Transmission strategies in multi-user millimeter wave systems

Transmission strategies for millimeter wave systems have become a promising strategy to achieve a higher quality of service in the network. Those strategies stem out from various network optimization criterion retaining a harmony between the quality of service and energy incurred to the system. In this paper, we address two such network optimization strategies, namely - transmit power minimization and sum-rate maximization. We offer a simple and comprehensive solution to the minimum transmit power and maximum sum-rate precoding vectors via the design of hybrid analog and digital precoders. The crux in the simplicity of the proposed algorithm lies in the fact that the digital precoders are designed by employing zero-forcing based design and the analog part could be portrayed as maximization of Rayleigh quotient. The numerical results illustrate comparable performance gain over the computationally expensive fully digital and unconstrained precoding solutions.