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Peter Olsovsky
Peter Podhoransky

Author(s) and WSEAS

Peter Olsovsky
Peter Podhoransky

WSEAS Transactions on Communications

Print ISSN: 1109-2742
E-ISSN: 2224-2864

Volume 16, 2017

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of WSEAS Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

Design and Analysis of a Modified Algorithm for the Maximum Likelihood Parallel Search Technique for DSSS Signals

AUTHORS: Peter Olsovsky, Peter Podhoransky

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ABSTRACT: This paper investigates the problems of pseudorandom noise (PN) code acquisition techniques in direct-sequence code division multiple access (DS-CDMA) communication systems. PN code acquisition (or PN code synchronization) is the most essential first-stage processing in a DS-CDMA receiver. To speed up the multiple access process, initial synchronization should be performed in minimal time. PN code acquisition refers to the operation of synchronizing the locally generated PN code with the received PN code within one chip interval, beyond which the tracking process takes charge. This paper presents the interesting characteristics of effective PN code acquisition techniques for DS-CDMA systems. The techniques described in this paper are generally capable of determining the received PN code phase to within an accuracy of ±1 ⁄ 2 to ±1 ⁄ 4 of a chip. The aim of this paper is to propose the modified algorithm for parallel search realization of the maximum likelihood search technique for direct-sequence spread spectrum (DSSS) signals in MATLAB. In addition, the universal autonomous algorithm in MATLAB for PN code generation using a linear feedback shift register is proposed.

KEYWORDS: Direct-Sequence Code Division Multiple Access (DS-CDMA), Synchronization, PN Code Acquisition, Search Techniques, MATLAB


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WSEAS Transactions on Communications, ISSN / E-ISSN: 1109-2742 / 2224-2864, Volume 16, 2017, Art. #46, pp. 412-420

Copyright © 2017 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution License 4.0

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