Combined iterative demapping and decoding for coded M-ary BOK DS-UWB systems

The use of combined iterative demapping/decoding (CIDD) is investigated in coded M-ary biorthogonal keying based direct sequence ultra wideband (MBOK DS-UWB) systems. The MBOK DS-UWB systems are composed of a convolutional encoder, an interleaver and an MBOK pulse demapper. This CIDD can improve the error rate performances by applying the concept of the turbo principle into the demapping and decoding process. Simulation results show that the CIDD improves the bit error rate performances in both static and multipath fading channels in low complexity.