On the performance of pre-transformed space-time block coded OFDM systems

Authors:
Wu Yan;Ho Chin Keong;Sumei Sun
Affiliations:
Department of Electrical Engineering, Eindhoven University of Technology, The Netherlands;Institute for Infocomm Research, Singapore;Institute for Infocomm Research, Singapore
Venue:
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Year:
2009

Citing 4
Cited 0

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Abstract

In a previous work by Wu et al., it is shown that the performance of the pre-transformed space-time block coded orthogonal frequency division multiplexing (PT-STBC-OFDM) system has much superior performance compared to the normal STBC-OFDM system. In this paper, we present an analytical study on the bit error rate (BER) of the PT-STBC-OFDM system. We derive the noise distribution of PT-STBC-OFDM system and hence, obtain the BER numerically. We also derived two closed-form BER approximations for the PT-STBC-OFDM system at two different SNR regions. We show that by adding the PT operation, the system has better diversity compared to STBC-OFDM system at the medium SNR region. Using linear detection, the diversity of both systems at the high SNR regions are the same. Moreover, we demonstrate that at high SNR, a PT-STBC-OFDM system of transform size N requires 5 log10(N) dB less SNR to achieve the same BER as without PT.