深空通信中Turbo编译码设计与性能仿真  

Design and Simulation of Turbo Code for Deep Space Communication

作　　者：张桂华[1] 姬红兵[1] 胡家佺[1] 李会莲[1] 

机构地区：[1]西安电子科技大学

出　　处：《系统仿真学报》2008年第17期4676-4680,共5页Journal of System Simulation

基　　金：国防预研基金项目(XXXXA24080106DZ0144)

摘　　要：深空通信信号传输距离遥远,能量衰减大,接收信号微弱,必须采用高增益的信道编码技术来提高接收能力。针对深空微弱信号处理的实际要求,介绍了Turbo码的编译码原理,详细分析了各编码参量和译码算法对性能的影响,将先进的二次置换多项式(QPP)交织器和线性拟合Log-Map译码算法结合,提出了一种新的深空编码实现方案,降低了交织器对存储的要求和译码算法的复杂性,减少了计算量,节省了存储空间。通过参量优化设计,提高了纠错性能。仿真实验结果表明:设计能够满足微弱信号低信噪比要求,而且易于物理实现。It＇s necessary to adopt high-gain channel coding technique to enhance the received sharply-attenuated weak signal from deep space, According to the practical requirement, a brief introduction to the principles of the Turbo codes was given, followed by an analysis and comparison of the effect of deference parameters and algorithms on the decoding performance in details. A practical design combining the advanced QPP interleaver and linear Log-MAP algorithm was finally presented, which reduces the requirement of the interleavers to storage and the mathematic complexity of its decoding algorithm, 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.

关 键 词：深空通信 TURBO码 交织器 LOG-MAP译码算法 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]