Iterative decoding for space time block coded PPM-TH UWB systems

In this paper, we analyze and simulate the iterative decoding performance of space time block coded (STBC) pulse position modulation-time hopping (PPM-TH) ultra-wideband (UWB) systems in indoor environments. The indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) channel, which is proposed as a UWB indoor channel model by IEEE 802.15.SG3a. In order to reduce the iterative decoding complexity, Max-Log-MAP algorithm is employed. The performance is evaluated in terms of bit error probability (BEP). From simulation results, it is shown that the double binary turbo coding scheme offers considerable coding gain compared with an uncoded system according as the number of iterations increases.