Space-time codes for wireless optical communications

  • Authors:
  • Shane M. Haas;Jeffrey H. Shapiro;Vahid Tarokh

  • Affiliations:
  • Laboratory for Information and Decisions Systems, and Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA;Laboratory for Information and Decisions Systems, and Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA;Laboratory for Information and Decisions Systems, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA

  • Venue:
  • EURASIP Journal on Applied Signal Processing - Space-time coding and its applications - part I
  • Year:
  • 2002

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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.