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Design of IRA Codes for Non-Coherent Detection With OFDM

Overview Irregular Repeat Accumulate (IRA) codes are a special class Of Low-Density Parity-Check (LDPC) codes which perform very close to capacity for memory-less channels with coherent detection. Further, they can be encoded and decoded in linear-time. This paper considers the design of a non-coherent Orthogonal Frequency-Division Multiplexing (OFDM) system for block frequency-selective fading channels with non-systematic IRA codes where the receiver performs iterative channel estimation and decoding. Non-systematic IRA codes are optimized for the given system and it is shown to perform within a few tenths of a dB from the coherent receiver with the same channel parameters. The proposed scheme is shown to be robust to change in the number of channel taps and Doppler.

Further White Paper Details
Publisher	Texas A&M University	File Format	PDF
Date Published	April 2007	Downloads	1
Format	White Papers
Topics	Wireless LAN, Mobile - Wireless Communications

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