A frequency domain equalization algorithm for fast time-varying fading channels

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.Index Terms: Cancellation, direct sequence code division multiple access (DS-CDMA), fast time-varying fading channels, frequency domain equalization (FDE).

Handover reduction using optical matrix switch for indoor LTE cell deployment

“…This kind of artificial fading occurs in both uplink and downlink radio channel. In our assumption, fading can be compensated by the channel equalization technique equipped in LTE system such as frequency domain equalization (FDE) [13]. The performance evaluation assumes that fading has negligible impact on the process of handover and also the number of handover.…”