Waterfilling Schemes for Zero-Forcing Coordinated Base Station Transmission

In this work we consider the optimization of the power assigned to the user streams, in a coordinated base station downlink environment, when zero-forcing is employed to remove interference among users. Two schemes based on the waterfilling technique are proposed and compared to the optimal solution...

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Bibliographic Details
Published inGLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference pp. 1 - 5
Main Authors Armada, A.G., Sanchez-Fernandez, M., Corvaja, R.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2009
Subjects
Base stations
Covariance matrix
Downlink
Electronic mail
Frequency
Interference cancellation
Land mobile radio cellular systems
MIMO
Signal to noise ratio
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Summary:In this work we consider the optimization of the power assigned to the user streams, in a coordinated base station downlink environment, when zero-forcing is employed to remove interference among users. Two schemes based on the waterfilling technique are proposed and compared to the optimal solution, which can be obtained numerically, by using convex optimization. We show that the proposed schemes achieve a performance, in terms of weighted sum rate, very close to the optimal, without the heavy computational complexity required by the numerical solution. The sum rates are compared in a realistic multi-cell scenario and some examples of achievable rates are presented also in a simplified two-user two-cell case.
ISBN:9781424441488
142444148X
ISSN:1930-529X
2576-764X
DOI:10.1109/GLOCOM.2009.5425267