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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: [ Merged DSSS Proposal for TG4g] Date Submitted: [ September 18, 2009]

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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: [Merged DSSS Proposal for TG4g] Date Submitted: [September 18, 2009] Source:[Kuor Hsin Chang, Scott Weikel, Clint Powell, & Rick Enns, Seong-Soon Joo, Tae-Joon Park, Wun-Cheol Jeong, Jong-Suk Chae] Company: [Elster Electricity, Consultants, ETRI] Address: [] Voice: [KC:+1.919.901.2377, SW:+1.919.212.4866, CP:+1.480.586.8457, RE:+1.650.327.9708, SSJ: +82-42-860-6333, TJP: +82-42-860-6902, WCJ: +82-42-860-5104, JSC: +82-42-860-6480] E-Mail:[kuor-hsin.chang@us.elster.com, scott.j.weikel@us.elster.com, cpowell@ieee.org, enns@stanfordalumni.org, ssjoo@etri.re.kr, tjpark@etri.re.kr, wjeong@etri.re.kr, jschae@etri.re.kr] Re: [] Abstract: Merged Proposal for a 802.15.4 radio based on a flexible DSSS Purpose: Presented to the 802.15.4g SUN Task Group for consideration 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.

  2. Merged Proposal for DSSS to TG4g Kuor Hsin Chang (Elster Electricity) Scott Weikel (Elster Electricity) Clint Powell (Consultant) Rick Enns (Consultant) Seong-Soon Joo (ETRI) Tae-Joon Park (ETRI) Wun-Cheol Jeong (ETRI) Jong-Suk Chae (ETRI)

  3. Merged Proposal • Oveview • Extend the existing 802.15.4-2006 PHY to serve the application in SUN network • Add CA-CDM (Constant Amplitude Code Division Multiplex) option to improve the performance of the link in low and high data rate • The DSSS merged proposal is supported by: • Elster Electricity : Kuor Hsin Chang , Scott Weikel • Consultant : Clint Powell, Rick Enns • ETRI : Seong-Soon Joo, Tae-Joon Park, Wun-Cheol Jeong, Jong-Suk Chae

  4. Agenda • Requirements • Details about merged proposal • Band plan and channelization • System Parameters • Frame format: preamble, header, PSDU • TX/RX architecture • Performance results • System performance in multi-path • Summary and conclusions

  5. Flexible DSSS Proposal • Provide configuration options for the number of chips per symbol and bits per symbol while keeping the chip rate constant at 1Mcps / 2 Mcps • Optimize performance for range and data rate – long range at reduced data rate and short range at high data rate

  6. Flexible DSSS Examples for 2.4 GHz * Under Review

  7. PN Codes & Chip to Symbol Mapping: • Data Rate of 62.5 kbps • Data Rate of 125 kbps • Data Rate of 250 kbps (2.4 GHz PHY in IEEE 802.15.4-2006)

  8. PN Codes & Chip to Symbol Mapping (cont’d.) • Data Rate of 500 kbps

  9. Flexible DSSS(CA-CDM) Examples for 900 MHz * Under Review

  10. Spreading sequence for 16 chips per symbol(500Kbps) • Spreading sequence for 64 chips per symbol (125/62.5 Kbps) • Spreading sequence for 32chips per symbol (250Kbps)

  11. Packet Structure • Extend the Frame Length Field (PHR) of 802.15.4 packet from one byte to two bytes in order to support the packet length to be up to 1500 bytes. • Use bit 15 (bit 7 of the Frame Control Field) of the PHR to determine long packet (≥127 bytes) or short packet (≤127 bytes)

  12. Packet Length Field • Maximum packet length of 2047 bytes. • Use Bit 11-12 to determine data rate:

  13. Packet Length Field (cont’d.) • Bit 13: Parity Check bit for packet length to avoid unnecessary receiver power consumption due to errors in packet length • Bit 15: • 0: Short Packet (Packet Length to be ≤ 127 bytes) • 1: Long Packet (127 bytes < Packet Length ≤ 2047 bytes)

  14. Compliance to the PAR

  15. CA-CDM • Multiplexing multi-channels into a two-level single channel • Mitigating the requirements for Power amplifier by reducing PAPR • Minimizing the performance loss due to the two-level conversion by exploiting odd-parity check encoded data

  16. Advantages of Making DSSS Flexible • Easy chip design – keeps the chip rate set at what 802.15.4-2006 uses. The design of the front end of the current chips can be used. • Simple- we know the radio and this is well understood extension to only the digital side. • Known coexistence properties – transmissions look the same to other radios.

  17. Backup

  18. CA-CDM Transmitter • Block diagram of CA-CDM Transmitter

  19. CA-CDM Transmitter • Odd-Parity Check Code Encoder

  20. CA-CDM Transmitter • Hadamard Modulation (Reed-Muller Encoding) • Symbol mapping

  21. CA-CDM Transmitter • (16,4) Hadamard Spreading

  22. CA-CDM Transmitter • Bitwise XOR

  23. CA-CDM Receiver • CA-CDM Receiver Block Diagram

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