Simplified soft output demapper for non-binary LDPC codes
Résumé
Combining non-binary LDPC codes and high order constellation, namely Bit-Interleaved Coded Modula-tion (BICM), is a simple but effective way to improve the bandwidth efficiency. Since the non-binary LDPCcodes require soft decisions as the input information, the constellation has to provide soft information(log-likelihood ratio) to it. In this paper, a simplified algorithm to calculate LLR for binary code is appliedfor non-binary code, which will remarkably reduce the computational complexity, and has nearly noperformance loss
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