Adaptive Step Size Control of LMS-based Interference Cancellation for ICS Repeater in Wibro Environment  

作　　者：Jeong-gon KIM Won-geon BAE Won-seok CHOI 

机构地区：[1]Dept.of Electronic Engineering,Korea Polytechnic University,Kyunggi-Do 429-793,Korea

出　　处：《Journal of Measurement Science and Instrumentation》2010年第1期98-102,共5页测试科学与仪器（英文版）

基　　金：supported bythe IT R&D Programof MKE/ⅡTA:Development of Service Platform for Next Generation Mobile Communications

摘　　要：The use of repeater for the support of high rate data trans- mission and the extension of cell coverage is imperative for the Wibro system, which based on the IEEE 802.16e standardization. Generally, if the separation between transmitting and receiving antennas is not sufficient, the oscillation of repeater and the interference due to the feedback signals from original transmitted signal may be oectLrr. Hence, the Interference Cancellation System （ICS） should be implemented as the important part of the repeater system for the mobile cellular systems in order to eliminate unwanted signals from the corrupted signals in the receiver. In this paper, we propose an adaptive technique for the Least Mean Square（LMS）-based interference cancellation methods by changing the step size according to the variation of channel envirorauent in onter to improve the performance degradation which occta-rs by using the fixed step size approach. Simulation results show that the proposed scheme attains a little lower Ber Error Rate（BER） performance and much faster convergence speed compared to the conventional LMS-based interference cancellation techniques. The proposed scheme can be applied to other Orthogonal Frequency Division Multiple（OFDM）-based cellular systenas and also be expected to achieve a similar performance improvement to IMT-advanced system, which is called as the next generation mobile communication standards.

关 键 词：WIBRO mobile communication repeater adaptive inter-ference cancellation 

分 类 号：TN929.53[电子电信—通信与信息系统]