基于硬判决的BICM-ID系统的迭代载波相位同步算法  

An iterative carrier phase synchronization algorithm for hard-decision based BICM-ID systems

作　　者：吕强[1] 赵春晖[1] 毕文斌[2] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,哈尔滨150001 [2]中国船舶重工集团公司,北京100085

出　　处：《高技术通讯》2008年第2期132-136,共5页Chinese High Technology Letters

基　　金：中船重工集团重点基金(10y-0401)资助项目

摘　　要：在基于迭代译码的比特交织编码调制(BICM-ID)系统中,提出了一种利用译码产生的硬判决信息作引导的迭代载波相位同步的算法。该算法等效于期望最大化(EM)算法,收敛于最大似然(ML)估计,利用 Viterbi 译码过程中产生的数据比特硬判决信息,通过迭代地在同步和解码之间交换信息来完成联合解码和载波相位同步,实现了联合解码同步。仿真结果验证了该算法的有效性。在相偏θ∈[-20°,20°]时,其误码率性能最佳;在迭代次数达到5次时,误码率性能基本接近理想同步性能,较传统的相位同步算法具有更优的性能。随着信噪比的增大,能更快地逼近理想同步性能。An iterative carrier phase synchronization algorithm for the systems of hard-decision based bit-interleaved coded modulation with iterative decoding（BICM-ID） is proposed in this paper, which uses the hard-decision information provid- ed by the decoder. It is equal to Expectation-Maximization（EM） algorithm and converges to Maximum Likelihood （ML） estimation and makes use of the hard-decision information provided by the Viterbi decoder to get good estimate of carrier phase by iteratively exchanging information between the synchronizer and the decoder. Simulation results show that the al- gorithm is effective. On condition of θ∈ [-20°,20°], it has the best bit error rate （BER） performance and its BER performance can approach optimality in ideal synchronization when the iterative number reaches 5. Compared with the classical methods, it has better performance. With the increasing of Signal-to-noise rate（SNR）, it approaches the performance of ideal synchronization faster.

关 键 词：基于迭代译码的比特交织编码调制(BICM-ID) 同步 载波相位 硬判决 

分 类 号：TN761[电子电信—电路与系统]