WCDMA无线直放站中自适应干扰抵消单元的设计方案

Design of Interference Cancellation Module in WCDMA Digital and Wireless Repeater

WCDMA数字无线直放站由于架设方便,外形美观等优点受到市场的追捧。它采用自适应干扰抵消技术,可以消除由于自身收发天线隔离度小而产生的自激问题。文章针对WCDMA系统中的自适应干扰抵消技术展开了研究。重点对时域的三种干扰抵消算法:LMS、NLMS和RLS算法,进行了研究和性能分析,并在原有的NLMS算法的基础上,为降低复杂度和节省资源,提出一种新的H-NLMS算法。最后在MATLAB仿真环境中建立WCDMA干扰抵消直放站系统链路级仿真模型,验证改进的算法和干扰抵消单元的性能。

WCDMA digital and wireless repeater is favored by the market because of the advantages of setting up conveniently and beautiful appearance. It uses adaptive interference cancellation (AIC) technology to solve the self-excitation which is caused by the small isolation between its transmit and receive antennas. In this paper, adaptive interference cancellation technique in WCDMA Repeater is studied. This article focuses on three time-domain interference cancellation algorithm: LMS, NLMS and RLS. This paper presents a new H-NLMS algorithm based on NLMS algorithm in order to reduce the complexity and save resources. Finally, a simulation model of WCDMA repeater which uses interference cancellation technology is built in the MATLAB simulation environment, and the model can verify the performance of the improved algorithm and he interference cancellation unit in this paper.