Open Access

Space-Time Codes for Wireless Optical Communications

EURASIP Journal on Advances in Signal Processing20022002:478950

https://doi.org/10.1155/S1110865702000604

Received: 1 June 2001

Published: 18 March 2002

Abstract

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.

Keywords

space-time codes optical communication orthogonal designs

Authors’ Affiliations

(1)
Laboratory for Information and Decisions Systems, and Research Laboratory of Electronics, Massachusetts Institute of Technology
(2)
Laboratory for Information and Decisions Systems, Massachusetts Institute of Technology

Copyright

© Haas et al. 2002