ALOHA packet system with and without slots and capture
ACM SIGCOMM Computer Communication Review
THE ALOHA SYSTEM: another alternative for computer communications
AFIPS '70 (Fall) Proceedings of the November 17-19, 1970, fall joint computer conference
ALOHA packet broadcasting: a retrospect
AFIPS '75 Proceedings of the May 19-22, 1975, national computer conference and exposition
Capacity of Slotted ALOHA in Rayleigh-Fading Channels
IEEE Journal on Selected Areas in Communications
ALOHA with capture over slow and fast fading radio channels with coding and diversity
IEEE Journal on Selected Areas in Communications
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The effect of the capture phenomenon on the throughput of a radio communications system using the Aloha random access protocol with variable length packets is examined. In a packet radio communications system, the base station typically receives stronger signals from near users than from far users, leading to the so-called 'near/far effect'. The packet capture phenomenon, in which a packet captures the base station receiver when its signal-to-interface ratio exceeds some threshold, is a consequence of the near/far effect. System throughput with capture is obtained analytically in terms of a tagged packet's conditional capture probability using the most general packet length distribution, i.e. packet length is taken to be exponentially distributed. The maximum throughput and the channel traffic rate corresponding to the maximum throughput of a variable packet Aloha system with capture are both considerably higher than that of a comparable system without capture. Depending on the threshold, the maximum throughput and the channel traffic rate corresponding to maximum throughput of a variable packet Aloha system with capture can be as much as 67% and 120% higher (resp.) than that of a comparable system without capture. Consequently, not only throughput but also the stability of the system is enhanced by the capture effect.