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Green resource allocation in an amplify-and-forward (AF) relay-assisted MIMO system is considered, consisting of one source, one AF relay, and one destination, in which the relay-to-destination channel is only statistically known to the source and relay. The source covariance matrix and the relay AF matrix are optimized so as to maximize the system energy efficiency (EE), defined as the ratio of the...
The issue of energy-efficient resource allocation in a single-user relay-assisted MIMO system is considered. For this scenario, a great deal of research has focused on rate maximization or sum power minimization, whereas much fewer results are available when bits/Joule energy efficiency optimization is the goal. Here, the performance metric to optimize is the ratio between the system's achievable...
In this work, we analyze opportunistic beamforming with finite number of single-antenna users under the constraint that the feedback overhead from the mobiles to the base is constant. First, we characterize the impact of the fading variances of the users and the spatial correlation on the sum rate of TDMA based opportunistic beamforming using majorization theory. Further, we describe quantitatively...
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