一种实用的Turbo码编译码设计

A Practical Coding and Decoding Scheme For Turbo Codes

Turbo码对解决远距离微弱信号处理问题提供了良好的途径，然而其交织器对存储的要求和译码算法的复杂性，提高了其工程实现的难度。本文提出一种实用的方案，采用二次置换多项式（QPP）交织器和线性拟合Log—Map译码算法，减少了计算量，节省了存储空间。同时，通过参量优化设计，提高了纠错性能。仿真实验结果表明，该方案能够满足低信噪比条件下的误码率要求，易于工程实现。

To adopt the Turbo code is a good solution to the distant weak signal processing. The requirement of its interleavers to storage and the mathematic complexity of its decoding algorithm, however, make it difficult to implement. A practical scheme using quadratic permutation polynomial （QPP） interleaver and linear Log-Map algorithm is presented, decreasing the computation complexity, saving the storage and improving the decoding performance with parameter optimization. Simulation results show that the scheme can satisfy the BER requirement as well as be easily implemented.