1. Submission Title: [Rate one over four code for TG4a]
Sep 2005
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Rate one over four code for TG4a]
Date Submitted: [22-Sep-2005]
Source: [Michael Mc Laughlin] Company [Decawave Ltd.]
Address [25 Meadowfield, Sandyford, Dublin 18, Ireland]
Voice:[+353−1− ], FAX: [What’s a FAX?], E−Mail:
Re: [ a.]
Abstract: [Proposes a FEC scheme for TG4a data]
Purpose: [To promote discussion in a.]
Notice: This document has been prepared to assist the IEEE P 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
Mc Laughlin, Decawave

2. Sep 2005
Rate ¼ Coherent
Non Coherent mode: Use rate ¼ convolutional code punctured to rate ½ for non-coherent receivers
- Convolutional code: dfree=15, k=5
g1=25, g2=12, g3=23, g4=16
# parallel paths=1
Mc Laughlin, Decawave

3. Coherent Receiver g1=25, g2=12, g3=23, g4=16 # parallel paths=1
Sep 2005
Coherent Receiver
g1=25, g2=12, g3=23, g4=16
# parallel paths=1
Mc Laughlin, Decawave

4. about 0.6dBs better than rate 1/2
Sep 2005
Coherent Performance
about 0.6dBs better than rate 1/2
Mc Laughlin, Decawave

5. Non Coherent Receiver g2=12, g4=16 => Rate ½ K=4 dfree = 5
Sep 2005
Non Coherent Receiver
g2=12, g4=16 => Rate ½ K=4
dfree = 5
expect about 3.5dBs performance improvement over uncoded
8 state decoder
Mc Laughlin, Decawave

6. Rate ¼ need 4 bits / uncoded bit
Sep 2005
Rate ¼ need 4 bits / uncoded bit
~1000ns
2 codes transmitted every microsecond
Mc Laughlin, Decawave

7. Original Option 1 Proposal
Sep 2005
Original Option 1 Proposal
~1000ns
2 codes transmitted every microsecond
Mc Laughlin, Decawave