Wireless LAN & 802.11ac Wi-Fi Fundamentals #AirheadsConf Italy
•Download as PPTX, PDF•
8 likes•3,480 views
This document provides an overview of 802.11ac Wi-Fi technology including: - 802.11ac extends 802.11n with wider channels of 80/160MHz, higher order modulation up to 256-QAM, and more spatial streams up to 8. - It discusses channel allocations and wider channels in 802.11ac as well as the benefits and limitations of wave 2 features like MU-MIMO and 160MHz channels. - Key aspects of 802.11ac receivers and antennas are covered including how interference impacts receivers and how to analyze antenna patterns and coverage.
Recommended
Recommended
More Related Content
What's hot
What's hot (20)
Viewers also liked
Viewers also liked (14)
Similar to Wireless LAN & 802.11ac Wi-Fi Fundamentals #AirheadsConf Italy
Similar to Wireless LAN & 802.11ac Wi-Fi Fundamentals #AirheadsConf Italy (20)
More from Aruba, a Hewlett Packard Enterprise company
More from Aruba, a Hewlett Packard Enterprise company (20)
Recently uploaded
Recently uploaded (20)
Wireless LAN & 802.11ac Wi-Fi Fundamentals #AirheadsConf Italy
- 1. 802.11ac Wi-Fi Fundamentals Eric Johnson June 2014
- 2. CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved 2 #AirheadsConf Agenda 11ac Standards Physical Layer Overview 11ac Data Rates Radio Realities Receivers Antennas 11ac Beamforming 11ac Products
- 3. 3 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 802.11ac Technology Overview Think of 11ac as an extension of 11n • 11n specification introduced/leveraged: • 2.4 and 5 GHz supported • Wider channels (40 MHz) • Better modulation (64- QAM) • Additional streams (up to 4 streams) • Beam forming (explicit and implicit) • Backwards compatibility with 11a/b/g 11ac introduces • 5 GHz supported • Even wider channels (80 MHz and 160 MHz) • Better modulation (256-QAM) • Additional streams (up to 8) • Beam forming (explicit) • Backwards compatibility with 11a/b/g/n • Refer to http://www.802- 11.ac.net for in-depth information
- 4. 4 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Wider Channels • 80 MHz channel widths supported in first generation – 80 MHz is 4.5x faster than 20 MHz – 80 MHz is contiguous – Per packet dynamic channel width decisions • Future releases will allow for 160 MHz channel widths – 160 MHz can be either contiguous or in two non- contiguous 80 MHz slices
- 5. 5 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Channel Allocations
- 6. 6 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 802.11ac Channels (ETSI) Channel Freq (MHz) UNII I and UNII II 2x 80 MHz 4x 40 MHz 8x 20 MHz Channel Freq (MHz) UNII II extended 2x 80 MHz 5x 40 MHz 11x 20 MHz 36 4844 5240 56 6460 Band Edge 5180 5200 5220 5240 5260 5280 5300 5320 5350 Band Edge 5150 100 112108 116104 120 128124 5500 5520 5540 5560 5580 5600 5620 5640 Band Edge 5470 136 140 Band Edge 5680 5700 5725 132 5660
- 7. 7 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 802.11ac Channels (FCC) Channel Freq (MHz) UNII I and UNII II 2x 80 MHz 4x 40 MHz 8x 20 MHz Band Edge Channel Freq (MHz) 5850 US UNII III 1x 80 MHz 2x 40 MHz 5x 20 MHz Channel Freq (MHz) UNII II extended 3x 80 MHz 6x 40 MHz 12x 20 MHz 36 4844 5240 56 6460 Band Edge 5180 5200 5220 5240 5260 5280 5300 5320 5350 Band Edge 5150 149 161157153 5745 5765 5785 5805 Band Edge 5725 165 5825 100 112108 116104 120 128124 5500 5520 5540 5560 5580 5600 5620 5640 Band Edge 5470 136 140 Band Edge 5680 5700 5725 132 5660 144 5720 Weather Radar
- 8. 10 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Dynamic Bandwidth Management: Channel Usage with Two APs
- 9. 11 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Wave 2
- 10. 12 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Wave 2 of 11ac • What will wave 2 802.11ac deliver? • MU-MIMO • Use AP MIMO resources more effectively • Transmit data to multiple devices simultaneously: for example 4SS AP streaming data to four 1SS clients simultaneously • 4x4:4SS • Benefit of additional stream mostly for MU-MIMO • Not anticipating any 4x4:4SS client devices • Adds 33% to max datarate • VHT160 • Doubles max datarate • Practical problem: only 2 VHT160 channels available in entire 5GHz band • Max 5GHz radio throughput triples again! • 450 (11n 3x3 HT40), 1,300 (11ac 3x3 VHT80), 3,467 (11ac 4x4 VHT160) • When will it be available? • Radio chipsets available late 2014 • Products in 2015
- 11. 13 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Reasons not to wait for Wave 2 • Unlikely to see any 4x4:4SS client devices • Use of VHT160 not practical for typical enterprise deployment • MU-MIMO is a nice-to-have optimization. • How well it will work and what the real benefits are is still not entirely clear • Requires new client devices (Wave 1 clients also not FW upgradeable) • Wave 1 is here now (technology, products, market momentum), offering huge advantages over 11n. Wave 2 is the expected next step in the evolution of the technology. • In general: the next wave in technology is always around the corner, something better is always coming Once Wave 2 is available, we’ll for sure be talking about Wave 3. • No different from when 11n 2x2 products were introduced and it was clear that 3x3 products would be available within 18 months.
- 12. 14 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 11ad and what it means • 60GHz band, three channels in most countries (each 2.16GHz wide), each providing up to 6.8Gbps PHY datarate • No MIMO • Challenges: Non-Line of Sight (NLOS) connections, range, penetrating obstacles (and people) • Targeted to clean up a cluttered desk or TV cabinet • Likely not appropriate for traditional AP use. But can be interesting for related applications like wireless docking, high-capacity WLAN hotspots, AP backhaul/aggregation, etc. • It is being investigated (but no product plans as of yet) • Standard is available, certification program in place • Wi-Fi Alliance WiGig Alliance
- 13. 15 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Understanding 11ac Data Rates
- 14. 16 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Terminology • Symbol: basic element containing 1 to 8 bits of information • Tone/Sub-Carriers: OFDM is made up of many tones. Each symbol is mapped to a tone. • Cyclic Extension: technique used in OFDM to protect against multipath interference – You need cyclic extension but it is dead air and consumes transmit time • Guard Band: Space between channels. In these regions tones have a constant value of zero amplitude • Pilot Tones: Used to train the receiver and estimate the channel • Radio Channel: For Wi-Fi 20, 40, 80, or 160 MHz of spectrum • Propagation Channel: everything that happens between the transmitter and receiver • FEC: Forward Error Correction. Redundant information that is sent to assist the receiver in decoding the bits.
- 15. 17 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Sub-carriers 52 subcarriers (48 usable) for a 20 MHz non-HT mode (legacy 802.11a/g) channel fc +10MHz-10MHz 26 carriers 26 carriers 56 subcarriers (52 usable) for a 20 MHz HT mode (802.11n) channel fc 28 carriers 28 carriers 114 subcarriers (108 usable) for a 40 MHz HT mode (802.11n) channel fc +10MHz-20MHz 57 carriers 57 carriers +20MHz-10MHz 242 subcarriers (234 usable) for a 80 MHz VHT mode (802.11ac) channel An 80+80MHz or 16MHz channel is exactly two 80MHz channels, for 484 subcarriers (468 usable) 121 carriers 121 carriers fc +10MHz-20MHz +20MHz-10MHz-40MHz -30MHz +30MHz +40MHz OFDM subcarriers used in 802.11a, 802.11n and 802.11ac +10MHz-10MHz Guard Tones
- 16. 18 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf QAM constellations Amplitude +1 Amplitude -1 Quadrature-1 Quadrature+1 Amplitude +1 Amplitude -1Quadrature-1 Quadrature+1 Amplitude +1 Amplitude -1 Quadrature-1 Quadrature+1 16-QAM constellation 64-QAM constellation 256-QAM constellation Constellation diagrams for 16-, 64-, 256-QAM
- 17. 19 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf How do I get to the data rate for a given MCS? • Basic Symbol Rate – 312.5 KHz – 3.2 ms • Cyclic Extension – t/4 0.8 ms – t/8 0.4 ms • Bits Per Tone – BPSK 1 – QPSK 2 – 16 QAM 4 – 64 QAM 6 – 256 QAM 8 19
- 18. 20 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Raw Data Rates • #Tones * Bits per Tone * Symbol Rate – 16 QAM, 20 MHz – 52 * 4 * 0.3125 = 65 Mbps 20
- 19. 21 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Correct for Cyclic Extension 21
- 20. 22 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Apply FEC Coding 22
- 21. 31 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Receivers
- 22. 32 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Receiver Line Up 32 ADC Symbol Decode Down Convert LNA
- 23. 33 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Receiver Impairments • Analog Compression – Modern LNAs have very effective input power tolerance • Digital Compression – This is where a high power signal hits the Automatic Gain Control (AGC) Circuit. Gain drops and receiver sensitivity degrades – The radio can be totally blocked if the power hits the Analog to Digital Converter (ADC) and consumes all the bits • Intermodulation – Again, the effective linearity of modern LNAs reduces the impact of this 33
- 24. 34 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf DAS Interference: Example • Without filtering any signal that hits the receiver above -45 dBm will cause a reduction of sensitivity • The degradation continues until about -15 dBm at which point the signal is totally blocked • With a 100 mW (20 dBm) DAS system at 2100 MHz – Tx 20 dBm – Effective rx antenna gain 3 dBi – 1st meter at 2100 MHz -39 dB • Power at 1m -19 dBm – No impact distance 40 meters 34
- 25. 35 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced Cellular Coexistence • Proliferation of DAS and new LTE bands at 2.6 GHz are creating issue for Wi-Fi solution • All new APs introduced by Aruba in the last 12 months and going forward have implemented significant filtering into the 2.4 GHz radio portion to combat this • Design solution – Use high-linear LNA followed with a high-rejection filter to achieve rejection target and little sensitivity degradation; – Design target: Minimal Sensitivity degradation with -10dBm interference from 3G/4G networks (theoretical analysis).
- 26. 41 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Antennas
- 27. 42 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Reading Antenna Pattern Plots - Omni 42 Azimuth Elevation Omnidirectional Antenna (Linear View) -3 dB Sidelobes
- 28. 43 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Reading Antenna Pattern Plots - Sector 43 Azimuth Elevation Sector Antenna (Logarithmic View) -3 dB -3 dB SidelobesBacklobe Front Back Side
- 29. 44 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 44 ANT-2x2-5010 Heat Maps
- 30. 45 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Ant-2x2-5010 Antenna Patterns 45 • Model 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345 a a 5 dB per division • Measured
- 31. 46 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Ant-2x2-5010 Simple projection 46 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345 a a 5 dB per division Assuming 20m install height 0m 20m 50m 100 m 200 m
- 32. 47 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Analysis • The heatmaps are shown across 100m by 100m and 1000m by 1000m areas • These are flat earth models and the antenna is straight up above the plane • 2 ray propagation effects are not included 47
- 33. 48 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf C/I Contours CI dBm C/I Contours CI dBm Heat Map: Antenna at 5 m height 48 100 m 1000 m
- 34. 49 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf C/I Contours CI dBm C/I Contours CI dBm Heat Map: Antenna at 10 m height 49 100 m 1000 m
- 35. 50 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf C/I Contours CI dBm Heat Map: Antenna at 20 m height 50 100 m 1000 m C/I Contours CI dBm
- 36. 51 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf C/I Contours CI dBm C/I Contours CI dBm Heat Map: Antenna at 40 m height 51 100 m 1000 m
- 37. 52 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Antenna Basic Physics • When the charges oscillate the waves go up and down with the charges and radiate away • With a single element the energy leaves uniformly. • Also known as omni-directionally 52
- 38. 53 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Building Arrays: 2 Elements • By introducing additional antenna elements we can control the way that the energy radiates • 2 elements excited in phase 53 l/2 0 30 60 90 120 150 180 210 240 270 300 330 Linear Plot 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345 dB Plot
- 39. 54 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345 Building Arrays: 4 Elements • By introducing additional antenna elements we can control the way that the energy radiates • 4 elements excited in phase – Equal amplitude 54 Linear Plot dB Plot 0 30 60 90 120 150 180 210 240 270 300 330
- 40. 55 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345 0 30 60 90 120 150 180 210 240 270 300 330 Building Arrays: 4 Elements • By shaping the amplitude we can control sidelobes • 4 elements excited in phase – Amplitude 1, 3, 3, 1 55 Linear Plot dB Plot
- 41. 56 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240 255 270 285 300 315 330 345 0 30 60 90 120 150 180 210 240 270 300 330 Building Arrays: 4 Elements Phase • By altering phase we can alter the direction that the energy travels • 4 elements excited with phase slope – Even amplitude 56 Linear Plot dB Plot
- 42. 57 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 802.11ac Beamforming
- 43. 58 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Beamforming: Notes • AP 22x series has 11ac beamforming support in 2.4 and 5 GHz bands • Works with clients that support 11ac beamforming function – This is at a minimum all 11ac client devices using Broadcom chipsets – Support will have to come to all devices to compete with Broadcom offering • 11ac beamforming is standards based – first standard that is doing this the “right” way – 11ac beamforming represents the consensus view of the 1000’s of contributors to the standards process • 11ac beamforming is implemented in baseband. – It works with all antenna subsystems – The total number of beamforming combinations is effectively infinite • 11ac actively tracks users so has a recent channel estimate between the AP and client that is updated frequently 58
- 44. 59 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Channel state information, implicit and explicit beamforming estimation 59 Explicit feedback for beamforming (802.11n and 802.11ac) 1 (Beamformer) Here’s a sounding frame 2 (Beamformee) Here’s how I heard the sounding frame 3 Now I will pre-code to match how you heard me sounding frames Beamformed frames feedback from sounding Explicit feedback for beamforming Beamformer Beamformee Actual CSI
- 45. 60 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 5- 4- 3- 2- 1- 0 1 2 3 4 5 1 10 4- 1 10 3- 0.01 Antenna 1 Antenna 2 Antenna 3 Wavelengths EFieldAmplitude Client Antennas h11 h21 h31
- 47. 62 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Line of Sight • 3 stream AP • Smartphone – 1 Antenna/1 Stream Client AP 0 10 20 30 40 50 60 70 8090100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350
- 48. 63 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Simple Reflection • Let’s introduce two reflection surfaces and look at the impact of one bounce on each side Client AP 0 10 20 30 40 50 60 70 8090100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 Virtual Antenna Pattern
- 49. 64 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Multi Stream Client • The reflections allow beamforming to send different streams with different antenna pattern through the system Client AP 0 10 20 30 40 50 60 70 8090100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 0 10 20 30 40 50 60 70 8090100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 0 10 20 30 40 50 60 70 8090100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 Stream1 Stream2Stream3
- 50. 65 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Beamforming • Stream 3 now appears on all three antenna – Here is how each transmitted component shows up at the client 65 5- 4- 3- 2- 1- 0 1 2 3 4 5 1 10 3- 0.01 0.1 1 10 Antenna 1 Wavelengths EFieldAmplitude Now add them!
- 51. 66 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Similarly Stream 1 and 2 66 Stream 1 Stream 2
- 52. 67 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 0 10 20 30 40 50 60 70 8090100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 0 10 20 30 40 50 60 70 8090100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 0 10 20 30 40 50 60 70 8090100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 11ac Beamforming across an 80 MHz channel • The standards based algorithm actually works out patterns for each sub carrier • Below is the pattern for stream 1 at 5460, 5500, 5540 MHz
- 53. 68 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Aruba 11ac Solutions
- 54. 69 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf AP-224/225 802.11ac 3x3 AP • Enterprise class 3x3 802.11ac • Aggregate TCP platform throughput performance >1Gbps • Two platform models: – AP-224: external antennas (3x, dual band) – AP-225: integrated antennas – “Advanced Cellular Coexistence” support • Dual radio: – 802.11n 3x3:3 HT40 2.4GHz(450Mbps), support for “TurboQAM” – 802.11ac 3x3:3 HT80 5GHz (1.3Gbps) – 11ac beamforming supported in both bands • Wired interfaces – Network: 2x 10/100/1000Base-T Ethernet, with MACSec support – USB 2.0 host interface, console port, DC power • Will require 802.3at PoE (or DC power) for full functional operation – Functional, but capabilities reduced when powered from 802.3af POE • Enterprise temperature range, plenum rated, TPM
- 55. 70 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Indoor 802.11ac Needs an Outdoor Complement • Fully ruggedized for extreme environments • Gigabit performance • Simplified installation • Inconspicuous design • Designed for indoor-use • Gigabit performance
- 56. 71 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf AP-270 Series – Detailed Overview Antenna Gain: 5 dBi 2G: 3x3:3 11ac (2.4 GHz) 5G: 3x3:3 11ac (5.15 to 5.875 GHz) 11ac Beamforming Conducted Tx Power 2G: 23 dBm per branch (28 aggregate) MAX EIRP = 36 dBm 5G: 23 dBm per branch (28 aggregate) MAX EIRP = 36 dBm Power Interface: AC and 802.3at (PoE+) Power Consumption: 25 W Gigabit Ethernet WAN + LAN Port Advanced Cellular Coexistence Designed to Both IP66 and IP67 -40 to +65°C No Heater. Start and operate.
- 57. 72 @arubanetworks What 11ac can Deliver
- 58. 73 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Performance: 3 Stream 11ac outdoors! 850 Mbps TCP!
- 59. 74 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Performance: Samsung GS4
- 60. 75 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf
- 61. 76 Thank You #AirheadsConf CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved
Editor's Notes
- 11ac is an extension of 11n. Those of you who were around for the 11n roll out will notice a lot of déjà vu. The big difference with 11ac is that end users care about wireless speeds now. Client devices are differentiating themselves with 11ac support (HTC One, Samsung GS4, MacBook Air)
- More on channel widths later. The important thing to know right now is that you get more than a 1 for 1 improvement in throughput. And we think must customers can deploy 80 mhz channels without significant problems now that the standard does a better job of detecting channel width. The AP will automatically fall back to 20 or 40 mhz channels.
- ETSI: EU, Argentina, Brazil, Egypt, Hong Kong, India, Indonesia, Malaysia, Qatar, Saudi Arabia, South Africa, Thailand, UAE (all core countries), and more Japan: similar restrictions, different power limits, DFS details Pattern = ETSI DFS required
- FCC: US, Australia Canada, Colombia, Korea, Mexico, New Zealand, Singapore, Taiwan (all core countries), and more Orange = cannot be used due to doplar weather radar interference Blue = added 144 which opened a 20, 40 and 80 mhz channel Pattern = FCC DFS required FCC has talked about adding additional channels but there is no official word on that yet. Unknown is new hardware will be required because we don’t know what the DFS requirements will be. Most customers will deploy 80 MHz channels. There is a dynamic per packet channel width decision made in 11ac. Some of that was standard in 11n but the sensitivity was too low (-62) and it has been increased to -72 and seems to work now. High density deployments and special cases may still want 20 or 40 mhz channels depending on utilization and use case.
- 50 cm from das 1-2 from directional base station
- Same range for rates that also exist in 11n, add 2 more rates in core Note that coverage areas may expand using 11ac TxBF
- Rates are ~doubled, but range is slightly reduced (-3dB, 70%)
- Signal level: assumes a site survey is done with an AP transmitting at +17dBm
- This is the pattern plot for a high gain omnidirectional antenna. The azimuth (top view) shows almost equal signal in all directions. The elevation (side view) shows a narrow beamwidth to each side. It is important to realize that the polar pattern plot is showing the pattern of the antenna in decibels. Remember that for every 6 dB decrease, the signal travels half the distance. If you convert the pattern plot to a scaled or linear representation of the signal, it would look somewhat like the linear view at the bottom center of the slide.
- This antenna is a directional sector antenna. The polar pattern plots shows a horizontal beamwidth of about 90 degrees and a vertical beamwidth of about 16 degrees. Notice that the 3 dimensional view at the bottom of the slide is a logarithmic view and not a linear view, therefore it is displaying the antenna pattern based upon the decibel measurements.
- TurboQAM: proprietary solution to support 11ac 256-QAM modulation in 2.4GHz, potentially offering 33% throughput increase 802.3af POE: No USB No second Ethernet port 1x3:1ss 2.4GHz radio