DocumentCode :
3512149
Title :
A random beamforming technique in MIMO systems exploiting multiuser diversity
Author :
Hwang, Chan-Soo ; Chung, Jaehak ; Kim, Yungsoo ; Nam, Seung Hoon
Author_Institution :
Lab. of i-Networking, Samsung, Suwon, South Korea
Volume :
5
fYear :
2003
fDate :
11-15 May 2003
Abstract :
A random beamforming technique for MIMO systems that simultaneously obtains downlink multiuser diversity gain, spatial multiplexing gain, and array gain by feeding back only effective SNRs is described. In addition, power control using waterfilling is employed to improve the throughput of our method. In a slow fading channel, we prove that the throughput of the proposed method converges to that of eigen beamforming when many users are in a cell. The number of users required to achieve capacity bound increases with the number of antennas and SNR. However, the capacity bound is achieved even with a small number of users, e.g. 16 users is a cell, when the SNR is low, e.g., 0 dB, and the number of transmit and receive antenna is small, e.g., 2.
Keywords :
MIMO systems; antenna arrays; array signal processing; cellular radio; channel capacity; correlation theory; diversity reception; fading channels; multiplexing; MIMO systems; SNR; array gain; downlink multiuser diversity gain; eigen beamforming; power control; random beamforming technique; signal to noise ratio; slow fading channel; spatial multiplexing gain; waterfilling; Array signal processing; Channel capacity; Diversity methods; Downlink; Fading; Feedback; MIMO; Receiving antennas; Throughput; Transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2003. ICC '03. IEEE International Conference on
Print_ISBN :
0-7803-7802-4
Type :
conf
DOI :
10.1109/ICC.2003.1204031
Filename :
1204031
Link To Document :
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