半盲OFDM频域联合均衡算法  

Semi-blind OFDM frequency domain joint equalization algorithm

作　　者：李琦[1] 李宏伟[1] 蔡斌[1] 杨洁[2] 耿耿[3] 

机构地区：[1]空军工程大学信息与导航学院,西安710077 [2]西安应用光学研究所,西安710065 [3]空军装备研究院通信所,北京100085

出　　处：《计算机应用研究》2013年第2期574-576,共3页Application Research of Computers

基　　金：航空基金资助项目(20112096016)

摘　　要：传统的频域恒模盲均衡算法通常与星座图硬判决相结合,而硬判决方法会引起判决符号错误,导致收敛慢、稳态误差大。为解决这一问题,将软判决引导与恒模算法相结合,提出了一种半盲联合频域均衡算法。仿真表明,与采用单一恒模算法相比,该算法的误码率性能明显提高,在信噪比为25 dB时就可达到10-5,有效地实现了对时变信道的跟踪和均衡。Traditional frequency domain constant modulus algorithm used to be combined with hard decision-directed method. But the hard decision would induce decision fault which led to slower convergence and bigger stable MSE. In order to solve this problerm, this paper cooperated with soft decision-directed （SDD） and proposed a joint semi-blind equalization scheme of OFDM frequency domain based on CMA. According to simulation results, this algorithm has better error bit ration performance than sin- zle CMA scheme, even to reach 10 -5 in environment of 25 dB SNR. It could track and equalize fast time-varying channel.

关 键 词：正交频分复用(OFDM) 恒模算法 软判决引导 半盲均衡 

分 类 号：TN911.3[电子电信—通信与信息系统]