Block Diagonal Precoding Based Power Allocation for Coordinated Multi-Point Transmission

Abstract

This paper studies power allocation in coordinated multi-point (CoMP) transmission of 3GPP LTE-Advanced system with remote radio units(RRUs) power constraints. We apply block diagonal (BD) precoding to downlink transmission, and assume perfect knowledge of downlink channels and transmit messages at each transmit point. We propose a modified water-filling power (MWF) allocation algorithm in order to maximize the downlink sum capacity, at the same time the low complexity is achieved. The interior-point method is also used to solve the optimization problem. Simulations show that interior-point method converges after only a few iterative steps and the system capacity is near-optimal. As for complexity and power efficiency, MWF achieves a good compromise

System-level performance of LTE-Advanced with joint transmission and dynamic point selection schemes

“…For DPS and CS/CB, the MU scenario has similar issues as for single-cell transmission. For JT CoMP, there is an additional power allocation problem if the zero forcing beamforming is used [27]. In this article, we consider SU single-cell MIMO operation as the baseline against which the SU CoMP methods are compared in terms of network performance.…”