Iterative Differential Unitary Space-Frequency Decoding for Multiband-OFDM UWB Communication Systems

Recently, noncoherent UWB radios have generated increasing interest among researchers due to the advantage of not requiring channel state information (CSI) at both transmitter and receiver. However, the trade-off is a penalty of approximately 3 dB in the required SNR compare to the coherent case. In order to overcome the gap, in this paper, we propose a differential encoding and decoding scheme for multiband UWB systems. The proposed scheme employs the parallel concatenation of two differential unitary 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.