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Construction of Wavelength/Time Codes for Fiber-Optic CDMA Networks

Shivaleela, ES and Srinivas, T (2007) Construction of Wavelength/Time Codes for Fiber-Optic CDMA Networks. In: IEEE Journal of Selected Topics in Quantum Electronics, 13 (5). pp. 1370-1377.


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Fiber-optic code-division multiple-access (FOCDMA)technology for high-speed access networks has attracted a lot of attention recently. Constructions of 2-D codes, suitable for incoherent wavelength/time (W/T) FO-CDMA, have been proposed to reduce the time spread of the 1-D sequences. The W/T construction of codes can be broadly classified as 1) hybrid sequences and 2) matrix codes. Earlier, we reported a new family of unipolar wavelength/time multiple-pulses-per-row (W/T MPR) matrix codes that have good cardinality, spectral efficiency and at the same time have the lowest off-peak autocorrelation and cross-correlation values equal to unity. In this paper, we propose an algorithm to construct W/T MPR codes, starting with distinct 1-D optical orthogonal codes (OOCs) of a family as the row vectors of the code. The 2-D optical orthogonal signature pattern codes (OOSPCs), which are also constructed from 1-D OOCs, need much higher temporal length than that of W/T MPR codes, to construct codes of given cardinality and weight. Representation of the results of the codes generated using the algorithm are presented and the correlation properties are verified. We have analyzed the performance of the W/T MPR codes considering multiple access interference as the main source of noise. Also, we have compared cardinality and spectral efficiency of the codes with other W/T codes.

Item Type: Journal Article
Publication: IEEE Journal of Selected Topics in Quantum Electronics
Publisher: IEEE
Additional Information: Copyright 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Fiber-optics (FO) communication;incoherent optical communications;optical code-division multiple access (CDMA);wavelength/time codes.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 29 Jul 2008
Last Modified: 19 Sep 2010 04:48
URI: http://eprints.iisc.ac.in/id/eprint/15315

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