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1 May 2009 Space-time processing for OFDM using complementary Golay sequences
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In this paper, a new method of space-time processing is proposed for Orthogonal Frequency Division Multiplexing (OFDM) using complementary pairs of Golay sequences. Space-time processing with complementary Golay sequences provides diversity at the transmitter which in turn helps improve performance in multipath fading channels without the need for channel knowledge at the transmitter. The autocorrelative properties of complementary Golay pairs allows multiple data signals at the transmitter to be perfectly separated at the receiver. Further, these properties significantly boost the signal energy at the receiver, leading to a higher SNR and thus better bit error performance. Building on work done in the field of orthogonal space-time block codes, the new Golay method is proposed and derived for both a 2×1 and 2×2 MIMO-OFDM system with a channel exhibiting Rayleigh fading; at the receiver, symbol estimation is effected via minimum mean-square estimation (MMSE).
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Chad C. Lau, Muthanna Al-Mahmoud, and Michael D. Zoltowski "Space-time processing for OFDM using complementary Golay sequences", Proc. SPIE 7349, Wireless Sensing and Processing IV, 734904 (1 May 2009);

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