QPP交织器在深空测控的应用研究

Application of QPP-based Interleavers to Deep-space Exploration

讨论有限域上置换多项式(PP)基本原理,将其中简单的二次置换多项式(QPP)应用在Turbo码的交织器中,给出满足置换条件且性能较优的交织器系数的搜索量度,同时给出相应二次逆置换多项式(QIPP)的计算方法。比较了QPP交织器与其他几种确定型交织器的性能。针对深空测控的实际要求,给出一种具体的Turbo码编译码方案。仿真结果表明:该方案能够达到设计要求,且易于工程实现。

The basic principle of Permutation Polynomial （PP） over finite field is firstly described and the simple Quadratic Permutation Polynomial （QPP） is applied to Turbo codes interleavers. The searching metric for interleaver coefficients satisfying the permutation is presented to improve the performance of the corresponding Turbo code and the method of finding corresponding Quadratic Inverse Permutation Polynomial （QIPP） is given.Then the performance comparison between QPP and other algebraic interleavers is also presented. Finally, a detailed turbo encoding/decoding scheme is designed according to the practical requirement of deep-space exploration. The simulation results show that such a scheme satisfies the requirement and can be easily implemented.