March 2004 doc IEEE 802 15 04164 r

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March 2004 doc. : IEEE 802. 15 -04/164 r 0 Project: IEEE P 802.

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Project: IEEE P 802. 15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Scaling-TG 3 a-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 TG 3 a voters regarding a possible common signaling mode compromise] Notice: This document has been prepared to assist the IEEE P 802. 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 P 802. 15. Submission 1 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Outline • Scaling baseline

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Outline • Scaling baseline PHY modes – Higher frequency bands – Higher data rates Submission 2 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 DS-UWB Operating Bands Low

March 2004 doc. : IEEE 802. 15 -04/164 r 0 DS-UWB Operating Bands Low Band 3 4 5 6 7 8 High Band 9 10 11 GHz 3 4 5 6 7 8 9 10 11 GHz MB-OFDM Operating Bands Submission 3 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Multi-piconet Overview – DS-UWB

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Multi-piconet Overview – DS-UWB low band high band • 2 x center frequency & BW in high band • Support for 6 piconets in each of low band 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 Submission 4 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Multipath Ranges for 110

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Multipath Ranges for 110 Mbps * * Band group 5 has 2 bands rate or range is lower Submission 5 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Assumptions for Comparison •

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Assumptions for Comparison • Assumptions for multiple piconet support – All piconets >5 GHz assumed to have +2 d. B NF – Assume multipath ranges reduced by 20*Log(Fc ratio) – All piconets are outside UNII except Band Group 2 • UNII devices ~30 d. B higher transmit power – 802. 11 a, cordless phone, TDWR, DSRC… • Typical UNII device within about 100 -200 m of BG 2 piconet will degrade sensitivity 6 d. B (~½ range) – Assumes erasure decoding present to partially mitigate UNII RFI • Dynamic UNII protection may increase NF/BOM (03/141 r 3, p. 12) • Seems unlikely that this would be acceptable to user/OEM • Does not meet selection criteria of <1 m for 802. 11 a 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 Submission 6 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Piconets & Multipath Range

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Piconets & Multipath Range Band Group 2 shown degraded 6 d. B (UNII Device at 100 -200 m) Band Group 4 With 2 “piconets” Submission 7 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Piconets & Multipath Range

March 2004 doc. : IEEE 802. 15 -04/164 r 0 Piconets & Multipath Range Band Group 2 shown degraded 6 d. B (UNII Device at 100 -200 m) Band Group 4 With 1 “piconets” Submission 8 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 DS-UWB scaling to Higher

March 2004 doc. : IEEE 802. 15 -04/164 r 0 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 2 x gates 45 k 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 Submission 9 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 MB-OFDM scaling to Higher

March 2004 doc. : IEEE 802. 15 -04/164 r 0 MB-OFDM scaling to Higher Rates • Currently available complexity estimates for MB-OFDM implementations do not support operation at > 200 Mbps – Document 267 r 5, 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 -100 k gates to 90 -125 k gates @ 85 MHz • 25 k gate increase over current estimates for 200 Mbps implementation – K=7 Viterbi decoder does not operate at 480 Mbps • Si. Works (Document 03/213 r 0) estimates that 480 Mbps, k=7 operation would be possible, but would require a 4 -wide parallel implementation • Si. Works estimate for 200 Mbps k=7 Viterbi is 75 k gates at 100 MHz – Equivalent to 88 k gates at 85. 5 MHz • Si. Works estimate for 480 Mbps is 110 K gates at 120 MHz 154 k gates at 85. 5 MHz (about 2 x the <=200 Mbps Viterbi complexity) • K=7 Viterbi decoder would require an increase of 80 k gates @ 85 MHz Submission 10 Welborn Motorola

March 2004 doc. : IEEE 802. 15 -04/164 r 0 DS-UWB & MB-OFDM Complexity

March 2004 doc. : IEEE 802. 15 -04/164 r 0 DS-UWB & MB-OFDM Complexity Scaling • Complexity increase for MB-OFDM receiver – Increase for FFT & Viterbi is >100 k gates @ 85 MHz – Total complexity now >550 k gates at 85. 5 MHz • Based on estimate of 295 k gates at 132 MHz • Complexity increase for DS-UWB receiver – Increase in gate count due only to Viterbi decoder, 54 k 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 ~3040% of the equivalent MB-OFDM implementation Submission 11 Welborn Motorola