Achievable Rates of Noncoherent Fading Channels

Virtually all mobile communication takes place over time-varying fading channels, whose realization is a priori unknown to the receiver. Nevertheless, neither the capacity nor the optimal input distribution for this class of channels are known. However, knowledge on the achievable rate and the optimal input distributions allows for conclusions on the possible performance gain with advanced receivers, e.g., using code-aided channel estimation, in comparison to the classical coherent detection using a solely pilot symbol based channel estimation.

Therefore, we study open questions concerning the achievable rate in single user as well as multiuser scenarios taking into account the lack of channel knowledge at the transmitter and the receiver. The results will help to understand performance limits and possible gains of advanced communication schemes in realistic mobile communication environments.

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Meik Dörpinghaus