LMMSE频域均衡系统中的最优LDPC码设计  

Optimal LDPC Code Design for Frequency Domain Equalization System Based on LMMSE

作　　者：李海涛[1] 林孝康[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《电视技术》2008年第11期11-13,19,共4页Video Engineering

基　　金：清华-高通CDMA无线通信研究项目(20073000463)

摘　　要：首先介绍了基于LMMSE准则的频域均衡算法的基本原理及其信噪比演进技术,进而采用高斯近似的方法引出了LDPC码的最优设计问题,并通过将优化问题分解为线性优化对其进行迭代求解。针对优化所得的LDPC码进行仿真,结果表明其性能优于已有文献中给出的LDPC码性能,并且更加接近系统容量。A brief introduction to the frequency-domain equalization algorithm based on Linear Minimum Mean Square Error （LMMSE） is presented, together with its SNR evolution technique. With Gaussian approximation, an issue of designing optimal LD- PC is introduced, and the solution is simplified by solving the linear optimization in an iterative way. Simulations are carried out for the optimized LDPC. The result shows that the performance is superior to that given in literature, and is closer to the ultimate system capacity.

关 键 词：频域均衡 线性最小均方误差准则 低密度偶校验码 优化 

分 类 号：TN911[电子电信—通信与信息系统] TN949.1[电子电信—信息与通信工程]