FMT系统中的迭代信道估计和Turbo均衡  

Iterative channel estimation and Turbo equalization for FMT systems

作　　者：钟华[1,2] 郑林华[1] 

机构地区：[1]国防科技大学电子科学与工程学院 [2]95746部队

出　　处：《通信学报》2010年第7期81-87,共7页Journal on Communications

摘　　要：在滤波多音调制(FMT)系统中,为了消除由于原型滤波器非理想重构特性和多径信道所导致的符号间干扰,提出了一种联合迭代信道估计和Turbo均衡的FMT系统接收方法,通过对FMT系统中每个子信道的等效冲激响应进行迭代估计,然后采用基于线性滤波器结构的Turbo均衡器来消除符号间干扰。仿真结果表明,不论采用QPSK调制方式还是16QAM调制方式,经过2次以上的迭代后,相比较于传统的判决反馈均衡算法,新算法的误码率性能得到了大大改善。To eliminate the intersymbol interference（ISI） caused by the ＂imperfect reconstruction＂ prototype filers and the wireless channel in filtered multitone modulation（FMT） systems,an iterative channel estimation and equalization algorithm was proposed.The equivalent response of each subchannel could be iteratively estimated,and then the ISI could be eliminated by the Turbo sub-channel iterative equalizer adopting linear filers.Simulation results indicate that the proposed algorithms can yield remarkable improvements in BER performance comparing with the DFE equalizer for both QPSK and 16QAM modulation after no less than two iterations.

关 键 词：迭代信道估计 TURBO均衡 滤波多音调制 符号间干扰 

分 类 号：TN911.5[电子电信—通信与信息系统]