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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: [Some Answers about MPSK PHY layer Proposal ] Date Submitted: [Sept. 2007]

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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: [Some Answers about MPSK PHY layer Proposal ] Date Submitted: [Sept. 2007] Source: [Liang Li, Chen Yang Yang , T.T. Liu, Pei Liu, Dixon Paul] Company: [Vinno Technologies Inc, BUAA, Hisilicon Inc. ] Address: [Suite 402, Building D, No.2 Shangdi Xinxi Lu, Beijing 100085, China] Voice:[8610-82782373], FAX: [8610-82893004] E−Mail: [liangli@vinnotech.com, cyyangbuaa@vip.sina.com] Re: [802.15.4c] Abstract: [ ] Purpose: [To encourage discussion in 802.15.4c] 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. Liang Li (Vinno)

  2. .4c Currently Discussed Proposals Atmel, Freescale, Integration Associates • Joint proposal rebanding 900 MHz OQPSK PHY down to 779-787 MHz band (4 channels) & change pulse shaping filter Vinno, BUAA and Huawei : • New MPSK PHY, • Compatible to management and data structures, definitions of IEEE802.15.4-2006 Phy layer • RC shaping filter. • The difference on • MPSK Modulation, not OQPSK • PN Code table • Pre-processing. Liang Li (Vinno)

  3. CWPAN Major PHY D’s On the PN code, the detail Difference are: • PN Codes are circular shifted by 1 instead of by 2 • PN Codes 8-15 are not complex conjugates of PN Codes 0-7 • PN Codes are floating-point numbers instead of binary numbers • PN Codes are not DC free • Based on technical input/guidance from IEEE 802.15.4c changes were made by the CWPAN to remove the DC offset, by addition of a DC removal block Liang Li (Vinno)

  4. CWPAN Major PHY D’s (cont’d.) Mapping Data to PN Code • The sentence is misunderstanding: “The same mapping is not used for preamble, SFD and data payload” • The same mapping is used for Preamble, SFD and data Payload. • The SFD is the preamble through pre-processed after the same mapping. Modulation • M-ary PSK, Non Constant Envelope, Crest fact is 2.89dB. • As the OQPSK + RC pulse filter, waveform is not Constant Envelope. Crest fact is about 1.0dB. Liang Li (Vinno)

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