Turbo码作为LTE系统的编码方案之一,其译码方法的选择对Turbo码的性能与实现具有重要影响。为满足LTE系统对译码实现方案的低复杂性和低时延要求,文章在SF-MAX-Log-MAP算法和并行译码算法的基础上,对该两种算法进行了结合,并在LTE系统中进行了误码率性能仿真。通过仿真表明:SF-Max-Log-MAP并行译码算法,不仅使Turbo码的译码性能接近于传统的Log-MAP并行译码算法且减小了译码过程中的计算量,进一步降低了译码时延,是一种有效译码算法。

Turbo code,as a kind of LTE encoding scheme,its decoding method has an important influence on its performance and realization.In order to satisfy the low complexity and low delay requirement of LTE decoding,it carries on the union of SF-MAX-Log-MAP algorithm and parallel decoding.Also it has a simulation of the Turbo error rate in LTE system.From simulation result,SF-MAX-Log-MAP parallel decoding algorithm not only can approach the decoding performance of SW-Log-MAP parallel decoding algorithm,but also reduce the computational quantity,reducing the decoding delay more.