Concatenated orthogonal/PN spreading scheme for cellular DS-CDMA systems with integrated traffic

TitleConcatenated orthogonal/PN spreading scheme for cellular DS-CDMA systems with integrated traffic
Publication TypeConference Paper
Year of Publication1995
AuthorsFong, M. - H., V. K. Bhargava, and Q. Wang
Conference NameCommunications, 1995. ICC '95 Seattle, 'Gateway to Globalization', 1995 IEEE International Conference on
Pagination905 -909 vol.2
Date Publishedjun.
Keywordscapacity, cellular DS-CDMA systems, cellular mobile environments, cellular radio, channel capacity, code division multiple access, concatenated codes, concatenated orthogonal/PN spreading scheme, cosets, fading, high rate stream, homogenous voice traffic, integrated traffic, interference suppression, land mobile radio, log normal distribution, log-normal shadowing, multi-user interference, multipath channels, multipath fading, parallel line rate streams, path loss, performance, pseudonoise codes, radiofrequency interference, source coding, source rates, speech coding, spread spectrum communication, telecommunication traffic, video, video coding, visual communication, voice communication, Walsh-Hadamard codes

The application of the concatenated orthogonal/PN spreading scheme for integrated traffic is introduced. Bhargava (1994) proposed using a single line rate (adjusted data rate before spreading) to accommodate traffic with a wide range of source rates. For traffic with source rates higher than the line rate, the authors propose using concatenated orthogonal/PN spreading sequences to subdivide a high rate stream into several parallel line rate streams. The performance of the concatenated orthogonal-PN spreading sequence for homogenous voice traffic in various cellular mobile environments with multipath fading, log-normal shadowing and path loss, is first analyzed and compared with that of the conventional non-concatenated long PN sequence. The authors then evaluate the performance of a system with integrated traffic of voice and video. In conjunction with this, they propose the use of cosets of Walsh-Hadamard (WH) codes to reduce the multi-user interference. Different methods of assigning the spreading sequences among the cosets which improve the capacity of both voice and video users, are investigated


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