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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: [ Modified pulse shapes based on SSA for interference mitigation and systems coexistence ] Date Submitted: [ November 10, 2003 ]

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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: [Modified pulse shapes based on SSA for interference mitigation and systems coexistence] Date Submitted: [November 10, 2003] Source: [Honggang Zhang, Ryuji Kohno ] Company [ (1) Communications Research Laboratory (CRL), (2) CRL-UWB Consortium ] Address [3-4, Hikarino-oka, Yokosuka, 239-0847, Japan] Voice:[+81-468-47-5101], FAX: [+81-468-47-5431], E-Mail:[honggang@crl.go.jp, kohno@crl.go.jp] Re: [IEEE P802.15 Alternative PHY Call For Proposals, IEEE P802.15-02/327r7] Abstract: [Various modifications of previously proposed SSA-UWB pulse wavelets are described, in order to realize global harmonization and compliance considering co-existence, interference avoidance, matching with regulatory spectral mask, and high data rate.] Purpose: [For investigating the interference mitigation and global co-existence between UWB and various other narrowband systems, based on the modified SSA pulse waveform shapes.] 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. CRL-UWB Consortium

  2. Modified Pulse Shapes Based on SSA for Interference Mitigation and Systems Coexistence Honggang ZHANG †, Ryuji KOHNO †‡ †Communications Research Laboratory(CRL) & CRL-UWB Consortium ‡Yokohama National University CRL-UWB Consortium

  3. Outline of presentation Summary of previously proposed SSA-UWB pulse waveforms Description of existing radio systems in Japan Modified pulse shapes for interference mitigation and global system coexistence　 Conclusion remarks Backup materials CRL-UWB Consortium

  4. SSA-UWB for global harmonization and compliance • Global harmonization and compliance is the everlasting aim and basic philosophy of CRL-UWB Consortium. • CRL’s SSA-UWBscheme has a wide capability to be harmonized with all the present or future UWB systems and co-exist with various narrowband radio systems. • Just changing the kernel functions and shapes of SSA-UWB pulse wavelets to achieve smooth version-up. CRL-UWB Consortium

  5. SSA-UWB philosophy • Design a proper pulse wavelet with high frequency efficiency corresponding to any regulatory frequency mask. • Adjust transmitted signal’s spectra adaptively, so as to minimize interference with co-existing systems. Soft-Spectrum Adaptation (SSA) CRL-UWB Consortium

  6. Features ofSSA-UWB • SSA-UWB with flexible pulse waveform and frequency band can be applied tosingle and multiband/multi-carrier UWB by  Free-verse typepulse waveform shapingand  Geometrical typepulse waveform shaping, respectively. • Interference avoidanceforco-existence, harmonizationfor various systems,andglobal implementation can be realized.  SSA-UWBcan flexibly adjust UWB signal spectrum so as to match with spectral restriction in transmission power, i.e. spectral masks in both cases ofsingleandmultiplebands. • Scalable, adaptive performance improvement. • Smooth system version-up similar to Software Defined Radio (SDR). CRL-UWB Consortium

  7. Exchangeable Modified SSA pulse Modified SSA pulse 5 GHz W-LAN Harmonized with each through Power 　Spectrum 1 4 5 6 8 9 10 11 2 3 7 f Dual- or three-band Multi-band or Multi-carrier SSA-UWB modified pulse wavelets CRL-UWB Consortium

  8. frequency [GHz] 3 4 5 6 7 8 9 10 Already-deployed radio systems in Japan Fixed Microwave Communication System Broadcasting System DSRC (Dedicated Short Range Communication) Radar System Satellite Communication System Amateur Radio WLAN and FWA Radio Astronomy CRL-UWB Consortium

  9. Regulatory frequency assignment by MPHPT, inJapan (almost no blank spectrum slot) CRL-UWB Consortium

  10. Radio Astronomy protection Radio emission prohibition dBm/MHz 5GHz 1GHz 10GHz Coexistence and compliance between the optimized SSA-UWB system and the existing radio systems with respect to the prohibited and inhibited band assignment in Japan CRL-UWB Consortium

  11. SSA-UWB optimized pulse wavelet generation Spectrum characteristics of SSA-UWB optimal pulse wavelet -0 1.5 -10 1 -20 -30 0.5 Relative amplitude (dB) Relative amplitude -40 -50 0 -60 -70 -0.5 -80 -90 -1 0 20 40 60 80 100 120 140 0 50 100 150 200 250 300 Time (samples) Frequency (samples) Modified SSA-UWB pulse wavelet with adaptive spectral notches achieving coexistence, flexibility and efficient power transmission CRL-UWB Consortium

  12. SSA-UWB optimized pulse wavelet generation Spectrum characteristics of SSA-UWB optimal pulse wavelet 1.5 0 -20 1 -40 -60 0.5 -80 Relative amplitude (dB) Relative amplitude -100 -120 0 -140 -160 -0.5 -180 -200 -1 0 50 100 150 200 250 300 0 20 40 60 80 100 120 140 Frequency (samples) Modified SSA-UWB pulse wavelet with adaptive spectral notches achieving coexistence, flexibility and efficient power transmission (Cont.) Time (samples) CRL-UWB Consortium

  13. SSA-UWB optimized pulse wavelet generation Spectrum characteristics of SSA-UWB optimal pulse wavelet 1 0 0.8 -20 0.6 -40 0.4 -60 Relative amplitude (dB) 0.2 Relative amplitude -80 0 -100 -0.2 -120 -0.4 -140 -0.6 20 40 60 80 100 120 140 -160 0 0 50 100 150 200 250 300 Time (samples) Frequency (samples) Modified SSA-UWB pulse wavelet with adaptive spectral notches achieving coexistence, flexibility and efficient power transmission (Cont.) CRL-UWB Consortium

  14. More dynamic band usage SSA-UWB with more flexible pulse wavelet combination and more dynamic band plan extension More flexible SSA wavelet CRL-UWB Consortium

  15. GPS Band 3.1 10.6 1.99 1.61 0.96 Global harmonization and compliance utilizing modified SSA-UWB pulse wavelets CRL-UWB Consortium

  16. Conclusion remarks • We has proposed the modified SSA-UWB pulse wavelets with dynamic pulse shaping and adaptive configuration. • SSA-UWB with flexible, dynamic pulse waveform shaping can satisfy the FCC spectral mask and other regional regulations around the world. • SSA-UWB can be applied to avoid possible interferences with other existing narrowband radio systems. • Scalable and adaptive performance improvement with multi-mode and multi-rate can be further expected by utilizing the modified SSA-UWB pulse wavelets. CRL-UWB Consortium

  17. Conclusion remarks (Cont.) • A SSA-UWB transmitter can use any kind of pulse wavelet, as long as the pulse used has a correlation within 3 dB of the reference RRC pulse in different pulse generation scheme. • This will allow manufacturers to design and use the transmitting pulse shapes to achieve either higher performance or higher levels of protection for specific bands or services (e.g. Japanese Radio Astronomy bands). • We can design receiving architectures such that transmitters and receivers from different manufacturers and even different regions will interoperate with minimal loss in performance. • Device pairs from the same or cooperating manufacturers could be further designed to optimize performance with each other. CRL-UWB Consortium

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