Pragmatic Approach to Soft-Decision Decoding of Linear Block Codes
The complexity of algorithms to perform soft-decision decoding on block codes has impeded their use in practical systems. The authors investigate correlation decoding along with hard-decision decoding. The proposed method uses a hard-decision decoder that decodes to a codeword. Although this codeword may be in error, it is usually close in Hamming distance to the transmitted codeword. Correlation is then performed on only a small set of `nearby' codewords. This pseudo maximum likelihood (PML) decoding method can approach the performance of true correlation decoding with a significant reduction in complexity.
Thesling, William H. and Xiong, Fuqin, "Pragmatic Approach to Soft-Decision Decoding of Linear Block Codes" (1995). Electrical Engineering & Computer Science Faculty Publications. 125.
Thesling, W.H., Xiong, F., (1995). Pragmatic approach to soft-decision decoding of linear block codes. IEE Proceedings-Communications, 142, 1, 40-47, doi: 10.1049/ip-com:19951694