Iterative Decoding of Differential coded Multiband-OFDM UWB Communication Systems

Compared with coherent detection, the price of not requiring channel state information (CSI) in a noncoherent UWB receiver is an increase of about 3 dB in the required SNR. In order to overcome the gap, a differential encoding and decoding scheme for multiband UWB systems is proposed in this paper. The proposed scheme employs the parallel concatenation of two differential diagonal space-frequency encoders at the transmitter and performs a simple soft decision iterative decoding at the receiver. Simulation results show that the proposed scheme can outperform the conventional differential and coherent detection at high SNR with few number of iterations.