Adaptive resource allocation scheme for 2-hop non-regenerative MIMO relaying system

Resource allocation schemes for traditional MIMO system have been widely studied. However, when the MIMO technique is applied to relaying systems, where several separated terminals form a virtual receive array (VAA) and relay the signal from the transmitter to the receiver, these issues, which have a close relationship with the system performance, should be solved before a MIMO relaying system is deployed on a large scale. The channel capacity for a 2-hop MIMO relaying system is derived from the perspective of information theory. An optimal resource allocation under an aggregate power constraint between relaying nodes is proposed in closed form for the case with two relaying nodes. Numerical results indicate that a MIMO relaying system can achieve a higher channel capacity than traditional MIMO does and that the positions of the relaying nodes affect the system performance directly.