Slide 1 Jason Ellis, Staccato Communications

1
Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission
Title Liaison report for 802.11n to Working
Group 15 Date Submitted 15 January,
2004 Source Jason Ellis- IEEE 802.15 Liaison
to 802.11n Company Staccato Communications Ad
dress 5893 Oberlin Drive, Suite 105, San Diego,
CA 92121 Voice1 [phone], FAX 1
[phone], E-Mailjsnellis_at_ieee.org Re
Abstract 802.11n liaison report for IEEE
Working Group 15 Purpose Notice This
document has been prepared to assist the IEEE
P802.15. It is offered as a basis for discussion
and is not binding on the contributing
individual(s) or organization(s). The material in
this document is subject to change in form and
content after further study. The contributor(s)
reserve(s) the right to add, amend or withdraw
material contained herein. Release The
contributor acknowledges and accepts that this
contribution becomes the property of IEEE and may
be made publicly available by P802.15.
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Liaison report for 802.11n to Working Group
802.15Provides updates of major discussions and
activitiesJanuary 2004 IEEE 802.15
MeetingVancouver
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Goals for the Week

• Complete and adopt
• usage models (Work in progress, time frame -
  March)
• functional requirements (Work in progress, time
  frame - March)
• comparison criteria (Work in progress, time
  frame - March)
• Issue a call for proposals (Likely to happen in
  March-May)
• TASK GROUP CHAIR ELECTION HELD IN WORKING GROUP
  PER WORKING GROUP RULES
• Matthew Shoemake recently resigned from being
  802.11n Chairman
• Bruce Kramer of Globalspan Virata was elected as
  the new Chairman

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Need for 4G High-Speed WLANs
Majoritybelieve 100-200 Mbps rates

• Higher data rates
• Larger range
• More users

doc. IEEE 802.11-04/0136-00-000n
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Technology Discussions(2 identified technology
choices)
Many presentationssupportingMIMO OFDM
Path to 1 GBit/s WLAN ?
PSSS (Example) MIMO OFDM (Example)
System 1 Gbit/s 100 MHz channel Single carrieror 5 carriers 1 Gbit/s, 100 MHz channel 256 QAM
Analog RF in Tx / Rx Linearity lt 25 dBc PAPR 6 dB Linearity gt 40 dBc (?) PAPR gt 17 dB (?)
ADC / DAC 6,5 bit / 200 MSPS DAC in Tx (2x)or 5x 5 bit / 40 MSPS DAC in Tx (2x) 310 Integrate Dump at 200 MSPSor 5x 62 Integrate Dump at 40 MSPS No ADC in Rx gt 14-16 bit / gt200 MSPS DAC in Tx gt 12-14 bit / gt200 MSPS ADC in Rx (2 each)
Signal processing None required IFFT / FFT,gt 256 points, 200 MSPS, 14-16 bit Viterbi (7/8 ?), LDPC (?)
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Parallel Sequence Spread Spectrum (PSSS)
Characteristics
Type of system Single carrier, spread spectrum Signal processing and coding Applicable over different modulations
Range robustness Processing gain of 15dB and higher Coding gain gt 5 dB Highly scaleable with identical system building blocks
Specific data rate 2 bit/s/Hz ... 10 bit/s/Hz,potential for gt 20 bit/s/Hz But not at the cost of robustness and/or complexity
Multipath fading Tolerates multipath fading,similar in performance as OFDM No add-on of TCM, Viterbi, etc.
Symbol errors Strong robustness through underlying coding in PSSS E.g. tolerates 21 1-value errors in 31-chip sequence without DSP or complex digital design
Implementation complexity Shift-register digital structure in Tx Simple integrate dump in Rx(DSSS-like reference signal) No FFT, Viterbi etc. low complexity Simpler DAC / ADC (or no ADC), no approximations of analog signals Low sensitivity against non-linearity
Low cost Lower digital and analog complexity results in small die sizes Overcomes barriers for performance growth in todays technologies
Time-to-market Use of all well-known components Low demands in chip complexity High reuse of existing chip designs No need for new chip processes
Technology potential Enables 0,5 / 1 GBit/s WLAN(in 50/100 MHz channel) At lower chip complexity / criticality / cost than todays 54 Mbit/s WLAN
doc. IEEE 11-04-0076-00-000n
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Different Channel Codes
Many discussions on coding concepts

• Convolutional code memory 6 (abbreviation CC6)
• Convolutional code memory 8 (CC8)
• Parallel concatenated code 9, UMTS turbo code
  memory 3 (PCC3), random bit interleaver (over
  packet), 8 iterations
• Serially concatenated code 10, inner memory 1,
  outer memory 2 code (SCC2), random bit
  interleaver (over packet), 15 iterations
• LDPCC, regular 11 (LDREG), random edge
  interleaver (over packet), 40 iterations (note
  1-Rate dv/dc)
• Rate 1/2 variable node degree dv3, check node
  degree dc6 rate 3/4 dv3, dc12 rate 7/8
  dv3, dc24
• LDPCC, irregular 12 (LDIRR), random edge
  interleaver (over packet), 40 iterations
• dv,13 (89.74 of variable nodes), dv,24
  (2.78), dv,316 (7.48) rate 1/2 dc8 rate
  3/4 dc16 rate 7/8 dc32

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Likely 802.11n Transmitter
channel encoder

• Shown with 2 TX antennas

9
Likely 802.11n Receiver
channel decoder

• Shown with 2 RX antennas

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Contributions Related to FRCC

• Throughput vs. Range Curves, 04-0040r0 (to be
  presented in subgroup) ?
• Point to point sim. , 04-0078r0, Bjerke (to be
  presented in subgroup) ?
• Time correlated packet errors in a MAC
  simulation, 04-0064r0, Vlantis (to be presented
  in subgroup) ?
• Proposal for statistical channel error model
  (UCLA), 04-0012r1, Vlantis (to be presented in
  subgroup) ?
• Considerations for STS for MIMO-OFDM, 04-0002r2,
  Rosdahl, 30 minutes ?
• New preamble structure for AGC in a MIMO-OFDM
  system, 04-0046r1, Aoki, 15 minutes ?
• The sensitivity of performance to antenna element
  spacing when using 802.11n channel model,
  04-0049r1, Takeda, 15 minutes ?
• Comments on Ergodic and Outage Capacity ,
  04-0015r2, Choi, 15 minutes ?
• Capacity of MIMO systems as a function of antenna
  parameters, 04-0077r0, Skafidas, 25 minutes
• Japanese Frequency Regulations Related to TGn
  Functional Requirements, 04-0033r0, Inoue, 15
  minutes
• PHY Abstraction for MAC Simulation, TBD, Jechoux,
  30 minutes

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Contributions Not related to FRCC

• Practical MIMO Arch. , 03-0999r0, Moon, 30
  minutes (Tuesday or later presentation)
• Thoughts on TX Spectral Mask, 04-0060r0, Hansen,
  20 minutes
• Different Channel Codes for 802.11n, 04-0014r0,
  Ten Brink, 20 minutes
• 04-0016r2, Choi, 35 minutes
• Parallel Sequence Spread Spectrum (PSSS),
  04-0076r0, Wolf, 20 minutes (Tuesday or later)
• LDPC vs. Convolutional Codes, 04-0071r0,
  Purkovic, 25 minutes
• Low Overhead , 04-0020r0, Faulkner, 15 minutes
• 04-0003r0, Edmonston, 12 minutes
• TGn Channel Models, 03-0940r2, Lanzl, 5 minutes
• Pros and cons , 04-0075r0, 20 minutes (Must be
  presented before Thursday)
• The Performance of RS Codes in MIMO, TBD, Pen Li,
  15 minutes