期刊
IEEE COMMUNICATIONS LETTERS
卷 4, 期 2, 页码 62-64出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/4234.824757
关键词
error correcting codes; low density parity check codes; turbo codes
This letter is concerned with the implementation issue of the sum-product algorithm (SPA) for decoding the low density parity check codes, It is shown that the direct implementation of the original form of SPA is sensitive to the quantization effect. We propose a parity likelihood ratio technique to overcome the problem. It is shown that for comparable performance the new method can be implemented with much less quantization bits, which can lead to considerably lower decoding cost.
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