斩波稳零下自适应干扰对消系统的性能分析  

Analysis of chopping stabilizing zero for adaptive interference cancellation system

作　　者：蒋云昊[1] 马伟明[2] 赵治华[2] 

机构地区：[1]华中科技大学电气与电子工程学院,湖北武汉430074 [2]海军工程大学舰船综合电力技术国防科技重点实验室,湖北武汉430033

出　　处：《通信学报》2010年第3期65-74,共10页Journal on Communications

基　　金：国家自然科学基金资助项目(50721063)~~

摘　　要：分析了实际模拟自适应干扰对消系统中权值控制支路存在零漂时权值和误差的时域特性。零漂的存在易造成稳态权值偏离最优权值,导致干扰对消比显著下降,但不影响系统的平均收敛速度。斩波稳零法是克服零漂的主要方法,对采用基波斩波下系统的性能进行了理论推导,并通过仿真进行了分析。基波斩波导致系统成为时变系统,克服了零漂的同时,在权值中增加了新的频率分量,引入了新的干扰并导致干扰对消比有所降低。The time-domain characteristics of weights and error in analog adaptive interference cancellation system were analyzed with null shifts in weight branches. Analysis shows that the steady weights drift the optimal weights and the in- terference cancellation ratio decreases due to null shifts, but the average convergence speed is not influenced. Chopping stabilizing zero is a main method for solving null shift. The theoretical derivations were gained with the fundamental wave chopping and simulation results were got. Fundamental wave chopping makes the system a time-variation system. Weights have new frequency components and the new interferences come out. The interference cancellation ratio （ICR） decreases simultaneity.

关 键 词：通信理论 自适应干扰对消 斩波 零漂 权值 干扰对消比 

分 类 号：TN911.4[电子电信—通信与信息系统]