Base station cooperation on the downlink: Large system analysis

Randa Zakhour, Stephen V. Hanly

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This paper considers maximizing the network-wide minimum supported rate in the downlink of a two-cell system, where each base station (BS) is endowed with multiple antennas. This is done for different levels of cell cooperation. At one extreme, we consider single cell processing where the BS is oblivious to the interference it is creating at the other cell. At the other extreme, we consider full cooperative macroscopic beamforming. In between, we consider coordinated beamforming, which takes account of inter-cell interference, but does not require full cooperation between the BSs. We combine elements of Lagrangian duality and large system analysis to obtain limiting SINRs and bit-rates, allowing comparison between the considered schemes. The main contributions of the paper are theorems which provide concise formulas for optimal transmit power, beamforming vectors, and achieved signal to interference and noise ratio (SINR) for the considered schemes. The formulas obtained are valid for the limit in which the number of users per cell, K, and the number of antennas per base station, N, tend to infinity, with fixed ratio β = K/N. These theorems also provide expressions for the effective bandwidths occupied by users, and the effective interference caused in the adjacent cell, which allow direct comparisons between the considered schemes.

LanguageEnglish
Article number6169187
Pages2079-2106
Number of pages28
JournalIEEE Transactions on Information Theory
Volume58
Issue number4
DOIs
Publication statusPublished - Apr 2012

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systems analysis
Beamforming
Base stations
interference
Systems analysis
Antennas
Bandwidth
Processing

Cite this

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title = "Base station cooperation on the downlink: Large system analysis",
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Base station cooperation on the downlink : Large system analysis. / Zakhour, Randa; Hanly, Stephen V.

In: IEEE Transactions on Information Theory, Vol. 58, No. 4, 6169187, 04.2012, p. 2079-2106.

Research output: Contribution to journalArticleResearchpeer-review

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