Title :
Sum-rate optimal multi-antenna downlink beamforming strategy based on clique search
Author :
Yoo, Taesang ; Goldsmith, Andrea
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., CA, USA
fDate :
28 Nov.-2 Dec. 2005
Abstract :
We consider a multi-user MIMO downlink system employing zero-forcing beamforming (ZFBF) as a spatial multiplexing strategy, and propose low-complexity user subset selection methods based on a clique (fully connected subgraph) search. The proposed algorithms, maximum weighted clique (MWC)-ZFBF and greedy weighted clique (GWC)-ZFBF, are shown to achieve the asymptotic sum-capacity of MIMO downlink channels as the number of users goes to infinity. Thus, clique search based ZFBF is an appealing strategy in MIMO downlink systems with a large number of users.
Keywords :
MIMO systems; antenna arrays; greedy algorithms; multiplexing; radio networks; set theory; MIMO downlink channels; asymptotic sum-capacity; clique search; greedy weighted clique; maximum weighted clique; multiuser MIMO downlink system; optimal multiantenna downlink beamforming strategy; spatial multiplexing strategy; user subset selection methods; zero-forcing beamforming; Array signal processing; Broadcasting; Costs; Decoding; Downlink; H infinity control; MIMO; Mobile antennas; Receiving antennas; Transmitting antennas;
Conference_Titel :
Global Telecommunications Conference, 2005. GLOBECOM '05. IEEE
Print_ISBN :
0-7803-9414-3
DOI :
10.1109/GLOCOM.2005.1577903
