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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [TG3a-Wisair-CFP-Presentation] Date Submitted: [3 March, 2003] Source: [Gadi Shor] Company: [Wisair] Address: [24 Raoul Wallenberg st. Ramat Hachayal, Tel-Aviv, ISRAEL]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [TG3a-Wisair-CFP-Presentation] Date Submitted: [3 March, 2003] Source: [Gadi Shor] Company: [Wisair] Address: [24 Raoul Wallenberg st. Ramat Hachayal, Tel-Aviv, ISRAEL] Voice: [+972-3-7676605] FAX: [+972-3-6477608], E-Mail: [gadi.shor@wisair.com] Re: [802.15.3a Call for proposal] Abstract: [Wisair’s presentation for the P802.15.3a PHY standard] Purpose: [Response to WPAN-802.15.3a Call for Proposals] 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. Gadi Shor, Wisair

  2. Wisair’s Variable-Pulse-Rate Multi-BandPHY layer Proposal for TG3a Gadi Shor, Yaron Knobel, David Yaish, Sorin Goldenberg, Amir Krause, Erez Wineberger, Rafi Zack, Benny Blumer, Zeev Rubin, David Meshulam, Amir Freund Wisair Gadi Shor, Wisair

  3. Contents • Targets • Main Features • Physical layer • Implementation and Feasibility • MAC enhancements • Performance • Self Evaluation • Conclusions Gadi Shor, Wisair

  4. Targets • Proposal for high bit-rate Multi-Band PHY layer for 802.15.3 MAC • Support applications with wireless transmission of Audio/Video and High-Rate data communication • Allow cost effective, low power implementation on chip Gadi Shor, Wisair

  5. Contents • Targets • Main Features • Physical layer • Implementation and Feasibility • MAC enhancements • Performance • Self Evaluation • Conclusions Gadi Shor, Wisair

  6. Main Features • Variable-Pulse-Rate Multi-band PHY • Flexible (use 1->14 sub-bands out of 30) • World-wide regulation • Co-existence with current and future systems • Interference mitigation • Scalable (Variable pulse repetition frequency) • 20 to 1000 Mbps • Reduced ADC sampling rate at lower Bit-rate • Power consumption vs. Bit-rate trade off • Support 802.15.3 MAC without modifications, only enhancements • Support all selection criteria Gadi Shor, Wisair

  7. Contents • Targets • Main Features • Physical layer • Implementation and Feasibility • MAC enhancements • Performance • Self Evaluation • Conclusions Gadi Shor, Wisair

  8. Variable-Pulse-Rate Multi-Band PHY layer • Sub-bands frequency plan • Pulse shape • Operation modes • Variable-Pulse-Rate time-frequency interleaving sequences Gadi Shor, Wisair

  9. Frequency Plan Consideration Points Consideration points : • FCC mask • In band mask – 3.1-10.6 GHz • Indoor FCC mask require 10db attenuation at 3.1GHz rejection • Outdoor FCC mask require 20db attenuation at 3.1GHz rejection • 802.11a Frequency range : • US & Canada: 5.15 - 5.350GHz & 5.725 - 5.825GHz • Japan: 4.9-5GHz ,5.15 - 5.25GHz • Europe: 5.15 - 5.35GHz & 5.47 - 5.725GHz Gadi Shor, Wisair

  10. Multi-Band Frequency-Plan • Sub-bands are spaced 470 MHz apart • For flexible co-existence and simple implementation • Each sub band is generated by a pulse with 10 dB bandwidth of ~520 MHz • Supports FCC requirements Gadi Shor, Wisair

  11. Two overlapping frequency groups (A, B) • A Second group overlap the first group 235 MHz aside • enhance system flexibility with respect to co-existence, interference mitigation and multiple access Gadi Shor, Wisair

  12. Upper and Lower Sub-Band Sets • Each group is divided into lower (sub-bands 1-8) and upper (sub-bands 9-15) sets • Only 7 sub-bands are used in the lower set • One sub-band can be avoided for co-existence • The upper set is used in parallel to the lower set to increase the bit-rate • First generation support lower set • Next generation devices has backward compatibility Gadi Shor, Wisair

  13. Signal spectrum: Group A - Lower Set(ADS Simulation) • The sub-bands are divided into a lower set (lower 8 sub-bands) and an upper set (higher 7 sub-bands) Gadi Shor, Wisair

  14. Co-existence • Center frequencies selected to allow elimination of one sub-band per region • Only 7 sub-bands are used in the lower set according to the region Gadi Shor, Wisair

  15. Co-existence • Only 7 sub-bands out of 8 are used in the lower set according to the region Gadi Shor, Wisair

  16. Co-existence (US) • US Co existence with 802.11a: avoid one of the Sub Channels: 4a,5a,5b,6b Gadi Shor, Wisair

  17. Co-existence (US) • Example: Avoid sub band 6b Gadi Shor, Wisair

  18. Co-existence (Europe) • Europe Co existence with 802.11a: avoid one of the Sub Channels: 4a,5a,5b,6b Gadi Shor, Wisair

  19. Co-existence (Europe) • Example: Avoid sub band 5a Gadi Shor, Wisair

  20. Co-existence (Japan) • Japan Co existence with 802.11a: avoid one of the Sub Channels: 4a,4b Gadi Shor, Wisair

  21. Co-existence (Japan) • Example: Avoid sub band 4a Gadi Shor, Wisair

  22. Variable-Pulse-Rate Multi-BandModulation and Coding Scheme • The waveform is generated by time interleaving of pulses from different frequency sub-bands • Modulation schemes: QPSK and BPSK • Coding Schemes: Viterbi K=7, Rate ½, ¾ • Three pulse repetition intervals supported to allow • Reduced ADC sampling rate for improved power consumption • Improved multiple access • Improved ISI mitigation • Energy collection Gadi Shor, Wisair

  23. Variable-Pulse-Rate Multi-Band • Pulse repetition interval per sub-band is longer than channel response • 28 nSec: 7 pulses ~3.9 nSec each with 250 Mpps • 56 nSec: 7 pulses ~3.9 nSec each with 125 Mpps • 84 nSec: 7 pulses ~3.9 nSec each with 83.3 Mpps • Reduce sampling rate for reduced bit rates Gadi Shor, Wisair

  24. 125 Mpps signal example(ADS simulation) • Any number of sub-bands (N<=7) can be used • Unused sub-bands are not transmitted • Example shows 4 sub-bands in use Gadi Shor, Wisair

  25. Multi-band signal generation • Above 500 Mbps the upper band optional section (Gray section) may be used to allow up to 1000 Mbps Gadi Shor, Wisair

  26. 3.9 nSec 4.0 nSec Pulse Shape Pulse shape defines the envelope of the pulse Gadi Shor, Wisair

  27. Operation Modes (7 bands example) Gadi Shor, Wisair

  28. Bit rates vs. Number of sub-bands • In each operation mode different number of sub-bands can be used • The table shows Bit-Rates for different number of sub-bands under different operation modes • Mode 5 with 7 sub-bands supports 125Mbps (Meets IEEE 110Mpbs requirement) • Mode 3 with 7 sub-bands supports 250Mbps (Meets IEEE 200Mpbs requirement) • Mode 1 with 7 sub-bands supports 500Mbps for scalability • Mode 8 is used for the beacon, same information is transmitted over all sub-bands Gadi Shor, Wisair

  29. Time-Frequency interleaving sequences • Each piconet uses a different time-frequency interleaving sequence of length 7 • The “same” sequence is used for the upper frequency set (in parallel to the lower set ) • The set is used according to the sequence, the mode of operation and the number of sub-bands to be used Gadi Shor, Wisair

  30. Collision Example: S1 and S2 • Only one collision for every possible time offset Gadi Shor, Wisair

  31. Variable-rate Time-Frequency interleaving sequences • Example for 7 sub-bands using S2 in the different operation modes: 250, 125 and 83.3 Mpps • Preserve time-frequency sequences collision properties for all modes • Reduce multi-path effect on collision between Piconets • Improve multi-path mitigation and enable energy collection Gadi Shor, Wisair

  32. Variable Rate Time Frequency interleaving sequences • Example for 4 sub-bands using S2 in the different operation modes: 250, 125 and 83.3 Mpps • For lower number of sub-bands only relevant sub-bands are used • Preserve the collision properties for any number of sub-bands Gadi Shor, Wisair

  33. Multiple-Access • Use of different time-frequency interleaving sequences in different Piconets to reduce collisions • Reduce number of channels in use, to reduce collisions (FDM alternative when link budget good enough) • Reduce pulse repetition frequency to reduce multi-path effects on Multiple access Gadi Shor, Wisair

  34. Preamble • Use CAZAC sequences over all sub-bands in use (Similar to mode 8) • Approximately 10 Micro Seconds • Achieve False-Alarm and Miss-Detect requirements under multi-path and multiple access interference • Use color code to improve Piconet identification Gadi Shor, Wisair

  35. Contents • Targets • Main Features • Physical layer • Implementation and Feasibility • MAC enhancements • Performance • Self Evaluation • Conclusions Gadi Shor, Wisair

  36. Block Diagram – Analog Section Gadi Shor, Wisair

  37. Block Diagram – Digital Section Coded bits are being spread over the different sub-bands Gadi Shor, Wisair

  38. Technical Feasibility Establish wireless link using prototype: 15Mbps @ 30 meters 30Mbps @ 25 meters 60Mbps @ 18 meters Gadi Shor, Wisair

  39. Size The size was calculated using SiGe process with fT=60GHz for the analog blocks and 0.13 CMOS process for the digital blocks. The size includes pads overhead. Gadi Shor, Wisair

  40. Main Modes: Bit Rates versus Power Consumption and Link Margin Less than 1 mWatt per 1 Mbps Gadi Shor, Wisair

  41. Contents • Targets • Main Features • Physical layer • Implementation and Feasibility • MAC enhancements • Performance • Self Evaluation • Conclusions Gadi Shor, Wisair

  42. PHY Mapping on current 802.15.3 MAC • The proposed PHY can be used with the current MAC without modifications • Piconet channel is represented by a Time–Frequency interleaving seed sequence • Each Piconet choose a different seed sequence (channel) • Devices in the same piconet use the same seed sequence (channel) Channel = Sequence • The Piconet beacon frames are transmitted over all sub-bands • This is done transparently to the MAC (using PHY mode 8) Gadi Shor, Wisair

  43. Location Awareness • Special command frame that support Time Advanced measurement between two Piconet devices • Two devices exchange two messages • Dev A to Dev B: Send time A • Dev B to Dev A: Time Diff A(Receive Time A - Send Time A ) and Send Time B • Dev A calculates • Time Diff B (Receive Time B - Send Time B ) • Time between Dev A to Dev B = ½ (Diff A + Diff B) Gadi Shor, Wisair

  44. Contents • Targets • Main Features • Physical layer • Implementation and Feasibility • MAC enhancements • Performance • Self Evaluation • Conclusions Gadi Shor, Wisair

  45. Link Budget (7 sub-bands) Positive link margins for main modes Gadi Shor, Wisair

  46. Performance under multi-path conditionWithout Equalizer • Bit rate: 125 Mbps (Mode 5) • Number of bands: 7 • Simulating 400 channel realizations • For each point either 250 packets or 21 packet errors were used • Results represent statistics of 5 Gbits • Note: Shadow parameter in channel model is very dominant Gadi Shor, Wisair

  47. 125 Mbps LOS 0-4 (CM1)(with Shadow) Gadi Shor, Wisair

  48. 125 Mbps LOS 0-4 (CM1)(No Shadow) Gadi Shor, Wisair

  49. 125 Mbps LOS 0-4 (CM1) Statistics(With Shadow) Gadi Shor, Wisair

  50. 125 Mbps CM1-4 Statistics(90% Average PER with Shadow) Gadi Shor, Wisair

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