DMCA
Two-dimensional binary halftoned optical intensity channels (2008)
| Venue: | IET Commun |
| Citations: | 2 - 2 self |
BibTeX
@ARTICLE{Mohamed08two-dimensionalbinary,
author = {Mohamed D. A. Mohamed and Steve Hranilovic},
title = {Two-dimensional binary halftoned optical intensity channels},
journal = {IET Commun},
year = {2008},
pages = {11--17}
}
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Abstract
This paper considers the capacity of two-dimensional optical intensity channels in which transmit images are constrained to be binary-level. Examples of such links exist in holographic storage, page-oriented memories, optical interconnects, two-dimensional barcodes, as well as MIMO wireless optical links. Data are transmitted by sending a series of time-varying binary-level optical intensity images from transmitter to receiver. Strict spatial alignment between transmitter and receiver is not required nor is inde-pendence among the spatial channels assumed. Our approach combines spatial discrete multitone modulation developed for spatially frequency selective channels with halfton-ing to produce a binary-level output image. Data is modulated in spatial frequency domain as dictated by a water pouring spectrum over the optical transfer function as well as channel and quantization noise. A binary-level output image is produced by exploiting the excess spatial bandwidth available at the transmitter to shape quan-tization noise out of band. We present a general mathematical framework in which such systems can be analyzed and designed. In a pixelated wireless optical channel application, halftoning achieves 99.8 % of the capacity of an equivalent unconstrained continuous amplitude channel using 1 megapixel arrays. Index Terms: two-dimensional wireless optical channels, wireless infrared communica-tions, optical intensity modulation, halftoning, holographic storage, page-oriented memories, optical interconnects, two-dimensional barcodes, MIMO wireless optical links, pixelated op-tical channels.
Keyphrases
optical intensity channel two-dimensional binary two-dimensional barcodes holographic storage page-oriented memory optical interconnects binary-level output image spatial discrete multitone modulation spatial channel time-varying binary-level optical intensity image optical intensity modulation general mathematical framework optical link quan-tization noise pixelated wireless optical channel application spatial frequency domain frequency selective channel op-tical channel two-dimensional optical intensity channel two-dimensional wireless optical channel index term transmit image continuous amplitude channel quantization noise optical transfer function excess spatial bandwidth mimo wireless optical link strict spatial alignment megapixel array
