The statistics of mobile communications over frequencynonselective fading channels are determined largely by fading bandwidth,which is related to vehicle speed. On-line estimation of fadingbandwidth can be used to optimize coherent signal transmission, as wellas improve handoff algorithms. The level crossing rates of the receivedsignal amplitude, combined with on-line change detection techniques areused to estimate the fading bandwidth. The proposed estimator takes AGWNinto account and has low complexity and processing delay. Applied toadaptive on-line tracking of fast fading channel parameters, significantBER reduction is demonstrated, particularly in situations where vehiclespeed increases abruptly
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