引入迭代阈值判决导引判决反馈盲均衡算法  

Introduced-iterative threshold based decision directed decision feedback blind equalization algorithm

作　　者：郭业才[1] 周巧喜[2] 

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《舰船科学技术》2009年第3期139-142,共4页Ship Science and Technology

基　　金：全国博士学位论文作者专项基金资助项目(200753);江苏省高等学校自然科学基金资助项目(08KJB510010;07KJB510068)

摘　　要：基于判决圆的常数模算法(CMA)和判决导引算法(DD)相结合的判决反馈盲均衡算法(CMA+DD),在均衡的起始阶段,由于眼图未睁开,DD算法无法收敛,导致收敛速度慢。为了加快收敛速度,在迭代过程中引入迭代阈值limit,以修改CMA+DD算法的判决条件,从而得到改进的CMA+DD算法(MCMA+DD)。该算法在均衡的起始阶段先采用CMA迭代limit次,然后再根据判决圆进行切换。水声信道仿真结果表明,MCMA+DD算法收敛速度快;迭代阈值不同,影响收敛速度;仍具有冷启动和重新启动能力。Decision feedback equalization algorithm, which combines the decision directed algorithm and constant modulus algorithm （ CMA ＋ DD ） based on decision circle ring, has the defect of slow convergence rate,as eye diagram is close and DD algorithm can not converge at the beginning of iteration. In order to improve convergence rate, an iteration threshold （ hereinafter as limit） is introduced to iteration process to modify judging conditions of CMA ＋ DD and a modified algorithm（ MCMA ＋ DD）is thus obtained. At the beginning of iteration,iterations adopted CMA are equal to iteration threshold,then switch is carried out according to the decision circle ring. Computer simulation with underwater acoustics channel shows that the MCMA ＋ DD has the faster convergence rate,cold start and restart ability and different convergence rate when threshold values are different.

关 键 词：判决反馈盲均衡 常数模 判决导引 迭代阈值 

分 类 号：TN911[电子电信—通信与信息系统]