Throughput enhancement of a slotted DS-CDMA ALOHA with packet combining

TitleThroughput enhancement of a slotted DS-CDMA ALOHA with packet combining
Publication TypeConference Paper
Year of Publication1997
AuthorsAnnamalai, A., R. S. C. Wong, and V. K. Bhargava
Conference NameCommunications, Computers and Signal Processing, 1997. '10 Years PACRim 1987-1997 - Networking the Pacific Rim'. 1997 IEEE Pacific Rim Conference on
Pagination506 -510 vol.2
Date Publishedaug.
Keywordsaccess protocols, adaptive time-diversity automatic repeat request scheme, automatic repeat request, channel capacity, channel utilization efficiency, code division multiple access, data communication, delay, delay performance, delays, diversity reception, error correction codes, fading, forward error correction, forward error correction coding, frequency selective Rayleigh fading channels, land mobile radio, multipath channels, multipath intensity profile, network throughput, packet combining, packet radio networks, postdetection diversity combining, pseudonoise codes, radio receivers, Rayleigh channels, receiver complexity, retransmissions, slotted DS-CDMA ALOHA, spread spectrum communication, throughput enhancement, time-varying channels, wireless data network

An adaptive time-diversity automatic repeat request scheme is investigated for a slotted DS-CDMA wireless data network over frequency selective Rayleigh fading channels. In the proposed technique, the receiver retains and processes all the retransmissions of a single data block using postdetection diversity combining rather than simply discarding the noisy packets. It is shown that packet combining is an effective mechanism for enhancing the network throughput and delay performance of a conventional DS-CDMA ALOHA, while sustaining a reasonable receiver complexity. This scheme is highly advantageous for systems which can tolerate a certain delay and operate over highly time-varying channels. We also examine the effects of forward error correction (FEC) coding and multipath intensity profile on channel utilization efficiency


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