Date Submitted: [18 March 2004] Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Scaling-TG3a-PHY-Proposals-for-High-Aggregate-Data-Rates] Date Submitted: [18 March 2004] Source: [Matt Welborn] Company [Motorola] Address [8133 Leesburg Pike Vienna, VA USA] Voice:[703-269-3000], E-Mail:[mwelborn@xtremespectrum.com] Re: [] Abstract: [A proposal for a common frequency plan for DS-UWB and MB-OFDM to enable a common signaling mode] Purpose: [Provide technical information to the TG3a voters regarding a possible common signaling mode compromise] 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. Welborn Motorola

Outline Scaling baseline PHY modes Higher frequency bands March 2004 Outline Scaling baseline PHY modes Higher frequency bands Higher data rates Welborn Motorola

DS-UWB Operating Bands March 2004 DS-UWB Operating Bands Low Band High Band 3 4 5 6 7 8 9 10 11 3 4 5 6 7 8 9 10 11 GHz GHz MB-OFDM Operating Bands Welborn Motorola

Multi-piconet Overview March 2004 Multi-piconet Overview DS-UWB low band and high band 2x center frequency & BW in high band Support for 6 piconets in each of low band and high band MB-OFDM has added full FDM support for multiple piconets using band groups New band groups have higher frequencies All use same TFCs For both proposals, higher frequency bands will experience worse RF losses Likely higher receiver noise figures Welborn Motorola

Multipath Ranges for 110 Mbps March 2004 Multipath Ranges for 110 Mbps * * Band group 5 has 2 bands  rate or range is lower Welborn Motorola

Assumptions for Comparison March 2004 Assumptions for Comparison Assumptions for multiple piconet support All piconets >5GHz assumed to have +2dB NF Assume multipath ranges reduced by 20*Log(Fc ratio) All piconets are outside UNII except Band Group 2 UNII devices ~30dB higher transmit power 802.11a, cordless phone, TDWR, DSRC… Typical UNII device within about 100-200m of BG2 piconet will degrade sensitivity 6dB (~½ range) Assumes erasure decoding present to partially mitigate UNII RFI Dynamic UNII protection may increase NF/BOM (03/141r3, p.12) Seems unlikely that this would be acceptable to user/OEM Does not meet selection criteria of <1 m for 802.11a separation Assumptions about acceptable distance ratio, 2 cases Distance ratio of <=1.5 is required for multi-piconet support Distance ratio of <=1.0 is required for multi-piconet support Assumes adequate adjacent band/band group isolation Welborn Motorola

Piconets & Multipath Range March 2004 Piconets & Multipath Range Band Group 2 shown degraded 6 dB (UNII Device at 100-200 m) Band Group 4 With 2 “piconets” Welborn Motorola

Piconets & Multipath Range March 2004 Piconets & Multipath Range Band Group 2 shown degraded 6 dB (UNII Device at 100-200 m) Band Group 4 With 1 “piconets” Welborn Motorola

DS-UWB scaling to Higher Rates March 2004 DS-UWB scaling to Higher Rates There is significant interest in “cable replacement” applications that require high speed operation (480+ Mbps) at short range DS-UWB operation at 500 Mbps uses L=2 code & ¾ FEC Complexity is similar DS-UWB receiver for 110 & 220 Mbps Same ADC bit widths & clock rates Same rake bit width & complexity Fewer rake taps available (only 2/3 as many as for 220 Mbps) Viterbi decoder for k=6, rate ¾ likely 2x gates  45k gate increase Operation at 660 Mbps also supported with un-coded operation 4.9 m range in fully impaired AWGN simulation Eliminates requirement for high speed Viterbi decoder Complete, fully impaired multipath simulations for 500-1000 Mbps DS-UWB are underway Welborn Motorola

MB-OFDM scaling to Higher Rates March 2004 MB-OFDM scaling to Higher Rates Currently available complexity estimates for MB-OFDM implementations do not support operation at > 200 Mbps Document 267r5, p. 35 Estimated MB-OFDM receiver complexity scaling for 480 Mbps 5-bit ADC required instead of 4-bit ADC at lower rates (Doc# 03/267) Increased bit-width for internal FFT processing 45 bits is 25% increase  assume 25% higher gate count (conservative) This scales FFT engine from 70-100k gates to 90-125k gates @ 85 MHz 25k gate increase over current estimates for 200 Mbps implementation K=7 Viterbi decoder does not operate at 480 Mbps SiWorks (Document 03/213r0) estimates that 480 Mbps, k=7 operation would be possible, but would require a 4-wide parallel implementation SiWorks estimate for 200 Mbps k=7 Viterbi is 75k gates at 100 MHz Equivalent to 88 k gates at 85.5 MHz SiWorks estimate for 480 Mbps is 110K gates at 120 MHz  154k gates at 85.5 MHz (about 2x the <=200 Mbps Viterbi complexity) K=7 Viterbi decoder would require an increase of 80k gates @ 85MHz Welborn Motorola

DS-UWB & MB-OFDM Complexity Scaling March 2004 DS-UWB & MB-OFDM Complexity Scaling Complexity increase for MB-OFDM receiver Increase for FFT & Viterbi is >100k gates @ 85 MHz Total complexity now >550 k gates at 85.5 MHz Based on estimate of 295k gates at 132 MHz Complexity increase for DS-UWB receiver Increase in gate count due only to Viterbi decoder, 54k gates Total receiver complexity now ~230 k gates at 85.5 Mhz For un-coded operation at 660 Mbps, no Viterbi decoder Power consumption equivalent to 130 k gates at 85.5 MHz DS-UWB digital baseband complexity is only ~30-40% of the equivalent MB-OFDM implementation Welborn Motorola