Degrees of freedom of relay aided MIMO X network with orthogonal components
Wireless Personal Multimedia Communications(2011)
Abstract
We consider the one-way relay aided MIMO X fading Channel where there are two transmitters and two receivers along with a relay with M antennas at every node. Every transmitter wants to transmit messages to every other receiver. The relay broadcasts to the receivers along a noisy link which is independent of the transmitters channel. In literature, this is referred to as a relay with orthogonal components. We derive an upper bound on the degrees of freedom of such a network. Next we show that the upper bound is tight by proposing an achievability scheme based on signal space alignment for the same for M = 2 antennas at every node.
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Key words
MIMO communication,antennas,fading channels,radio receivers,radio transmitters,telecommunication links,MIMO,antennas,degrees of freedom,fading Channel,orthogonal components,receivers,relay broadcasts,transmitters
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