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WCDMA Interference Cancellation Wireless Repeater Using Variable Stepsize Complex Sign-Sign LMS Algorithm  

Hong, Seung-Mo (RFWINDOWS)
Kim, Chong-Hoon (School of Electronic Engineering, Soongsil University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.47, no.9, 2010 , pp. 37-43 More about this Journal
Abstract
An Interference Cancellation Wireless Repeater transmitts directly amplified the RF signal input to extend the coverage of the base station. Such a repeater inevitably suffers from the feedback interferences due to the environment and the adaptive Interference Cancelling System(ICS) is necessary. In this paper, the Variable Stepsize Complex Sign -Sign(VSCSS) LMS algorithm for ICS is presented. The algorithm can be implemented without multiplication/division arithmetic operation so that the required logic resources can be dramatically reduced in FPGA implementation. The performance of the proposed algorithm was analyzed in comparison with CSS-LMS algorithm and the learning curves obtained from simulation showed an excellent agreement with the theorical prediction. The simulation result with ICS in fading feedback channel environment showed the performance of the proposed algorithm is competible with NLMS algorithm.
Keywords
Inference Cancellation; Adaptive Filter; Multipath Fading Channel;
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