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Space-Time Codes for Wireless Optical Communications


A space-time channel coding technique is presented for overcoming turbulence-induced fading in an atmospheric optical heterodyne communication system that uses multiple transmit and receive apertures. In particular, a design criterion for minimizing the pairwise probability of codeword error in a space-time code (STC) is developed from a central limit theorem approximation. This design criterion maximizes the mean-to-standard-deviation ratio of the received energy difference between codewords. It leads to STCs that are a subset of the previously reported STCs for Rayleigh channels, namely those created from orthogonal designs. This approach also extends to other fading channels with independent, zero-mean path gains. Consequently, for large numbers of transmit and receive antennas, STCs created from orthogonal designs minimize the pairwise codeword error probability for this larger class of fading channels.

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Correspondence to Shane M. Haas.

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Haas, S.M., Shapiro, J.H. & Tarokh, V. Space-Time Codes for Wireless Optical Communications. EURASIP J. Adv. Signal Process. 2002, 478950 (2002).

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