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Article: Performance of direct-sequence spread-spectrum multiple-access systems in mobile radio

TitlePerformance of direct-sequence spread-spectrum multiple-access systems in mobile radio
Authors
Issue Date1991
Citation
Iee Proceedings, Part I: Communications, Speech And Vision, 1991, v. 138 n. 1, p. 1-14 How to Cite?
AbstractThe performance of coherent direct-sequence spread-spectrum multiple-access (DS/ SSMA) communnications over different mobile radio channels is investigated. Analytical techniques and numerical methods were used for a channel having a number of resolvable, discrete Rayleigh fading paths, while simulations were employed for transmissions over urban mobile radio channels. We found that even a flat Rayleigh fading channel caused a severe degradation in system performance compared with the additive white Gaussian noise channel, and that the system was unusable even for a few users when a wideband urban mobile radio channel was used. By transmitting a sounding sequence of chip length NS = 511 to allow the receiver to estimate the channel impulse response, spreading the symbol over N = 127 chips, and on deploying fifth-order combinative space diversity equipped with adaptive correlation diversity of Kβ = 1.0 (CD/ACD), we were able to obtain a residual probability of bit error PR of less than 10-3 for 10 users, in spite of the urban mobile radio channel having 19 resolvable fading paths. By increasing N to 511 and deploying fifth-order maximal-radio-combining (MRC) space diversity, a PR of 4 × 10-5 for 20 users was achieved when the radio channel consisted of 10 resolvable independent Rayleigh fading paths.
Persistent Identifierhttp://hdl.handle.net/10722/154938
ISSN

 

DC FieldValueLanguage
dc.contributor.authorLam, WHen_US
dc.contributor.authorSteele, Ren_US
dc.date.accessioned2012-08-08T08:31:13Z-
dc.date.available2012-08-08T08:31:13Z-
dc.date.issued1991en_US
dc.identifier.citationIee Proceedings, Part I: Communications, Speech And Vision, 1991, v. 138 n. 1, p. 1-14en_US
dc.identifier.issn0956-3776en_US
dc.identifier.urihttp://hdl.handle.net/10722/154938-
dc.description.abstractThe performance of coherent direct-sequence spread-spectrum multiple-access (DS/ SSMA) communnications over different mobile radio channels is investigated. Analytical techniques and numerical methods were used for a channel having a number of resolvable, discrete Rayleigh fading paths, while simulations were employed for transmissions over urban mobile radio channels. We found that even a flat Rayleigh fading channel caused a severe degradation in system performance compared with the additive white Gaussian noise channel, and that the system was unusable even for a few users when a wideband urban mobile radio channel was used. By transmitting a sounding sequence of chip length NS = 511 to allow the receiver to estimate the channel impulse response, spreading the symbol over N = 127 chips, and on deploying fifth-order combinative space diversity equipped with adaptive correlation diversity of Kβ = 1.0 (CD/ACD), we were able to obtain a residual probability of bit error PR of less than 10-3 for 10 users, in spite of the urban mobile radio channel having 19 resolvable fading paths. By increasing N to 511 and deploying fifth-order maximal-radio-combining (MRC) space diversity, a PR of 4 × 10-5 for 20 users was achieved when the radio channel consisted of 10 resolvable independent Rayleigh fading paths.en_US
dc.languageengen_US
dc.relation.ispartofIEE Proceedings, Part I: Communications, Speech and Visionen_US
dc.titlePerformance of direct-sequence spread-spectrum multiple-access systems in mobile radioen_US
dc.typeArticleen_US
dc.identifier.emailLam, WH:whlam@eee.hku.hken_US
dc.identifier.authorityLam, WH=rp00136en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0026111208en_US
dc.identifier.volume138en_US
dc.identifier.issue1en_US
dc.identifier.spage1en_US
dc.identifier.epage14en_US
dc.identifier.scopusauthoridLam, WH=7203021916en_US
dc.identifier.scopusauthoridSteele, R=7402222998en_US

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