Receiver techniques based on the time-frequency channel model

We develop new simplified reception techniques that maximally exploit channel diversity via joint multipath-Doppler processing. Our approaches are based on joint multipath-Doppler diversity by spreading the symbol waveform beyond the intersymbol duration to make the channel time-selective. We simplify the decorrelator receiver. The two schemes based on joint multipath-Doppler diversity are discussed, and multiuser detection techniques such as parallel interference cancellation and decorrelators in fast fading channels. The result shows the two schemes in multiuser and Fast Fading environments can combat effectively against fading, intersymbol interference and multiple-access interference.