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Proceedings Paper

Equalization for wireless optical communications over multipath channels
Author(s): John R. Barry
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Paper Abstract

We review the advantages of digital pulse-position modulation (PPM) for wireless infrared communications, and then examine several equalization strategies for detecting PPM signals in the presence of intersymbol interference and additive white Gaussian noise. Our approach is based on an equivalent vector channel, obtained by viewing PPM as a binary block code, and we use this vector channel to derive the ML sequence detector. We also propose three sub- optimal block-by-block detectors, all of which use block decision-feedback equalization (DFE) to mitigate inter-block interference but differ in how they mitigate intra-block interference: the ML-BDFE accounts for it in an optimal way, the comparator-BDFE uses linear equalization, and the correcting-scalar-DFE uses DFE. We illustrate low-complexity implementations of these equalizers, and compare their performance to the ML detector using Monte-Carlo simulations.

Paper Details

Date Published: 6 June 1995
PDF: 12 pages
Proc. SPIE 2426, 9th Meeting on Optical Engineering in Israel, (6 June 1995); doi: 10.1117/12.211241
Show Author Affiliations
John R. Barry, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 2426:
9th Meeting on Optical Engineering in Israel
Itzhak Shladov; Yitzhak Wiessman; Natan Kopeika, Editor(s)

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