployed to overcome the interference. However,
OFDM has a relatively large OOB emissions. In spectrum sharing approaches such as dynamic spectrum
access networks, the OOB power levels of secondary transmissions should be kept below a certain level, in
order not to interfere with primary transmissions. . The difficulties such as sidelobes and PAPR caused by
OFDM is reduced by convex optimization and PTS technique respectively. In this technique each OFDM
subcarrier is multiplied with a real-valued weight that is determined in order not to interfere with adjacent
users. The problem with the SW technique is involving a very complex optimization. We propose a heuristic
approach called convex optimization. It can achieve considerable sidelobe suppression while requiring
significantly less computational resources than the optimal solution. Implementation results prove that it
can be introduced for real-time transmissions. Optimizing the subcarrier weights and SINR is complex, for
which we use the technique of convex optimization. For reducing the PAPR we use Partial Transmit
Sequence (PTS) technique.
Index terms : OFDM (Orthogonal Frequency Division Multiplexing), PAPR (Peak Average Power
Ratio), OOB (Out Of Band), IFFT (Inverse Fast Fourier Transform).
MIMO OFDM
This presentation makes note of different techniques present with respect to MIMO OFDM and which can be implemented to improve the wireless system.
I010336469
This document discusses reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) signals using selective mapping (SLM) technique. It begins with an introduction to OFDM and the PAPR problem. It then discusses channel coding techniques like Reed Solomon codes, convolution codes and Hamming codes that can be used for PAPR reduction. The selective mapping technique is described as generating multiple candidate signals representing the same information and selecting the one with the lowest PAPR for transmission. Simulation results show SLM provides better PAPR reduction when used with Hamming coded OFDM compared to Reed Solomon and convolution coded OFDM. The document concludes SLM is an effective technique for P
Mohammed Moneim M.Tech ppt
This document summarizes several papers on techniques for reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. The papers discuss using techniques like partial transmit sequence (PTS), companding transforms, cross entropy methods, and weighted OFDM signals to reduce PAPR without significantly impacting bit error rate or requiring additional processing at the receiver. Simulation results show these techniques can provide PAPR reduction close to exhaustive search methods while maintaining lower complexity.
MIMO-OFDM for 4G network
It is fully based on MIMO-OFDM technique for 4G netork to find out the BER & Capacity in wireless communication system.
Ofdm-cpm Ber Performance and FOBP Under IEEE802.16 Scenario
This document discusses the performance of OFDM-CPM (orthogonal frequency division multiplexing-continuous phase modulation) under IEEE 802.16 scenarios. It shows that OFDM-CPM can exploit frequency diversity in multipath channels unlike conventional OFDM. Simulation results over multipath Stanford University Interim channel models show that OFDM-CPM with an MMSE equalizer outperforms Rayleigh fading channels by exploiting multipath diversity. The document also compares the spectral properties and bit error rate performance of OFDM-CPM to conventional OFDM.
Design and Hardware Implementation of Low-Complexity Multiuser Precoders (ETH...
Design and Hardware Implementation of Low-Complexity Multiuser Precoders (ETH...TSC University of Mondragon
Presentation on the design and FPGA implementation of low-complexity multiuser vector precoders, given at ETHZ Zurich in October 2010New scheme for PAPR reduction in FBMC-OQAM systems based on combining TR and ...
This paper proposes a new hybrid technique called TR&DC that combines tone reservation (TR) and deep clipping (DC) to reduce the peak-to-average power ratio (PAPR) in filter bank multi-carrier with offset quadrature amplitude modulation (FBMC-OQAM) systems. The TR&DC scheme first applies the TR method to the FBMC-OQAM signal, then performs deep clipping on the resulting signal to further reduce any remaining high peaks. Simulation results show the TR&DC approach provides better PAPR reduction than TR alone, reducing the PAPR from 10.1 dB for the original signal to 7.2 dB, a gain of around 2.9 dB. The performance is not
Optimized OFDM Model Using CMA Channel Equalization for BER Evaluation
Orthogonal Frequency Division Multiplexing (OFDM) is a type of Multicarrier Modulation (MCM) technique in which entire bandwidth is divided into large number of small sub-carriers and each subcarrier is transmitted parallel to achieve higher data rates. It has various applications like Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB) and wireless LAN.OFDM technique is widely used in wireless communication system because of its very high data rate. The performance of FFT based OFDM system using Linear and cyclic channel coding and Constant Modulus Algorithm (CMA) equalizer is simulated using simulink model. The BER saving using the optimized proposed model with both linear and cyclic channel coding along with CMA equalizer is evaluated. The proposed work using cyclic channel coding with QPSK/QAM modulation and CMA as channel equalization under AWGN channel results in 52.6% and 96.3% BER reduction as compared to conventional OFDM model without channel coding, channel equalization and channel fading. So, CMA equalizer is used to enhance the performance of OFDM system.
EFFİCİENT PAPR REDUCTİON APPROACH FOR SELECTİVE MAPPİNG İN A STBC MIMO-OFDM S...
The demand for wireless communication increases every day. MIMO system increases the channel capacity
without increasing the bandwidth. OFDM eliminates inter-symbol interference very effectively. By
combining both these technologies ,the resultant data rates are increased and also robustness to multi path
fading effects. But the main drawback of MIMO-OFDM system is its high PAPR. Selective mapping(SLM)
is one of the popular distortion less technique for reducing high PAPR but the computational complexity
for searching optimum phase factors is high. Many evolutionary algorithms like particle swarm
optimisation, artificial bee colony optimization algorithm, cuckoo search algorithm are proposed for
searching optimum phase factors. In this paper two new optimization algorithms social spider
optimization(SSO), adaptive artificial bee colony algorithm are proposed for SLM and Simulation results
shows that compared to adaptive artifctial bee colony algorithm, social spider optimization algorithm(SSO)
gives best phase factors for lower PAPR with fewer number of iterations and also reduces the
computational complexity of SLM technique very efficiently.
B033206014
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Pwm technique to overcome the effect of
Many current communication systems suffer from performance degradation due to the high sensitivity to
high power peaks especially in the nonlinear devices. The author introduces a new concept based on the
Pulse Width Modulation (PWM), namely MIMO-OFDM system based PWM (MO-PWM) to overcome this
deficiency. Here, the peak-to-average power ratio (PAPR) problem in Orthogonal Frequency Division
Multiplexing (OFDM) technique is used as a criterion to check the validity of the proposed work.
Moreover, the proposed system work has been implemented over Field Programmable Gate Array (FPGA),
which is designed to characterize both of the complexity and the speed issues.
The systems performance based MO-PWM and validity have been checked based on a numerical analysis
and a conducted simulation. The simulation results show that the MO-PWM can clearly reduce the PAPR
values nevertheless the used OFDM systems’ specifications, and gives a promising results over some
techniques found in the literature, such as clipping, SLM and PTS under same bandwidth occupancy and
system’s specifications.
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IRJET- Survey Paper on Paper Reduction for MIMO-OFDM Systems using PTS Scheme
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Enhancing PAPR reduction for FBMC-OQAM systems by joint both tone reservation...
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New scheme for PAPR reduction in FBMC-OQAM systems based on combining TR and ...
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Optimized OFDM Model Using CMA Channel Equalization for BER Evaluation
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EFFİCİENT PAPR REDUCTİON APPROACH FOR SELECTİVE MAPPİNG İN A STBC MIMO-OFDM S...
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- 1. O F D M M A S S I V E M I M O M A T L A B P R O J E C T S www.matlabsimulation.com/ofdm-massive-mimo-matlab-projects/
- 2. Fundamental Procedures of OFDM Project The following are the Fundamental Procedures that to be handled on OFDM Massive MIMO Matlab Projects Antenna and channel allocation Beamforming Channel Estimation Mutual Interference Reduction Adaptive or Spatial Modulation Peak-Average- Power Ratio mitigation
- 3. OFDM Multiple I&O under PAPR Moderation PAPR Moderation in OFDM Multiple Input & Output are to be listed here, Adaptive SOICAF Algorithm Block coding SLM with clipping or mapping Clipping noise compression method Tangent Rooting Companding Technique Precoding companding technique
- 4. Estimate in OFDM-MIMO The channel that to be estimated in OFDM-MIMO are as follows, Deep learning Modified Bayes with Gaussian Mixture model Orthogonal matching Pursuit Zero correlation zone method Enhanced Least Mean Square and LMMSE Block sparse channel estimation
- 5. MIMO under Matlab The Functions which are supported by Matlab for MIMO, Error detection and correction Hybrid beamforming Orthogonal space time block (Encode and Decode) Filtering and modulation Multipath fading Equalization and synchronization