一种分数间隔判决反馈盲均衡算法的研究  

A Fractionally-Spaced Decision-Feedback Blind Equalization Algorithm

作　　者：张银兵[1] 赵俊渭[1] 李金明[1] 孙勇[1] 

机构地区：[1]西北工业大学声学工程研究所,陕西西安710072

出　　处：《计算机仿真》2008年第8期331-334,共4页Computer Simulation

基　　金：国家自然科学基金资助项目(60372086)

摘　　要：在无线通信系统中,为了抑制由多径效应产生的严重码间干扰(ISI),必须进行信道均衡。收敛速度和剩余码间干扰是衡量盲均衡算法性能优劣的重要指标,根据超指数迭代算法收敛速度快的特点,提出了一种基于分数间隔超指数迭代判决反馈盲均衡算法。同时,引入了二阶数字锁相环(DPLL2)技术以纠正载波相位旋转,并对算法的性能进行了计算机仿真。仿真结果表明,相对于传统的波特间隔常模判决反馈均衡算法(BSCMA-DFE)获得了较快的收敛速度和较小的剩余码间干扰,纠正了载波相位旋转,提高了通信系统的质量,具有一定的实用价值。In wireless communication systems, channel equalization technologies must be used to restrain the severe inter- symbol interference （ISI） caused by multi -path fading. Convergence speed and residual ISI are main performance criteria for these equalization algorithms. According to the good convergence ability of the super - exponential iteration （SEI） algorithm, a decision - feedback blind equalization algorithm based on fractionally - spaced SEI algorithm is proposed. Combined with second - order digital phase - locked loop （DPLL2） technology used to correct the phase rotation of the carrier frequency, the performance of the proposed algorithm is verified by computer simulation. Compared with the traditional baud - spaced constant modulus decision - feedback equalization algorithm （ BSCMA - DFE）, the simulation result shows that the proposed algorithm has the characteristics of faster convergence and less residual ISI. It can correct the phase rotation of the carrier frequency and improve the performances of communication systems so that it is valuable in applications to some extent.

关 键 词：盲均衡 超指数 判决反馈 分数间隔 锁相环 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]