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Project: IEEE 802.15 Study Group for Wireless Personal Area Networks (WPANs) Submission Title: [ An Alternativetive Concatenated Code Option for TG4a ] Date Submitted: [November 2005] Source: [Shahriar Emami and Celestino A. Corral]: Company1 [Freescale Semiconductor]

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Project: IEEE 802.15 Study Group for Wireless Personal Area Networks (WPANs)

Submission Title: [An Alternativetive Concatenated Code Option for TG4a]

Date Submitted:[November 2005]

Source: [Shahriar Emami and Celestino A. Corral]:

Company1 [Freescale Semiconductor]

Address [Freescale Semiconductor, Inc. 6100 Broken Sound Pkwy., N.W. Suite 1

Boca Raton, FL  33487-2790]

Voice: [(561) 544-4064]

Re: [802.15.4a]

Abstract: [Captures the characteristics of TG4a coding schemes.]

Purpose: [To assist designers in coding selection]

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.

Shahriar Emami, Freescale Semiconductor

option i modulation ieee 15 05 617 01 004a
Option I: Modulation[IEEE 15-05-617-01-004a]

2 PPM

Shahriar Emami, Freescale Semiconductor

option ii modulation ieee 15 05 617 01 004a
Option II: Modulation [IEEE 15-05-617-01-004a]

4 PPM

Shahriar Emami, Freescale Semiconductor

option iii modulation ieee 15 05 617 01 004a
Option III: Modulation [IEEE 15-05-617-01-004a]

8 PPM

Shahriar Emami, Freescale Semiconductor

non coherent receiver performance in awgn
Non-Coherent Receiver Performance in AWGN

Options I,II and III achieve EbNo of 12.5, 9.8 and 8 dB for 1% PER.

Option III is superior to others

Shahriar Emami, Freescale Semiconductor

option iii b coding performance ieee 15 05 617 01 004a
Option III-b: Coding & Performance [IEEE 15-05-617-01-004a]

Among all options, option III-b achieves the best performance

Non-coherent Rx. achieves 1% PER at EbNo = 5.75 dB

Shahriar Emami, Freescale Semiconductor

rs code block size
RS Code Block Size
  • In many sensor networks very few information bits are transmitted at a time.
  • Short packets need to be stuffed with zeros to reach minimum RS code block size.
  • RS code would be wasteful for these applications.

Shahriar Emami, Freescale Semiconductor

option iii c
Option III-c
  • Replace RS (51,43) code with a rate 5/6 convolutional code

- Rs code rate 0.843

- Convolutional code rate 0.833

  • Rate 5/6 convolutional code can be obtained by puncturing rate ½ code with puncturing matrix P=[ 10100;11011 ].

Shahriar Emami, Freescale Semiconductor

non coherent receiver performance of iii c in awgn
Non-Coherent Receiver Performance of III-c in AWGN

Hard decision III-c performance is shown above

With soft Decision III-c performance will be as good as III-b

Shahriar Emami, Freescale Semiconductor