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dc.contributor.authorSallent Roig, José Oriol
dc.contributor.authorAgustí Comes, Ramon
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.date.accessioned2008-03-26T10:34:08Z
dc.date.available2008-03-26T10:34:08Z
dc.date.created1996-04-07
dc.date.issued1998-08
dc.identifier.citationSallent Roig, J.O; Agustí Comes, R. A proposal for an adaptive S-ALOHA access system for a mobile CDMA environment. IEEE Transactions on Vehicular Technology, 1998, vol. 47, núm. 3, pàg. 977-986
dc.identifier.issn0018-9545
dc.identifier.urihttp://hdl.handle.net/2117/1915
dc.description.abstractThis paper presents a novel adaptive direct-sequence code-division multiple-access (DS-CDMA) slotted-ALOHA (S-ALOHA) packet random-access scheme with transmitter-based spreading codes for mobiles. It is aimed at improving throughput and message delay delivery when traffic load values below the saturation point of the conventional DS-CDMA S-ALOHA system are sensed in the channel. For this purpose, one mobile-station (MS) and two base-station (BS)-assisted algorithms are envisaged to control the change of the transmission rate according to the traffic load. These algorithms revealed that the optimum behavior, obtained using a Markov chain model, may almost be reached at a low-complexity cost. A traffic model based on a realistic statistical length distribution of the messages illustrates how the delay delivery can be greatly reduced with the proposed algorithms. Finally, the impact of forward-error-correction (FEC) coding on the adaptive system is also studied.
dc.format.extent10
dc.language.isoeng
dc.publisherIEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Comunicacions mòbils
dc.subject.lcshMobile communication systems
dc.subject.otherAccess protocols
dc.subject.otherAdaptive direct-sequence code-division multiple-access
dc.subject.otherAdaptive S-ALOHA access system
dc.subject.otherBase-station
dc.subject.otherForward-error-correction coding
dc.subject.otherLand mobile radio
dc.subject.otherLow-complexity
dc.subject.otherMarkov chain model
dc.subject.otherMessage delay delivery
dc.subject.otherMobile CDMA environment
dc.subject.otherMobile-station
dc.subject.otherPacket radio networks
dc.subject.otherPacket random-access scheme
dc.subject.otherSaturation point
dc.subject.otherSlotted-ALOHA
dc.subject.otherSpread spectrum communication
dc.subject.otherStatistical length distribution
dc.subject.otherTelecommunication traffic
dc.subject.otherTraffic load
dc.subject.otherTraffic model
dc.subject.otherTransmission rate
dc.subject.otherTransmitter-based spreading codes
dc.subject.otherBS
dc.subject.otherDS-CDMA
dc.subject.otherFEC
dc.subject.otherMS
dc.subject.otherS-ALOHA
dc.titleA proposal for an adaptive S-ALOHA access system for a mobile CDMA environment
dc.typeArticle
dc.subject.lemacSistemes de comunicacions mòbils
dc.contributor.groupUniversitat Politècnica de Catalunya. GRCM - Grup de Recerca en Comunicacions Mòbils
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.relation.projectidcttTIC-94-0870-C02-01
local.personalitzacitaciotrue


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