Abstract
A new baseband signal processing method for estimating frequency offset in coherent demodulation of PSK and QAM signals, transmitted over frequency selective fading channels is introduced. This method estimates frequency offset from the intersymbol interference (ISI) caused by the fading channel as well as from the information symbol. Its structure resembles that of RAKE receivers for CDMA receivers, and thus it is called the RAKE frequency estimator. Computer simulation results demonstrate that the RAKE frequency estimator can perform much better than existing methods in frequency selective fading channels.
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