Title :
Alternate Transmission Relaying Based on Interference Alignment in 3-Relay Half-Duplex MIMO Systems
Author :
Park, Seong-Ho ; Park, Ki-Hong ; Ko, Young-Chai ; Alouini, Mohamed-Slim
Author_Institution :
Sch. of Electr. Eng., Korea Univ., Seoul, South Korea
fDate :
9/1/2012 12:00:00 AM
Abstract :
In a half-duplex relaying, the capacity pre-log factor 1/2 is a major drawback in spectral efficiency. This paper proposes a linear precoding/decoding scheme and an alternate relaying protocol in a dual-hop half-duplex system where three relays help the communication between the source and the destination. In our proposed scheme, we consider a phase incoherent method in relays in which the source alternately transmits message signals to the different relays. In addition, we propose a linear interference alignment scheme which can suppress the inter-relay interference resulting from the phase incoherence of relaying. Based on our analysis of degrees of freedom and our simulation results, we show that our proposed scheme achieves additional degrees of freedom compared to the conventional half-duplex relaying.
Keywords :
MIMO communication; decoding; interference suppression; linear codes; precoding; protocols; radiofrequency interference; relays; 3-relay half-duplex MIMO system; alternate relaying protocol; alternate transmission relaying; capacity pre-log factor; degrees of freedom; dual-hop half-duplex system; interrelay interference suppression; linear interference alignment scheme; linear precoding-decoding scheme; message signal transmission; phase incoherent method; spectral efficiency; Antennas; Decoding; Interference; MIMO; Relays; Signal to noise ratio; Vectors; Relay channel; alternate transmission; and phase incoherence; decode-and-forward; degrees of freedom; half-duplex; interference alignment;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
DOI :
10.1109/JSAC.2012.120908