Title :
A simple joint beamforming and power control algorithm for multi-user MIMO wireless networks
Author :
Song, Bongyong ; Cruz, Rene L. ; Rao, Bhaskar D.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California, La Jolla, CA, USA
Abstract :
We consider the joint optimization of transmitted power, receive and transmit beamforming vectors for multi-user MIMO wireless networks. Specifically, they are optimized such that the total transmit power is minimized while satisfying SINR requirements of all links. We first analytically show that maximum ratio transmission (MRT) beamforming is asymptotically optimal for the low SINR region and the corresponding optimal transmit power vector is element-wise minimal. We then propose a simple joint optimization algorithm tailored for cellular downlinks by exploiting network duality, which is applicable over a wide range of SINR. The proposed algorithm can be readily implemented in a distributed fashion since it requires only local adaptive beamforming at the receivers, a simple power control loop, and minimal feedback of the channel state information. Also, the algorithm achieves a performance close to that of centralized iterative optimization algorithms, and outperforms other decentralized approaches that have been previously proposed.
Keywords :
MIMO systems; adaptive signal processing; beam steering; cellular radio; multiuser channels; optimisation; power control; state feedback; SINR requirements; cellular downlink; joint beamforming/power control algorithm; maximum ratio transmission beamforming; minimal channel state information feedback; multiuser MIMO wireless networks; network duality; power control loop; receive/transmit beamforming vectors; receiver local adaptive beamforming; total transmit power minimization; transmitted power optimization; Adaptive control; Array signal processing; Cellular networks; Downlink; Iterative algorithms; MIMO; Power control; Programmable control; Signal to noise ratio; Wireless networks;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1399981