Title :
Multimode Random Beamforming for Multiuser Downlink MIMO System with Limited Feedback
Author :
Chae, Hyukjin ; Kim, Yohan ; Yang, Janghoon ; Ihm, Bin-chul ; Kim, Dong Ku
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul
Abstract :
Multimode transmission has been studied to improve BER and outage capacity in the point-to-point system. In this paper, we consider the multimode transmission for downlink MIMO based on random beamforming(RBF) with limited feedback. We propose four heuristic mode selection and feedback policies to improve the sum rate and outage performance of downlink RBF system based on two approaches: distributed and centralized. Simulation results show that the centralized mode selection scheme with reasonable feedback amount provides waterfilling effect as well as the multiuser diversity gain, leading to the performance improvement of RBF in terms of sum rate and outage probability.
Keywords :
MIMO communication; array signal processing; diversity reception; error statistics; feedback; radio links; BER; feedback policy; multimode random beamforming; multimode transmission; multiuser diversity gain; multiuser downlink MIMO system; waterfilling effect; Array signal processing; Bit error rate; Capacity planning; Diversity methods; Downlink; Feedback; MIMO; Research and development; Scheduling; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-1644-8
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2008.182
