Oct 2005 doc IEEE 802 15 0600 004

Oct 2005 doc. : IEEE 802. 15− 0600− 004 a Project: IEEE P 802. 15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [FEC Options summary for TG 4 a ] Date Submitted: [30 -Sep-2005] Source: [Michael Mc Laughlin] Company [Decawave Ltd. ] Address [25 Meadowfield, Sandyford, Dublin 18, Ireland] Voice: [+353− 1− 2954937 ], FAX: [What’s a FAX? ], E−Mail: [michael@decawave. com] Re: [802. 15. 4 a. ] Abstract: [Summarises the current FEC proposals for TG 4 a forward error correction] Purpose: [To promote discussion in 802. 15. 4 a. ] Notice: This document has been prepared to assist the IEEE P 802. 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 P 802. 15. Submission 1 Mc Laughlin, Decawave

Oct 2005 doc. : IEEE 802. 15− 0600− 004 a FEC Options Coherent Receiver: Non Coherent Receiver: True Rate = ¼ Equivalent to Rate = ½ (Rate ¼ with erasures) FEC 1 SOC code K= 3, 4 or 5 R = 1/4 FEC 2 Convolutional Encoder K= 3, 4 or 5 R= 1/4 FEC 3 Convolutional Encoder K=3, R= 1/2 Systematic Convolutional Encoder K= 3, 4 or 5 R = 1/2 Coherent Receiver: Non Coherent Receiver: Concatenated code, Rate = ¼ Convolutional code, Rate = ½ FEC 4 BCH or RS GF(28): RS(40, 32) GF(26): RS(53, 43) Systematic Convolutional Encoder K= 3, 4 or 5 R = 1/2 Coherent Receiver: Non Coherent Receiver: Concatenated code Rate = 0. 4 RS code, Rate = 0. 8 FEC 5 Systematic Convolutional Encoder K= 3, 4 or 5 R= 1/2 Submission Coherent Receiver: Convolutional code Rate = ½ Non Coherent Receiver: Uncoded 2 Mc Laughlin, Decawave

Oct 2005 doc. : IEEE 802. 15− 0600− 004 a FEC vs Symbol rate • FEC Options have different code rates • Implies different Bit Rates, Symbol Rates and PRFs Submission 3 Mc Laughlin, Decawave

Oct 2005 doc. : IEEE 802. 15− 0600− 004 a Original Option I Coherent Modulation Proposal with Rate ½ FEC ~1000 ns 2 symbols transmitted every microsecond for 1 Mbit/s => 2 M sym/sec and average PRF = 16 MHz Submission 4 Mc Laughlin, Decawave

Oct 2005 doc. : IEEE 802. 15− 0600− 004 a Option III Modulation has 2 bits/symbol => FEC option 5 is now like this ~1000 ns 1 symbol transmitted every microsecond for 1 Mbit/s => 1 M sym/sec and average PRF = 8 MHz Submission 5 Mc Laughlin, Decawave

Oct 2005 doc. : IEEE 802. 15− 0600− 004 a FEC option 4 is like this ~1000 ns 1 symbol every microsecond. Data rate reduced to 800 kbit/s => 1 M sym/sec and average PRF = 8 MHz Submission 6 Mc Laughlin, Decawave

Oct 2005 doc. : IEEE 802. 15− 0600− 004 a Rate ¼ (FEC 1, FEC 2 and FEC 3) all need 4 bits / uncoded bit ~1000 ns 2 symbols transmitted every microsecond for 1 Mbit/sec => 2 M sym/sec and average PRF = 16 MHz Note: This is the same as for original modulation Option I Submission 7 Mc Laughlin, Decawave

Oct 2005 doc. : IEEE 802. 15− 0600− 004 a Summary of rates Submission 8 Mc Laughlin, Decawave