Throughput analysis of multichannel slotted ALOHA systems in multiple log-normal and Rayleigh interferers environment

Zhang, Z.; Liu, Y.-J.

doi:10.1109/vetec.1992.245398

Cited by 9 publications

(2 citation statements)

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“…1214 0743-166W93 $03.00 0 1993 IEEE I I Much research has already been devoted to slotted/unslotted ALOHA protocols, e.g. [3], or CDMA access protocols with all users assigned with different spreading code sequence, e.g. [4].…”

Section: Introductionmentioning

confidence: 99%

“…0 5 15 min(M, R), 0 5 k 5 N -I , ( " ) q;'+'-'(l -ql)'S(c, In, M -i , R -i ) (7)where a = k -j + e, and q1 = *, L being the packet length, and S(c, In, M , R) is given by(3).Let P = (Pij f k ) be the probability transition matrix and ll = { r i j } den'ote the steady-The system throughput 81, which is defined as the average number of packets transmitted per chip time, can be obtained as follows:el = C(N -i -j ) A T i j .The channel throughput (defined as the average number of packets transmitted per slot per channel) is given by81 L e, = -M noting that there are L chip times per packet. vious sections and is given by, in chip times, The packet delay is obtained similarly as in the pre-E ( D ) = -N 1 --el A + ' .…”

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confidence: 99%

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Performance analysis of multiple access protocols for CDMA cellular and personal communications services

Zhang

Liu²

IEEE INFOCOM '93 the Conference on Computer Communications, Proceedings

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I n this paper, we investigate the performance of a DS/CDMA spreading ALOHA access protocol, which can be applied to the wireless data network and personal communications services. The DS/CDMA spreading A L O H A system access protocol, combining the characteristics of both spread spectrum techniques and A L O H A random access protocols, can provide a higher throughput than the conventional A L O H A scheme. Exact analysis f o r such a system access protocol is extremely difficult. B y using a Markov model, we are able to derive upper and lower bounds of the throughput of the underlying system. Time-driven simulation is also performed to investigate the tightness of the bounds. The results indicate that the upper bound is very tight. Numerical results also show that,.unlike the conventional A L O H A system, the DS/CDMA spreading mini-slotted A L O H A system provides better delay and throughput performance than the DS/CDMA spreading slotted A L O H A system.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%