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Fast log-likelihood ratio (LLR) computation for decoding high-order and high-dimensional modulation schemes
Fast log-likelihood ratio (LLR) computation for decoding high-order and high-dimensional modulation schemes
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机译：快速对数似然比（LLR）计算，用于解码高阶和高维调制方案
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摘要
A method receives the symbol transmitted over a channel, selects, from a constellation of codewords, a first codeword neighboring the received symbol and a set of second codewords neighboring the first codeword, and determines a relative likelihood of each second codeword being the transmitted symbol with respect to a likelihood of the first codeword being the transmitted symbol. Next, the method determines an approximation of a log-likelihood ratio (LLR) of each data bit in the received symbol as a log of a ratio of a sum of the relative likelihoods of at least some of the second codewords having the same value of the data bit to a sum of the relative likelihoods of at least some of the second codewords having different value of the data bit and decodes the received symbol using the LLR of each data bit.
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