1 / 11

802.11 WNG Presentation: 6-10 GHz extensions to 802.11, Part 3

802.11 WNG Presentation: 6-10 GHz extensions to 802.11, Part 3. Date: 2012-03-13. Authors:. Abstract.

dixon
Download Presentation

802.11 WNG Presentation: 6-10 GHz extensions to 802.11, Part 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 802.11 WNG Presentation: 6-10 GHz extensions to 802.11, Part 3 Date: 2012-03-13 Authors:

  2. Abstract This document presents the possibility of using existing shared spectrum allocation in 6-10.5GHz as an extension frequency band for an 802.11ac PHY with a 500MHz bandwidth. It is a follow up to document 12/0096r0, 11/743r0, and 11/385r1 https://mentor.ieee.org/802.11/dcn/12/11-12-0096-00-0wng-6-10ghz-extensions-to-802-11ac-part2.ppt https://mentor.ieee.org/802.11/dcn/11/11-11-0743-00-0wng-6-9ghz-extensions-to-802-11.ppt https://mentor.ieee.org/802.11/dcn/11/11-11-0385-01-0wng-ultrwideband-spectrum-for-802-11.ppt

  3. What’s New in This Presentation? • >1Gbps PHY rates • Link budgets • PHY issues • Eb/No requirements • ADC/DAC requirements • EVM requirements • Use cases and spatial capacity • How this proposal complements 802.11ac

  4. Why a frequency extension for 802.11ac? • Gives needed capacity for high rate communications • Wireless docking/monitors using 802.11ac will tax existing 5GHz spectrum allocation • Some countries highly restrict 5GHz spectrum (China) • High density environments (cubicle farms) will have serious spatial capacity problems…interference, frequency reuse, etc. • Could leverage existing 802.11ac/ad MAC and PHY extensions • MU-MIMO, STBC, and other extensions will greatly enhance link budget…more than doubling range of SISO • Relatively “low hanging fruit” for existing 5GHz radios • Band starts at 6GHz – just above 5GHz ISM band • Extension of 5GHz bands – minimal antenna and RF impact • High bandwidth allows precision ranging/location • For applications that need relatively short range (<10 meters) and very high spatial capacity, this spectrum could be ideal

  5. 6-10GHz gives superb capacity for cube farms 2.5 m • At 320Mb/s, radius of coverage is ~3 meters (7.5GHz, SISO, CM2) • 960Mbps will give about 1.5 meters range (SISO, CM2) • In a cubicle, each user could have a dedicated channel • No beamforming assumed • Negligible interference between users • Specific results will depend on Eb/No, frequency, etc. • Small cells yield highest spatial capacity in users per square meter • 6-10GHz has a coverage area just larger than an average cubicle • With 7 channels available, channel reuse can be optimized for maximum capacity with minimum interference

  6. Other Comments • Existing 802.11ac/ad PHY + MAC provides most of the hooks • 450/500MHz minimum bandwidth will require new MCS combinations • Effectiveness of beamforming is TBD • MIMO/MU-MIMO could be very useful • Can use simpler OFDM modulation (e.g. 16-QAM) • Lower EVM, less hardware complexity (but higher sampling rates) • At least five 500MHz channels are available in 6-9GHz • Up to 8 in some countries • Allows k=4 frequency reuse for high user density • Studies may be required to see how well MU-MIMO will operate • Other regulatory domains may permit <500MHz BW • Power consumption will be attractive • SISO: Estimate <400mW for 1Gbps in 40nm • 2x2 MIMO: Estimate <500mW for 1Gbps in 40nm

  7. Background Work on Channel Models • Much work has been done on propagation models • http://grouper.ieee.org/groups/802/15/pub/2002/Nov02/02368r4P802-15_SG3a-Channel-Modeling-Subcommittee-Report.ZIP )

  8. Example link budget • Based on 802.15.3a model with 528MHz BW • 8% PER for 960 Mbps is at about 1.5 meters with 7.1 dB margin

  9. PHY Issues • Shannon capacity is linear with bandwidth • In 11ac, multiple tradeoffs over bandwidth, number of spatial streams, modulation order • For >500MHz channels, can use SISO, MRC, simple (2x2) MIMO, and lower order modulation • Selective fading channel with multiple fades (MRC works well) • Eb/No requirements are much lower than narrowband systems • For 960 Mbps at 1.5 meters: • SISO • ADC/DAC resolution required: 6 bits • EVM ≈ -21.5 dB • assumes modified dual carrier modulation, LDPC • Change in MDCM demapper can yield >2Gbps PHY • Adding maximum ratio combining improves range or robustness • 2x2 MIMO gives 3-6dB link budget improvement

  10. Spatial Capacity • Wireless dock and sync need very high spatial capacity • Cubicle density in enterprise is worst case • Wi-Fi Display will need multiple HD video grade streams • Dedicated channels desired for enhanced QoS, lower interference • 6-10 GHz offers very high capacity with low complexity • 6-10GHz systems can have a minimum of 5 channels globally, up to 8 in US • Each system can operate in adjacent frequency channels • 5 channels x 1 Gbps/channel / 2.25 sq meters = 2.2 Gbps/sec/m2 • MRC or MIMO will increase coverage area and/or data rate • SISO would be ideal for mobile, handheld platforms • Very high spatial capacity without multiple antennas/spatial streams • Fewer antennas, fewer RF and ADC/DAC chains

  11. Summary • Additional spectrum will be needed for wireless docking and sync • 6-10 GHz offers a minimum of 5 channels, each of which can have 1Gbps or more in a cubicle usage model • Spectrum regulations are in place worldwide • >2Gbps/m2 spatial capacity • Design of a 6-10 GHz RF is a relatively easy extension to existing 802.11ac • Band begins just above 5.7GHz ISM band • Antennas exist that cover 5-10 GHz, allowing “11ac+” • Can use SISO, MRC or “easy” MIMO (2x2, 16-QAM) • Most capacity improvement comes from B term in Shannon • Some new MCS will need to be added to 11ac • Much work has already been done on channel models, regulations, link budgets

More Related