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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.identifier.citationSallent, J., Agusti, R. A proposal for an adaptive s-aloha access system for a mobile cdma environment. "IEEE transactions on vehicular technology", Agost 1998, vol. 47, núm. 3, p. 977-986.
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 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Comunicacions mòbils
dc.subject.lcshIntelligent transportation systems
dc.subject.otherForward error correction
dc.subject.otherAccess protocols
dc.subject.otherCode division multiple access
dc.subject.otherPacket radio networks
dc.subject.otherLand mobile radio
dc.subject.otherSpread spectrum communication
dc.subject.otherMarkov processes
dc.subject.otherTelecommunication traffic
dc.titleA proposal for an adaptive s-aloha access system for a mobile cdma environment
dc.subject.lemacSistemes de transport intel·ligent
dc.contributor.groupUniversitat Politècnica de Catalunya. GRCM - Grup de Recerca en Comunicacions Mòbils
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorSallent, J.; Agusti, R.
local.citation.publicationNameIEEE transactions on vehicular technology

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