Disjoint LDPC Coding for Gaussian Broadcast Channels

Details Disjoint LDPC Coding for Gaussian Broadcast Channels Disjoint LDPC Coding for Gaussian Broadcast Channels

2009-06-15

arxiv.org/abs/0906.2819v1

Computer Science

Information Theory

5 pages, 1 figure, 3 tables, To appear in Proc. IEEE International Symposium on Information Theory (ISIT 2009), Seoul, Korea,

Scientific paper

Low-density parity-check (LDPC) codes have been used for communication over a two-user Gaussian broadcast channel. It has been shown in the literature that the optimal decoding of such system requires joint decoding of both user messages at each user. Also, a joint code design procedure should be performed. We propose a method which uses a novel labeling strategy and is based on the idea behind the bit-interleaved coded modulation. This method does not require joint decoding and/or joint code optimization. Thus, it reduces the overall complexity of near-capacity coding in broadcast channels. For different rate pairs on the boundary of the capacity region, pairs of LDPC codes are designed to demonstrate the success of this technique.

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