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A Frequency Domain Equalization Algorithm for Fast Time-Varying Fading Channels  

Tran, Le-Nam (School of Electronics and Information, Kyung Hee University)
Hong, Een-Kee (School of Electronics and Information, Kyung Hee University)
Liu, Huaping (School of Electronic Engineering and Computer Science, Oregon State University)
Publication Information
Journal of Communications and Networks / v.11, no.5, 2009 , pp. 473-479 More about this Journal
Abstract
Conventional frequency domain equalization (FDE) schemes were originally devised for quasi-static channels. Thus, such equalization schemes could suffer from significant performance degradation in fast-fading channels. This paper proposes a frequency domain equalization algorithm to mitigate the effect of fast time-varying fading. First, a mathematical expression is derived to quantify the total interference resulting from the time variation of the channel. Then, the proposed approach attempts to eliminate the effect of time-variations of the channel. This cancellation allows efficient use of the classical FDE structures in fast time-varying fading environments, although they are built upon the quasi-static channel model. Simulation results of bit-error-rate performance are provided to demonstrate the effectiveness of the proposed algorithm.
Keywords
Cancellation; direct sequence code division multiple access (DS-CDMA); fast time-varying fading channels; frequency domain equalization (FDE);
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