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METHOD OF APPROXIMATING LOG-LIKELIHOOD RATIOS IN QAM DIGITAL TRANSMISSIONS AND RELATIVE QAM SOFT-OUTPUT DE-MAPPER
METHOD OF APPROXIMATING LOG-LIKELIHOOD RATIOS IN QAM DIGITAL TRANSMISSIONS AND RELATIVE QAM SOFT-OUTPUT DE-MAPPER
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机译：QAM数字传输中近似对数似然比的方法和相对的QAM软输出解映射器
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摘要
Log-likelihood ratios are approximated for encoded bits modulated with a 2m-ary QAM constellation. Each symbol of the constellation is identified by a respective string of m bits. The log-likelihood ratio of each bit of the m bits is approximated with a product λ of a respective factor by a respective variable D that depends on a received signal and on communication channel characteristics. The approximating includes determining a value of at least one of the variables D using a parametric nonlinear function of an equalized replica ≈ of a respective received signal.
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机译：对数似然比近似于以2 m ary QAM星座调制的编码比特。星座图的每个符号由m位的相应字符串标识。 m个比特中的每个比特的对数似然比与相应因子乘以相应变量D的乘积λ来近似，该变量D取决于接收信号和通信信道特性。近似包括使用各个接收信号的均衡副本≈的参数非线性函数来确定变量D中至少一个的值。
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