NDLI: Improving the system capacity of a cellular network with partial power equalization

Content Provider	IEEE Xplore Digital Library
Author	Marina, N. Tirkkonen, O.
Copyright Year	2008
Description	Author affiliation: Commun. Lab., Helsinki Univ. of Technol., Espoo, Finland (Tirkkonen, O.) \|\| UNIK-Univ. Grad. Center, Univ. of Oslo, Oslo, Norway (Marina, N.)
Abstract	We derive an expression for the system capacity of a cellular network in which power equalization (PE) is applied only to the mobile stations (MS) that have stronger channel, while there is no power equalization for those with weaker channel. Power equalization means adjustment of the transmit power of each MS in order to have the same received power at the base station (BS). Systems that use matched filter receiver need power equalization. In general, however, if another reception strategy is used, the system capacity is higher if there is no power equalization. Although this strategy is optimal for the sum rate capacity, it will give an advantage to users staying very close to the BS, and is not fair. In this paper we consider a combined model in which the power equalization is done partially, i.e., stations that are closer to the BS equalize their transmit powers, while the others do not. For that reason, we define a cut-off rate beyond which no MS can transmit. This corresponds to an equivalent cut-off radius in the cell within which the transmit power of the mobile stations has to be scaled down such that all of them have the same receive power. Outside the cut-off radius all users can transmit with their maximal power (i.e. no PE is applied to them), such that the overall system capacity is increased. We derive a closed form expression in terms of the hypergeometric functions for the system capacity when partial power equalization is applied and the channel is Gaussian.
Starting Page	810
Ending Page	814
File Size	1352382
Page Count	5
File Format	PDF
ISBN	9781424424818
DOI	10.1109/EEEI.2008.4736650
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-12-03
Publisher Place	Israel
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Land mobile radio cellular systems Interference cancellation Propagation losses Fading Power control Base stations Matched filters Power system modeling Communications technology Laboratories cellular communications power equalization spectral efficiency
Content Type	Text
Resource Type	Article

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