Bayesian Message-Passing Based OFDM Receiver for Doubly-Spread Multipath Channels

In this paper, we propose a novel receiver design for orthogonal frequency division multiplexing (OFDM) transmission over doubly (time- and frequency-) spread channels, where the receiver employs a turbo message passing (TMP) algorithm for joint channel estimation and data detection. We show that the proposed TMP-based receiver is able to make more efficient use of the prior information about the channel and the data for inter-carrier interference (ICI) cancellation than the existing iterative receivers. The proposed TMP algorithm can be further combined with a soft-input soft-output (SISO) decoder for joint channel estimation, data detection and decoding. Numerical results are presented to demonstrate the performance superiority of our proposed TMP-based OFDM receiver.