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We present a distributed Coordination Area (CA) formation method for defining cooperating cells for Coordinated Multi-Point (CoMP) transmissions. We divide the available system resources into multiple resource shifts and assume independent CA realizations on different resource shifts. The ulti-shift CA formation method is self-organized based on the interference situations and the traffic profile...
Rank-constrained optimization problems have received an increasing intensity of interest recently, because many optimization problems in communications and signal processing applications can be cast into a rank-constrained optimization problem. However, due to the nonconvex nature of rank constraints, a systematic solution to general rank-constrained problems has remained open for a long time. In...
In this paper, we focus on a rank constrained optimization problem with general Schur-convex/concave objective function and multiple trace/log-determinant constraints. We first derive a structural result on the optimal solution of the rank constrained problem without relaxation using majorization theory. Based on the solution structure, we transform the rank constrained problem into an equivalent...
Multi-input multi-output (MIMO) cognitive radio (CR) network is an emerging technology which is expected to be a potential solution to enhance the utilization efficiency of the radio spectrum. CR network supports opportunistic spectrum sharing by allowing the secondary users to share the same radio spectrum occupied by the primary users. However, the spectrum sharing by the secondary users should...
We consider distributed Inter-Cell Interference Coordination based on rate splitting and interference cancellation. Link adaptation is performed based on Channel Quality Information both on the desired link and on links towards interference victims. A transmitted message is split into a private and a public part. The private part is decodable only by the intended receiver, whereas the public part...
Device-to-Device communication underlaying a cellular network enables local services with limited interference to the cellular network. In this paper we study the optimal selection of possible resource sharing modes with the cellular network in a single cell. Based on the learning from the single cell studies we propose a mode selection procedure for a multi-cell environment. Our evaluation results...
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