Title :
Sum-Rate Improved Interference Alignment for the M x 2 MIMO X Channel
Author :
Kwon, Younggap ; Hwang, Taewon
Author_Institution :
Sch. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea
fDate :
7/1/2012 12:00:00 AM
Abstract :
In this letter, we propose an improved interference alignment (IA) scheme for the M × 2 constant multiple-input multiple-output (MIMO) X channel composed of M transmitters and two receivers with multiple antennas each. The proposed IA scheme enhances the sum rate as well as achieving the DOF outerbound. To enhance the sum rate, the proposed scheme designs the transmit beamformers that make the desired signal space and the interference space as close to orthogonal as possible. Simulation results show that the proposed IA scheme achieves similar sum rate as the random search scheme but with less computational complexity.
Keywords :
MIMO communication; antenna arrays; array signal processing; computational complexity; radio receivers; radio transmitters; radiofrequency interference; search problems; wireless channels; DOF outerbound; M transmitters; MIMO channel; computational complexity; constant multiple-input multiple-output channel; improved IA scheme; interference space; radio receiver; random search scheme; signal space; sum-rate improved interference alignment; transmit beamformers; Array signal processing; Interference; MIMO; Receivers; Signal to noise ratio; Transmitters; Vectors; Interference alignment (IA); X channel; multiple-input multiple-output (MIMO); sum rate;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2012.050912.120706
