| Publisher | Texas A&M University | ||
|---|---|---|---|
| Format | 225.9KB PDF | Date added | 13 Apr 2007 |
| Topics | Wireless LAN, Mobile - Wireless Communications | ||
| Downloads | 22 | ||
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.
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