DocumentCode :
2715833
Title :
Adaptive Space-Division Multiplexing for Multiuser MIMO Antenna Systems in Downlink
Author :
Wong, Kai-Kit
Author_Institution :
Centre for Commun. Syst. & Technol., Hull Univ., Kingston Upon Hull
fYear :
2005
fDate :
5-5 Oct. 2005
Firstpage :
334
Lastpage :
338
Abstract :
In a multiple-input multiple-output (MIMO) antenna system using space-division multiplexing (SDM) in downlink channels, co-channel users can be differentiated from their spatial signatures using linear signal processing at the transmitter and receivers. Much works have been done on the optimization of the multiuser MIMO antenna weights for maximizing channel utilization. In contrast to the previous works, our main objective is to address the optimization of the number of users´ activated spatial modes in minimizing the sum-power of the base station whilst performing MIMO antenna optimization and bit-power allocation of the spatial modes given the data-rate and error-rate constraints of the users. Based on the understanding that the number of activated spatial modes for a user should highly depend on the data-rate and error-rate required by the user, we devise an adaptive SDM algorithm that leads to near-optimal performance as a brute-force approach at much reduced-complexity. Simulation results demonstrate that there is a significant gap between performance with and without adaptive SDM
Keywords :
MIMO systems; antenna arrays; computational complexity; error statistics; multiuser channels; optimisation; signal processing; space division multiplexing; MIMO antenna optimization; adaptive SDM algorithm; adaptive space-division multiplexing algorithm; base station; bit-power allocation; brute-force approach; channel utilization; co-channel users; downlink channels; error-rate constraints; linear signal processing; multiple-input multiple-output antenna system; multiuser MIMO antenna systems; near-optimal performance; spatial signatures; Adaptive arrays; Base stations; Constraint optimization; Downlink; MIMO; Radio transmitters; Receiving antennas; Signal processing; Signal processing algorithms; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2005 Asia-Pacific Conference on
Conference_Location :
Perth, WA
Print_ISBN :
0-7803-9132-2
Type :
conf
DOI :
10.1109/APCC.2005.1554075
Filename :
1554075
Link To Document :
بازگشت