Title :
Performance Optimization of MIMO Y Channels: Interference Alignment and Signal Detection
Author :
Teav, Keov Kolyan ; Zhendong Zhou ; Vucetic, Branka
Author_Institution :
Univ. of Sydney, Sydney, NSW, Australia
Abstract :
In this letter, we propose a combined scheme of interference alignment and signal detection to optimize the performance of a multiple-input multiple-output (MIMO) Y channel, which consists of three users and a middle relay equipped with nU and nR antennas, respectively. First, an iterative interference alignment algorithm is introduced to optimize both beamforming and combining vectors by minimizing the spillage of the interference signals, and ensuring that the desired signals fall into the orthogonal complement of the interference subspace. Then, a signal detection scheme, which employs feed-forward and feedback filters, is applied at the relay to further deal with system interferences. Simulation results show that the proposed combined scheme for MIMO Y channels produces a significant improvement over the existing schemes.
Keywords :
MIMO communication; interference (signal); relay networks (telecommunication); signal detection; MIMO Y channels; feedback filters; feedforward filters; interference alignment; interference signals; iterative interference alignment algorithm; middle relay; orthogonal complement; performance optimization; signal detection; Array signal processing; Interference; MIMO; Optimization; Relays; Signal detection; Vectors; Interference alignment; MIMO Y; signal detection;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2013.112513.132009