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LTE系统具有频谱效率高、可靠性强的优点。为了现实这些优点,系统采用了Turbo码和高阶调制相结合的方法,接收端的译码输入为比特级的软信息,所以解调需要采用软解调的方法。目前比较成熟的软解调算法有log_MAP和max_log_MAP。本文在max_log_MAP算法基础之上对算法进行了改进,使计算复杂度更低,同时提出了一种算法复杂度更低的软解调算法,该算法和Turbo译码的组合可在减少硬件复杂性的同时保持最佳性能。
LTE system has the advantages of high spectral efficiency and high reliability. In order to actualize these advantages, the system uses a combination of Turbo code and high-order modulation, and the decoding input of the receiving end is bit-level soft information, so the demodulation needs a soft demodulation method. Currently more mature soft demodulation algorithm log_MAP and max_log_MAP. This paper improves the algorithm based on the max_log_MAP algorithm to make the computational complexity lower and proposes a soft demodulation algorithm with lower complexity. The combination of this algorithm and Turbo decoding can reduce the hardware complexity While maintaining the best performance.