Computationally efficient channel estimation and inter-carrier interference suppression for OFDM communication systems-中国期刊网

摘要 Thisarticleputsforwardanovelchannelestimationandinter-carrierinterference(ICI)suppressionmethodfortime-varyingorthogonalfrequencydivisionmultiplexing(OFDM)systems.Theproposedadaptivefiniteimpulseresponse(FIR)filterutilizesthetimedomaincorrelationofthesubcarriers.Basedontheoneorderauto-regressive(AR)model,amodifiedKalmanfilterisexploitedtotrackthechannelvariance.BysolvingtheYule-Walkerequation,thecoefficientoftheARprocesscanbeobtainedfromzeroorderBesselfunction.However,whenthechannelisassumednotperfectlyknown,theabovecriterionwillleadtoanimpracticalapplication.Todealwithit,thecoefficientoftheARprocessistakenasaconstant.Subsequentlyanewstatespacemodelisdeducedandfound.Simulationresultsshowthattheproposedmethodcanworkeffectivelyatthespeedof144km/hwithaphasenoiseof-85dBc/Hzat100kHzoffset.Theproposedmethodyieldsanimprovementbiterrorrate(BER)comparedwiththreeoftheexistingalgorithmswithmuchlowercomplexity.

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Computationally efficient channel estimation and inter-carrier interference suppression for OFDM communication systems

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Computationally efficient channel estimation and inter-carrier interference suppression for OFDM communication systems

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