I. M.I. Habbab, Mohsen Kavehrad, C. E.W. Sundberg

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    The effects of capture on the average system throughput and delay performance of slotted Aloha have been analyzed for slow and fast Rayleigh fading radio channels. A short-range multipoint-to-base-station packet radio network is considered. Several different definitions of capture are considered where the bit error probability is used as a criterion. The authors show that larger capture effects and thus improved network performance can be achieved with proper choice of modulation and that the use of space diversity and/or simple error-correcting codes improves capture. It is concluded that the inverse distance variability of the received signal is the main reason for the capture effect. The Rayleigh fading alone yields a very small contribution in terms of throughput. Numerical results are presented for a slotted Aloha system with 50 users. It is found that the maximum average throughput can be increased from about 36% to almost 60% by using coding and diversity.

    Original languageEnglish (US)
    Title of host publicationUnknown Host Publication Title
    PublisherOhmsha Ltd
    Number of pages5
    ISBN (Print)4274031888
    StatePublished - Dec 1 1987

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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