Optimizing power consumption in distributed antenna systems with large-scale CSIT

The power consumption in distributed antenna systems (DAS) is reduced for green mobile communications by optimizing the total power consumption in downlink DAS with only large-scale channel state information at the transmitter (CSIT) using a practical power consumption model including both the transmission power and the circuit power. The scheme combines transmit antenna selection and power allocation, decomposes the original problem into a series of sub-problems, each of which can be solved by efficient algorithms. The result is a low-complexity joint ordering selection and power allocation algorithm. Simulations show that the total power consumption is reduced considerably by this algorithm while satisfying the ergodic capacity requirements of the users. Thus, this scheme provides practical performance enhancement for DAS with low system overhead.