EURASIP Journal on Advances in Signal Processing 
Volume 2008 (2008), Article ID 741593, 9 pages
doi:10.1155/2008/741593
Research Article

Low-Complexity Distributed Multibase Transmission and Scheduling

Hilde Skjevling,1 David Gesbert,2 and Are Hjørungnes3

 1Department of Informatics, University of Oslo, P. O. Box 1080, Blindern, 0316 Oslo, Norway
2Mobile Communications Department, Eurécom Institute, 2229 Route des Crêtes, BP 193, 06904 Sophia Antipolis Cédex, France
3UNIK-University Graduate Center, University of Oslo, Instituttveien 25, P. O. Box 70, 2027 Kjeller, Norway
Received 1 May 2007; Revised 16 October 2007; Accepted 25 November 2007

Recommended by M. Chakraborty

Abstract

This paper addresses the problem of base station coordination and cooperation in wireless networks with multiple base stations. We present a distributed approach to downlink multibase beamforming, which allows for the multiplexing of M user terminals, randomly located in a network with N base stations. In particular, we detail a low-complexity scheduling algorithm, which can be employed with different objective functions, exemplified here by two approaches: (1) maximizing the sum rate of the network; and (2) maximizing the number of users served, given a statistical constraint on the received rate per user. The optimizations are based on locally available information at each base station. Results show that our approaches yield significant gains, when compared to schemes that do not allow cooperation between cells. These gains are obtained without the extensive signaling overhead required in previously known multicell MIMO processing.