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

Volume

16

Issue

7

fYear

2012

fDate

7/1/2012 12:00:00 AM

Firstpage

1088

Lastpage

1091

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;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2012.050912.120706

Filename

6200379