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Adaptive Searching Channel Estimate Algorithm for IMT-Advanced Repeater  

Lee, Suk-Hui (Dept. of Electronics Eng. Dankook University)
Lee, Sang-Soo (Dept. of Electronics Eng. Dankook University)
Lee, Kwang-Ho (Dept. of Electronics Eng. Dankook University)
Bang, Sung-Il (Dept. of Electronics Eng. Dankook University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.46, no.11, 2009 , pp. 32-39 More about this Journal
Abstract
In this thesis, design effective elimination interference algorithm of ICS repeat system for repeater that improve frequency efficiency. Gennerally, LMS Algorithm apply to ICS repeat system. Error convergence speed and accuracy of LMS Algorithm are influenced by reference signal. For improve LMS Algorithm, suggest Adaptive searching channel estimate algorithm. For using channel characteristic, adaptive searching channel estimate algorithm make reference signal similar interference signal by convolution operation and complement LMS algorithm demerit. For make channel similar pratical channel, apply Jake's Rayleigh multi-path model. LMS algorithm and suggested adaptive searching channel estimate algorithm that have 16 taps apply to ICS repeat system under Rayleigh multi-path channel, so simulate with MATLAB. According to simulate, ICS repeat system with LMS algorithm show -40 dB mean square error convergent after 110 datas iteration and ICS repeat system with adaptive searching channel estimate algorithm show -80 dB mean square en-or convergent after 120 datas iteration. Analyze simulation result, suggested adaptive searching channel estimate algorithm show 40 dB accuracy than LMS algorithm.
Keywords
Interference cancellation; Repeater; Convolution; LMS algorithm;
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