基于超指数初始化的判决导引盲均衡算法研究  

On Decision Directed Blind Equalization Algorithm Based on Super-exponential Initialization

作　　者：张银兵[1] 赵俊渭[1] 郭业才[2] 孙勇[1] 

机构地区：[1]西北工业大学航海学院,西安710072 [2]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《系统仿真学报》2009年第1期76-79,共4页Journal of System Simulation

基　　金：国家自然科学基金资助项目(60372086);全国博士学位论文作者专项基金资助(200753)

摘　　要：在高速水声通信和多点通信系统中,盲均衡算法由于不需要发送训练序列而节省了信道带宽,得到了广泛的关注。Bussgang类盲均衡算法中,判决导引(DD)算法虽然剩余码间干扰小,但收敛能力较弱,往往不具备使闭合眼图睁开的能力,因此常采用收敛能力较强的盲均衡算法作冷启动,在眼图睁开以后再切换到判决导引模式。利用超指数(SE)算法收敛速度快和收敛平稳的特点,提出了一种双模式盲均衡算法。该算法在收敛阶段采用超指数算法,之后通过判决准则切换到DD算法,有效地加快了算法的收敛速度,保证了算法的收敛稳定性。通过计算机仿真,表明了该方法的有效性。Blind equalization has drawn broad attention in high data rate underwater communication systems and multipoint communication systems, because it can save bandwidth without sending training sequence. Although decision directed （DD） algorithm has the advantage of smaller inter-symbol interference among the Bussgang class blind equalization algorithms, it has weaker convergence ability to make the closed eye-diagram open. Thus, blind equalization algorithms with strong convergence ability are often used at first and switch to the DD algorithm after the closed eye-diagram is open. According to the characteristics on fast convergence speed and stability of super-exponential （SE） method, a kind of dual-mode blind equalization method was proposed. At the beginning of the convergence process, the SE algorithm is used. Then it switches to DD algorithm depending on a proposed criterion. This method has accelerated the convergence speed of the blind algorithm and ensured its stability. The performance of the proposed algorithm is validated by computer simulations.

关 键 词：水声通信 盲均衡 超指数 判决导引 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]