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Proceedings Paper

Holographic CDMA: a possible application of holography in infrared wireless communication systems
Author(s): Mohammad Abtahi; Jawad A. Salehi; Beatrice Cabon
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Paper Abstract

In this paper we describe an application of Holographic CDMA technique for indoors infrared (Optical) wireless (Free- Space) communication system. A holographic CDMA technique is a multiple access technique by which each pair of users communicate by imprinting their information on a spatial code which is recognizable or known by that pair's receiver only. We will describe the two-dimensional imaging techniques, namely user's code transmission, and highlight the basic parameters and components that need to be optimized. Then we will describe the receiver's processing module, which is comprised of a Fourier transform lens and a holographic matched-filter to decode the desired user's code successfully. Free-space optical Holographic CDMA indoor Communications processing gain can in principle be as high as 1-6-108, which results in reduction of other user's interfering effects on the desired receiver's signal. Furthermore, each user can have different modulating signals (Analog or Digital), or different information rate with any signal shape which is highly desirable for the above application.

Paper Details

Date Published: 3 October 2000
PDF: 9 pages
Proc. SPIE 4149, Holography 2000, (3 October 2000); doi: 10.1117/12.402477
Show Author Affiliations
Mohammad Abtahi, Sharif Univ. of Technology, Iran Telecom Research Ctr., and Institut National Polytechniqu (Iran)
Jawad A. Salehi, Iran Telecom Research Ctr. (Iran)
Beatrice Cabon, Sharif Univ. of Technology and Institut National Polytechnique de Grenoble (France)

Published in SPIE Proceedings Vol. 4149:
Holography 2000
Tung H. Jeong; Werner K. Sobotka, Editor(s)

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