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Modulation for TG4a

This document proposes a modulation scheme for TG4a in the IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) to assist in the selection of a modulation scheme.

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Modulation for TG4a

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Modulation for TG4a] Date Submitted: [19 July 2005] Source: [Ismail Lakkis & Saeid Safavi, Wideband Access Inc.] Contact: Saeid Safavi. Voice:[+1 858 642 9114, E-Mail: ssafavi@widebandaccess.com] Abstract: [Modulation proposal] Purpose: [To assist the group in the selection of a modulation scheme] 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. Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  2. Agenda • PRF & Peak Power • BER in AWGN • Proposed Modulation Scheme • Proposed System Parameters • Simulation Results Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  3. PRI VPeak TC Relationship between PRF & Peak Power Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  4. Minimum PRF vs Peak Power (CMOS 90nm) Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  5. BER In AWGN • The requirement of PER < 1% for a 32 octets packet translates into a BER < 3.926e-5 • EbN0 requirements for uncoded BPSK and ON-OFF keying systems: • g (BPSK) = 8.9 dB • g (ON-OFF) = 15.45 dB • EbN0 requirements for coded BPSK and ON-OFF keying systems: • g (BPSK) = 4 dB • g (ON-OFF) = 10 dB Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  6. Modulation • Spreading via scrambling • Scrambling = time varying spreading • Use a single (set) scrambler of length (ex: 32768) and assign a different offset (of 16 or 32) to different nodes • Number of users supported is 1024 • Perfect co-channel interference rejection • Support virtually any data rate from ~16MHz to 32 Kbps for a PRF of ~16MHz • Spectrum is virtually flat (no back-off) Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  7. Ternary Modulator I • Orthogonal time varying spreading • Supports coherent, differentially • coherent & non-coherent Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  8. Ternary Modulator I • Binary time varying spreader • In one symbol either the code or –code is sent • Option for coherent detectors Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  9. Ternary Modulator II If a guard of 2 pulses is used: Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  10. Ternary Receiver: Non-Coherent Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  11. Receiver Structure Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  12. Proposed System Parameters Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  13. Simulation Assumptions • PRF : 15.4375 MHz • Effective Data Rate ~ 1 MHz • Channel Coding : Rate ½ Conv. (K = 5) • Frame/Frequency : Assume perfect sync • Channel estimation : not perfect • Uncoded Packet Length : 32 octets Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  14. Simulation Results (Coherent) Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  15. Simulation Results (Coherent) Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

  16. Simulation Results (Non-Coherent) Ismail Lakkis & Saeid Safavi Wideband Access, Inc.

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