DocumentCode :
2739791
Title :
A multi-user multi-beam selection scheme based on orthonormal random beamforming for mimo downlink system
Author :
Han, Feng ; Liu, Ying-zhuang ; Zhu, Guang-xi ; Sun, Jun
Author_Institution :
Dept. of Electronic and Information Engineering, Huazhong University Science and Technology, Wuhan, China
fYear :
2007
fDate :
11-13 July 2007
Firstpage :
145
Lastpage :
149
Abstract :
This paper investigates multi-user scheduling with limited feedback of partial channel state information for MIMO downlink system based on orthonormal random beamforming (ORBF). It already shows that ORBF could reduce feedback information remarkably at the same time the throughput is asymptotically optimal and scale as DPC. However ORBF yields severely degraded performance with low to moderate number of users. In this work, we present a multi-user multi-beam selection scheme based on ORBF. The core idea is to feedback more channel information for the group of users identified by ORBF so that much more sum-rate could be achieved even with low number of users. We analyze equal power allocation and adaptive power allocation among beams respectively. Simulation results show that substantial gain could be achieved at the expense of more feedback channel state information and more complexity at the transmitter.
Keywords :
MIMO; Signal to noise ratio; Transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, Circuits and Systems, 2007. ICCCAS 2007. International Conference on
Conference_Location :
Kokura
Print_ISBN :
978-1-4244-1473-4
Type :
conf
DOI :
10.1109/ICCCAS.2007.6250069
Filename :
6250069
Link To Document :
بازگشت