Analog Antenna Combining in Multiuser OFDM Systems: Beamforming Design and Power Allocation
This paper consists in characterizing the capacity region of a broadcast system based on analog antenna combining and Orthogonal Frequency Division Multiplexing (OFDM). In particular, the authors consider the maximization of a weighted sum of the rates, which results in a highly non-convex optimization problem. The proposed iterative approach is based on the alternative optimization of the beam-formers, and the power and subcarrier allocation. Finally, their experiments show that in most practical situations, the complexity of the optimal approaches (subcarrier sharing and power allocation) is not justified by the marginal gains in the capacity region.