TD-LTE系统中Turbo译码算法及DSP实现

摘要

Turbo code is highly accepted for its excellent rectifying performance in TD-LTE (Time Division-Long Term Evolution) system, concerning to the high decoding complexity and the long time delaying of traditional Log-Map algorithm, a simplified Log-Map algorithm was proposed, this paper compared a variety of Turbo decode algorithms through simulation in the atmosphere of AWGN, and realized the proposed simplified algorithm in the TMS320C64x DSP. The running results of the decoding program in CCS3.3 verify that the scheme is feasible and effective.%在TD- LTE系统中,Turbo码以其优异的纠错性能而备受关注.针对传统Log - Map算法译码复杂度大且时延长的缺点,提出一种简化的Log-Map算法.在高斯白噪声信道(AWGN)环境下,对各种Turbo译码算法性能进行了仿真比较,并对提出的简化译码算法在TMS320C64xDSP中进行实现.译码程序在CCS3.3的运行结果表明了该方案的实时性和有效性.