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Title:
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A proposal for an adaptive S-ALOHA access system for a mobile CDMA environment
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Author:
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Sallent Roig, José Oriol; Agustí Comes, Ramon
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. GRCM - Grup de Recerca en Comunicacions Mòbils |
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Abstract:
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This 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. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Comunicacions mòbils
-Mobile communication systems
-Access protocols
-Adaptive direct-sequence code-division multiple-access
-Adaptive S-ALOHA access system
-Base-station
-Forward-error-correction coding
-Land mobile radio
-Low-complexity
-Markov chain model
-Message delay delivery
-Mobile CDMA environment
-Mobile-station
-Packet radio networks
-Packet random-access scheme
-Saturation point
-Slotted-ALOHA
-Spread spectrum communication
-Statistical length distribution
-Telecommunication traffic
-Traffic load
-Traffic model
-Transmission rate
-Transmitter-based spreading codes
-BS
-DS-CDMA
-FEC
-MS
-S-ALOHA
-Sistemes de comunicacions mòbils |
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Rights:
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Document type:
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Article |
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Published by:
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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