Joint Antenna Selection and Beamforming Algorithms for Physical Layer Multicasting with Massive Antennas
We investigate the problem of minimizing the total power consumption under the constraint of the signal to noise ratio (SNR) requirement for the physical layer multicasting system with large scale antenna arrays. In contrast with existing work, we explicitly consider both the transmit power and the circuit power scaling with the number of antennas. The joint antenna selection and beamforming technique is proposed to minimize the total power consumption. The problem is a challenging one, which aims to minimize the linear combination of l 0 norm and l 2 norm. To our best knowledge, this minimization problem has not yet been well solved. A random decremental antenna selection algorithm is designed, which is further modified by an approximation of the minimal transmit power based on the asymptotic orthogonality of the channels. Then, a more efficient decremental antenna selection algorithm is proposed based on minimizing the l 0 norm. Performance results show that the l 0 norm minimization algorithm greatly outperforms the random selection algorithm in terms of the total power consumption and the average run time.
Algorithms