Equalization Algorithm for OFDM SystemusingZero-PaddingTechnique
M. Zoubir, Perth Wa · 2007
We introduce anadaptive channel equalization al- gorithm fororthogonal frequency division multiplexing (OFDM) employing highbandwidth-efficiency quadratic amplitude mod- ulation (QAM)signaling. Ourapproach usestheguardbandto yield aunique equalizer estimate through aleast square fitting (LSF)criterion. Torefine theequalizer estimation, acombination ofaLSFandconstant modulus algorithm (CMA)basedequalizer isproposed. Inordertominimize theerroroftheoverall structure, astochastic gradient algorithm isimplemented .Itis shownthattheproposed schemeissuperior andmorerobust inlowsignal tonoiseratio (SNR)environments. Simulation results demonstrate thatusing thecombination schemeimproves adaptive channel equalization byincreasing convergence rateand decreasing thesteady-state meansquare error. IndexTerms:OFDM,CMA,MCMA, Adaptive blind equal- ization algorithm, GI-restoral property.