Near-far effect on slotted ALOHA channels with shadowing and capture

Signal statistics are modelled in an environment of shadowing and ground wave path loss. This propagation model is used to investigate the channel performance of a slotted ALOHA network. The results are presented as receiver capture probability vs. packet propagation distance, with the log-normal variance and the offered traffic as parameters. Log-normal spatial distributions and uniform distributions of users over the coverage area are compared. The former facilitate the analysis of mobile packet-radio channels with near-far effect and shadowing and can often approximate the latter type of distribution. It is shown that stability and throughput cannot be realistically studied by (quasi-) uniform distributions. The log-normal subscriber density with a spatial spread of 8.68 dB gives a viable alternative to the study of the heavily loaded collision-type multiple-access channel.<<ETX>>

[1]  Irene A. Stegun,et al.  Handbook of Mathematical Functions. , 1966 .

[2]  J. P. Linnartz,et al.  Spatial distributions of traffic in a mobile ALOHA network , 1988, 8th European Conference on Electrotechnics, Conference Proceedings on Area Communication.

[3]  Ramjee Prasad,et al.  Comments on "Analysis for spectrum efficiency in single cell trunked and cellular mobile radio , 1988 .

[4]  A.A.M. Saleh,et al.  The near/far effect in local ALOHA radio communications , 1987, IEEE Transactions on Vehicular Technology.

[5]  Y. Akaiwa,et al.  Analysis for spectrum efficiency in single cell trunked and cellular mobile radio , 1987, IEEE Transactions on Vehicular Technology.

[6]  Christian Namislo.  Analysis of mobile radio slotted ALOHA networks , 1984, IEEE Transactions on Vehicular Technology.

[7]  J. Egli.  Radio Propagation above 40 MC over Irregular Terrain , 1957, Proceedings of the IRE.

[8]  Norman Abramson,et al.  The Throughput of Packet Broadcasting Channels , 1977, IEEE Trans. Commun..

[9]  Jens C. Arnbak,et al.  Capacity of Slotted ALOHA in Rayleigh-Fading Channels , 1987, IEEE J. Sel. Areas Commun..

[10]  Norman M. Abramson,et al.  Development of the ALOHANET , 1985, IEEE Trans. Inf. Theory.

[11]  S. Schwartz,et al.  On the distribution function and moments of power sums with log-normal components , 1982, The Bell System Technical Journal.

[12]  J. Metzner,et al.  On Improving Utilization in ALOHA Networks , 1976, IEEE Trans. Commun..

[13]  R. Prasad,et al.  Effects of Rayleigh fading on packet radio channels with shadowing , 1989, Fourth IEEE Region 10 International Conference TENCON.

[14]  Jpmg Jean-Paul Linnartz,et al.  Spatial distribution of traffic in a cellular mobile data network , 1987 .

[15]  Ramjee Prasad,et al.  Enhanced throughput in packet radio channels with shadowing , 1988 .