【作者】 聂远飞；

【导师】 葛建华；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2005， 硕士

【摘要】 本文重点研究了几类典型基于Turbo准则的串行级联系统的迭代译码算法。文章首先阐述了SCCC的编译码器结构,推导了基于格图的MAP译码算法,并由此引入一般性的SISO实现构架;其次,推导了BICM和BICM-ID的欧氏距离准则,以此为依据,对它们相关组成部分的影响作了分析;再次,本文研究了Turbo均衡的实现与性能,通过对MAPEQU算法和SCCC译码算法的联合比较给出了Turbo均衡的一般结构,推导了软ISI抵消滤波器、基于MMSE的线性滤波及判决滤波反馈这三种Turbo均衡算法;最后,针对实现级联码译码量化实现,提出了一种基于SDR的双目标规划设计算法。本文各章节均给出的相关的仿真结果,对文章的有关结论予以验证。更多还原

【Abstract】 This dissertation mainly studies the iterative decoding algorithms in typical serial concatenated systems based on Turbo principle. Firstly, the SCCC decoding scheme is described, followed by the derivation of the MAP algorithm based on the trellis gragh. According to it, the general structure of the SISO is presented. Secondly, the Euclidean distances of the BICM and BICM-ID are formulated, which are used to analysis the performance under different channels and constellation modulations. Thirdly, the realization and performace of Turbo equalizer are studied. The general frame of Turbo equalization is obtained through comparing the MAPEQU with the SCCC decoding algorithm. Three algorithms including Soft ISI Cancellation, linear equalization and decision feedback equalization based on MMSE are presented. Finally, a scheme using the double objects programming based on SDR is purposed, and applied to the given concatenated code. Every chapter the simulation results are provided to prove the corresponding conclusions.更多还原