基于改进滑动窗的Turbo译码算法研究

Research on Turbo Decoding Algorithm based on Improved Sliding-window

首先介绍LTE-A系统中Turbo编译码器的结构和译码原理,分析RADIX-4 Turbo译码算法。然后介绍Turbo译码的两种滑动窗算法,并提出一种性能损失较小的改进滑动窗算法。在此基础上,结合并行译码、RADIX-4 Turbo译码算法,提出一种适用于LTE-A系统的Turbo译码算法,并与目前主要的几种Turbo译码算法进行运算复杂度、存储开销方面的比较和性能仿真。比较和仿真结果表明所提出的Turbo译码算法在性能损失较小的同时具有低时延低存储的特性,能够满足LTE-A系统中高速Turbo译码的要求。

This paper describes first the structure of Turbo coder/decoder and the decoding principle of Turbo code in LTE-A system, analyzes RADIX-4 based Turbo decoding algorithm. Then is gives two kinds of sliding window algorithms for Turbo decoding, including an improved sliding window algorithm with fairly little performance loss. And finally based on this improved sliding window algorithm and combined with parallel and RADIX-4 Turbo decoding algorithm, this paper proposes a Turbo decoding algorithm applicable to LTE-A system. Comparison of this the new decoding algorithm with other Turbo decoding algorithms on computational complexity and memory cost is done, and simulation indicates that the proposed turbo decoding algorithm has less performance loss while is of low delay and low memory, and thus could meet the requirements of high-speed Turbo decoder in LTE-A system.