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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: [FEC Related Comment resolutions for LB70] Date Submitted: [May 9, 2011] Source: [Alina Liru LU, Hiroshi Harada , Ryuhei Funada , Fumihide Kojima, Chin-Sean Sum] Company [NICT]

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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: [FEC Related Comment resolutions for LB70] Date Submitted: [May 9, 2011] Source:[Alina Liru LU, Hiroshi Harada, Ryuhei Funada, Fumihide Kojima, Chin-Sean Sum] Company [NICT] Address [3-4, Hikarino-oka, Yokosuka, 239-0847, Japan] E-Mail: [liru@nict.com.sg; harada@nict.go.jp] Re: [] Abstract: [This document provides resolutions to comments for FSK] Purpose: [This document provides resolutions to comments of LB #70] 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. CID 44 • Comment: • Information on data whitening is in conflict with Viterbi decoding, since the PHR filed is not terminated. • Commenter request resolution • Ideally, terminate the PHR in case FEC is enabled. Alternatively, always enable data whitening. • Response: • Reject. • Reason: At the receiver side, the data-whitening is decoded before FEC Viterbi decoding. Hence, there should not be the mentioned conflict with Viterbi decoding for data whitening

  3. CID 156 • Comment: • The DW bit is part of the PHR field. In case of FEC, this is awkward while Viterbi decoding the frame since PSDU code-bit data whitening is performed after FEC and the PHR field is not terminated. A Viterbi decoder may have to trace two hypothesis (DW is either 0 or 1) in order to exploit sufficient trace back length (especially when decoding the length field). This doubles the number of trellis states. Future usage of the reserved bits is very limited. • Commenter request resolution • Ideally, terminate the PHR in case FEC is enabled. All PHR information bits (including reserved bits) can be be decoded with high reliability and their decisions are not influenced by PSDU code-bits. Alternatively, always enable data whitening. • Response: • Reject • Reason: At the receiver side, the data-whitening is decoded before FEC Viterbi decoding. Hence, there should not be the mentioned conflict with Viterbi decoding for data whitening

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