Concatenated orthogonal/PN spreading sequences and their application to cellular DS-CDMA systems with integrated traffic

TitleConcatenated orthogonal/PN spreading sequences and their application to cellular DS-CDMA systems with integrated traffic
Publication TypeJournal Article
Year of Publication1996
AuthorsFong, M. - H., V. K. Bhargava, and Q. Wang
JournalSelected Areas in Communications, IEEE Journal on
Pagination547 -558
Date Publishedapr.
Keywordscellular DS-CDMA systems, cellular radio, channel capacity, code division multiple access, concatenated codes, concatenated orthogonal/PN spreading sequences, data communication, direct sequence code-division multiple access, fading, forward link capacity, homogenous voice traffic, integrated traffic, line rates, lognormal shadowing, multipath channels, multipath fading, parallel line rate stream, path loss, performance, pseudonoise codes, Rician channel, Rician channels, source rate, spread spectrum communication, telecommunication traffic, user capacity, video traffic, visual communication, voice communication

In this paper, we investigate the application of the concatenated orthogonal/PN spreading scheme for a cellular direct sequence code-division multiple access (DS-CDMA) system with integrated traffic. The performance of the system is evaluated in terms of user capacity. In order to incorporate traffic with a wide range of source rates, line rates (adjusted data rates before spreading) have to be selected for transmission. For traffic with source rates higher than the line rate of concern, we propose the use of concatenated orthogonal/PN spreading sequences to subdivide a high rate stream into parallel line rate streams. Therefore, in this paper, we first analyze the properties of the concatenated orthogonal/PN spreading sequences. The results are used to evaluate their performance for homogenous voice traffic in various cellular mobile environments with multipath fading, lognormal shadowing, and path loss. Our results show that the proposed spreading scheme offers a significant improvement in the forward link capacity as compared to using the conventional nonconcatenated long PN sequence, especially if the multipath fading is Rician (e.g., microcellular and indoor picocellular systems). Incorporating the notion of line rate, we then evaluate the performance of a system with integrated voice and video traffic. Special emphasis is placed on the effect of line rate selection on the overall capacity which leads to the optimal selection of line rates


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