Performance of Walsh-Hadamard transformed STBC OFDM system

We study the performance of a Walsh-Hadamard transformed (WHT) space-time block coded (STBC) OFDM system, which we refer as the WHT-STBC-OFDM system. We show that, with the WHT transform, the error performance of the STBC coded OFDM system can be improved in terms of both bit error rate (BER) and packet error rate (PER) through simple linear detection. In (L. Zhongding et al., IEEE Vehic. Tech. Conf. vol.1, p.637-640, 2003), an iterative detection scheme is proposed for a WHT-OFDM system, where significant improvement can be achieved through only linear processing. We extent the algorithm to WHT-STBC-OFDM systems and show that the BER and PER can be further reduced through iterations.