Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Optimum SIR balancing using extended 1norm beamforming optimization
 IEEE Signal Processing Society: IEEE International Conference on Acoustics, Speech, and Signal Processing 2002. Proceedings. Vol.3: Signal processing for communications, sensor array and multichannel signal processing, design and implementation of signal processing systems : May 13  17, 2002, Renaissance Orlando Resort, Orlando, Florida, USA Piscataway: IEEE Operations Center, 2002 ISBN: 0780374029 S.29452948 
 International Conference on Acoustics, Speech, and Signal Processing (ICASSP) <2002, Orlando/Fla.> 

 Englisch 
 Konferenzbeitrag 
 Fraunhofer HHI () 
 array signal processing; cellular radio; convergence of numerical methods; iterative methods; optimisation; power control; radio links; radiofrequency interference; telecommunication control; joint downlink beamforming; optimum sir balancing; extended 1norm beamforming optimization; wireless cellular system; frequency band sharing; time slot sharing; iterative algorithm; 1norm cost function; optimum infinity norm solution; convergence 
Abstract
We address the problem of joint downlink beamforming and power control in a wireless cellular system, where several users share the same time slot and the same frequency band. In order to enable a fair sharing of resources among all users, the SIR levels should be balanced by minimizing the infinity norm of a certain vector. To this end, Gerlach and Paulraj (1996) proposed an iterative algorithm, which is based on a 1norm cost function. It has been observed that this algorithm approximates the optimum infinity norm solution. In this paper we characterize the case where this algorithm is optimal. The analytical results are used to develop a new algorithm, which always converges to the optimum infinity norm solution, regardless of the chosen initialization. A proof of convergence is given.