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29 March 2024 |
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Article overview
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Space Codes for MIMO Optical Wireless Communications: Error Performance Criterion and Code Construction | Yan-Yu Zhang
; Hong-Yi Yu
; Jian-Kang Zhang
; Yi-Jun Zhu
; Jin-Long Wang
; Tao Wang
; | Date: |
24 Sep 2015 | Abstract: | In this paper, we consider a multiple-input-multiple-output optical wireless
communication (MIMO-OWC) system in the presence of log-normal fading. In this
scenario, a general criterion for the design of full-diversity space code
(FDSC) with the maximum likelihood (ML) detector is developed. This criterion
reveals that in a high signal-to-noise ratio (SNR) regime, MIMO-OWC offers both
large-scale diversity gain, governing the exponential decaying of the error
curve, and small-scale diversity gain, producing traditional power-law
decaying. Particularly for a two by two MIMO-OWC system with unipolar pulse
amplitude modulation (PAM), a closed-form solution to the design problem of a
linear FDSC optimizing both diversity gains is attained by taking advantage of
the available properties on the successive terms of Farey sequences in number
theory as well as by developing new properties on the disjoint intervals formed
by the Farey sequence terms to attack the continuous and discrete variables
mixed max-min design problem. In fact, this specific design not only proves
that a repetition code (RC) is the optimal linear FDSC optimizing both the
diversity gains, but also uncovers a significant difference between MIMO radio
frequency (RF) communications and MIMO-OWC that space dimension alone is
sufficient for a full large-scale diversity achievement. Computer simulations
demonstrate that FDSC substantially outperforms uncoded spatial multiplexing
with the same total optical power and spectral efficiency, and the latter
provides only the small-scale diversity gain. | Source: | arXiv, 1509.7470 | Services: | Forum | Review | PDF | Favorites |
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