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Optimum arrival-time distribution for delay capture in spread-spectrum packet radio networks

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1 Author(s)
Kyungwhoon Cheun ; Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., South Korea

The optimum arrival-time distribution that maximizes the delay-capture probability in spread-spectrum packet radio networks is derived. It is shown that when the optimum arrival-time distribution is employed, the capture probability converges to a finite value as the number of contending packets increases. Normalized throughput and average number of packet retransmissions are computed for slotted ALOHA multipoint-to-point packet radio networks employing direct-sequence spread-spectrum modulation. It is shown that large performance improvement is obtained by optimizing the arrival-time distribution compared to the uniform arrival-time distribution assumed by Davis and Gronemeyer (1980), especially when error-correction coding is employed. Two practical modifications are derived which are shown to provide performance close to the optimum along with an adaptive network load control scheme

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Vehicular Technology, IEEE Transactions on  (Volume:46 ,  Issue: 4 )