DocumentCode :
3425178
Title :
Capacity and downlink transmission algorithms for a multi-user MIMO channel
Author :
Spencer, Quentin H. ; Haardt, Martin
Author_Institution :
Dept. of Electr. & Comput. Eng., Brigham Young Univ., Provo, UT, USA
Volume :
2
fYear :
2002
fDate :
3-6 Nov. 2002
Firstpage :
1384
Abstract :
Downlink beamforming in a multi-user MIMO channel can provide significant gain in system throughput by allowing space division multiple access (SDMA). The exact solution for the sum capacity of such channels does not exist in closed form, but requires an expensive iterative algorithm. By imposing certain constraints on the capacity equation, a sub-optimal closed-form solution can be obtained. The paper presents two such solutions. The first, referred to as "block-diagonalization" arises from forcing all inter-user interference to zero. The second - "successive optimization" - is an alternative method of minimizing transmit power for an arbitrary information rate per user, and allows solutions which, under certain circumstances, are superior to the block-diagonalization approach. Both algorithms have sub-optimal performance, but they lead to simpler transmitter and receiver structures, and allow a tradeoff between performance and complexity.
Keywords :
channel capacity; cochannel interference; minimisation; mobile radio; multiuser channels; radio receivers; radio transmitters; space division multiple access; SDMA; block-diagonalization; capacity equation; channel capacity; cochannel interference; downlink transmission algorithms; inter-user interference; iterative algorithm; mobile users; multiuser MIMO channel; receiver structures; space division multiple access; sub-optimal closed-form solution; successive optimization; transmit power minimization; transmitter structures; Array signal processing; Channel capacity; Closed-form solution; Downlink; Equations; Interference constraints; Iterative algorithms; MIMO; Multiaccess communication; Throughput;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signals, Systems and Computers, 2002. Conference Record of the Thirty-Sixth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
ISSN :
1058-6393
Print_ISBN :
0-7803-7576-9
Type :
conf
DOI :
10.1109/ACSSC.2002.1197006
Filename :
1197006
Link To Document :
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