Energy Efficient Power Allocation for Multicell Distributed Antenna Systems

In this letter, we address the problem of energy efficient coordinated power allocation in a multicell distributed antenna system (DAS). Due to the mutual coupling of multiple cells caused by intercell interference (ICI), the problem is nonconvex and, therefore, is difficult to solve. We assume that only the large-scale channel state information at the transmitter (CSIT) is known to reduce the system cost. Using successive Taylor expansion, we formulate the problem as a series of quasi-concave fractional programming subproblems. These subproblems are further solved using an iterative power allocation algorithm. The proposed solution is superior to existing methods, as verified by simulation results.