July 12, 2000 doc.: IEEE 802.15-<00210> March 2001 Project: IEEE P802.11b Working Group for Wireless Local Area Networks (WLANs) Submission Title: [Summary of SG Proposal to TGg] Date Submitted: [ 12 March 2001 ] Source: [ T. O’Farrell, L.E. Aguado & C. Caldwell] Company [Supergold Communication Ltd. ] Address [ 2-3 Sandyford Village, Sandyford, Dublin 18, Ireland ] Voice:[ +44 113 233 2052 ], FAX: [ +44 113 2332032 ], E-Mail:[ tim.ofarrell@supergold.com ] Re: [ Physical layer modulation proposal for the Higher Rate Extension to 802.11b Standard] Abstract: [ This contribution is a summary presentation of Supergold’s MBCK proposal for the Higher Rate Extension to 802.11b Standard] Purpose: [ Proposal for the Higher Rate Extension to 802.11b Standard] Notice: This document has been prepared to assist the IEEE P802.11. 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 P802.11. O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd. <author>, <company>

Outline of the Presentation July 12, 2000 doc.: IEEE 802.15-<00210> March 2001 Outline of the Presentation Comparison Criteria Performance Evaluation MBCK Attributes Soft Decision Decoding Conclusions O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd. <author>, <company>

Comparison Criteria MBCK Performance with an DFE equaliser July 12, 2000 doc.: IEEE 802.15-<00210> March 2001 Comparison Criteria The following new results have been included in documents 336r48G and 1017r28G MBCK Performance with an DFE equaliser Timing off-set performance Jamming test completed for PER=10-2 O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd. <author>, <company>

Comparison Criteria – Cont. July 12, 2000 doc.: IEEE 802.15-<00210> March 2001 Comparison Criteria – Cont. Anomalies addressed PA back-off figures ISI only multipath performance at 25 ns rms delay spread O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd. <author>, <company>

Performance Evaluation March 2001 Performance Evaluation Note: performance of reference systems from IEEE 802.11-01/064r1, “Comparison of 802.11g Proposals” PER vs Eb/No (1000B) O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Performance Evaluation March 2001 Performance Evaluation Note: performance of reference systems from IEEE 802.11-01/064r1, “Comparison of 802.11g Proposals” PER vs SNR (1000B) O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Performance Evaluation March 2001 Performance Evaluation Note: performance of reference systems from IEEE 802.11-01/064r1, “Comparison of 802.11g Proposals” PER vs SNR (1000B) O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

M-ary Bi-Code Keying Inner MBCK 64 state quaternary block code March 2001 M-ary Bi-Code Keying Supergold’s solution is a concatenated coding scheme consisting of: Inner MBCK 64 state quaternary block code Maps to 16 QAM constellation and spans 4 symbols. Outer Reed Solomon (63,k) code k=41 for 22 Mb/s and k=57 for 30 Mb/s O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

MBCK-RS Encoding Chain July 12, 2000 doc.: IEEE 802.15-<00210> March 2001 MBCK-RS Encoding Chain 32-Correlator Bank Greatest Peak Detector RS Decoder 6 1 Rx I IN Rx Q IN rI rQ c’ DATA OUT y 64-ary Bi-Code Keying Select 1 of 64 Sequences RS Encoder DATA IN d c xI xQ 8 I OUT Q OUT 32 Sequences + Complements O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd. <author>, <company>

March 2001 MBCK Attributes Thorough evaluation of MBCK according to the comparison criteria completed: (ref. 336r48G and 1017r28G). Good coding gain PA non-linearity effects are constrained for back-offs > 4 dB MBCK waveform ameanable to equalisation by all the key equalisation techniques O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

MBCK Attributes - Cont Supports 22 and 30 Mb/s modes March 2001 MBCK Attributes - Cont Supports 22 and 30 Mb/s modes Tolerant to 10% rms timing jitter Tolerant to 4o rms phase noise O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

March 2001 MBCK Attributes - Cont MBCK is a robust coding scheme that meets the TGg comparision criteria Low complexity code (7 kgates for MBCK and 7 kgates for Reed Solomon Code) Works with the same radio as 802.11b Low cost solution Readily implementable giving short time to market (RTL code for MBCK available) O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Soft Decision Decoding with MBCK March 2001 Soft Decision Decoding with MBCK A soft metric can be readily obtained from the MBCK signal set using common symbol-to-bit mapping techniques Allows the use of binary convolutional codes (bcc) with MBCK; two codes investigated Rate 2/3 Punctured [133 171] – p133171 Rate 2/3 bcc (64 state trellis code) O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Soft Decision Decoding with MBCK March 2001 Soft Decision Decoding with MBCK Rate 2/3 code supports 22 and 29 Mb/s rates 22 Mb/s mode uses 64-ary BCK 29 Mb/s mode uses 256-ary BCK Both MBCK codes span 4 symbols No change in clocks, radio or baseband processor. O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Soft Decision Decoding with MBCK March 2001 Soft Decision Decoding with MBCK BER vs. Eb/N0 in the AWGN for bcc O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Soft Decision & MBCK – 22 Mb/s March 2001 Soft Decision & MBCK – 22 Mb/s BER vs. SNR for MBCK in the AWGN for p133171 and bcc (100 B/Pk) BER vs. SNR for MBCK in the AWGN for p133171 and bcc (100 B/Pk) O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Soft Decision & MBCK – 29 Mb/s March 2001 Soft Decision & MBCK – 29 Mb/s BER vs. SNR for MBCK in the AWGN for p133171 and bcc (100 B/Pk) O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Soft Decision & MBCK – Summary March 2001 Soft Decision & MBCK – Summary 22 Mb/s mode gives 1.25 dB coding gain over RS at 10-2 PER 29 Mb/s mode gives 2.25 dB coding gain over RS at 10-2 PER 64 state code offers enhanced PER performance for reasonable complexity O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

MBCK-BCC Encoding Chain March 2001 MBCK-BCC Encoding Chain 1 DATA IN xI 8 I OUT 1 6 Select 1 of 64 Sequences d BCC Encoder c xQ 1 Q OUT 32 Sequences + Complements rI 1 Rx I IN Soft Decision Metric 1 c’ 6 Viterbi Decoder y rQ 1 Rx Q IN DATA OUT M-ary Bi-Code Keying O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

8-ary BCK Example using Length 4 Quanternary Codes March 2001 8-ary BCK Example using Length 4 Quanternary Codes 000 100 1 3 1 3 3-1 3-1 1 3-1-3 3-1-3 1 -1-3-1-3 -3 1-3 1 -1-3 1 3 -3 1 3-1 1 3 1 3 -1-3-1-3 Quaternary Code LUT I/Q Tx Waveform I&D Greatest Peak Detector & Sign 20 -20 0 0 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 Data LUT Tx Function Rx Function O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.

Conclusions MBCK is a low complexity code that March 2001 Conclusions MBCK is a low complexity code that Meets the WLAN robustness criteria Is a mature concept based on MBOK Uses same radio as 802.11b Can be used with all equaliser types Can use Hard & Soft Decision FEC Is an inexpensive solution for WLANs A road map exists to achieve even higher data rates with MBCK O'Farrell, Aguado & Caldwell, Supergold Comm. Ltd.