Title :
Performance Analysis of Orthogonal Beamforming with User Selection in MIMO Broadcast Channels
Author :
Ozyurt, Serdar ; Torlak, Murat
Author_Institution :
Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA
Abstract :
This work considers the problem of multiuser transmission in a downlink transmission system where a transmitter with multiantenna elements sends information to a set of scheduled users with each having a single antenna. We investigate the sum rate performance of an orthogonal beamforming (OBF) scheme called adaptive OBF, which is a suboptimal low-complexity alternative to the capacity-achieving dirty paper coding approach. We develop a simple order statistics framework to evaluate the probability density functions (pdfs) of the scheduled users´ signal-to-interference plus noise ratio (SINR) values based on the knowledge of channel statistics and selection procedure. In particular, the pdf expressions for first and second scheduled users´ SINR values are obtained in closed-form. The analysis is verified by numerical results.
Keywords :
MIMO communication; array signal processing; broadcast channels; channel coding; communication complexity; probability; radio links; MIMO broadcast channel; SINR value; adaptive OBF; capacity-achieving dirty paper coding approach; channel statistics knowledge; downlink transmission system; multiantenna element; multiuser transmission; orthogonal beamforming; pdf expression; probability density function; signal-to-interference plus noise ratio value; single antenna; suboptimal low-complexity; sum rate performance; user selection; Algorithm design and analysis; Array signal processing; Complexity theory; Interference; Joints; Signal to noise ratio; Vectors;
Conference_Titel :
Global Telecommunications Conference (GLOBECOM 2011), 2011 IEEE
Conference_Location :
Houston, TX, USA
Print_ISBN :
978-1-4244-9266-4
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2011.6134238
