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This paper studies power allocation in Coordinated Multi-Point (CoMP) transmission of 3GPP LTE-Advanced system with Remote Radio Units (RRUs) power constraints. The authors apply Block Diagonal (BD) precoding to downlink transmission, and assume perfect knowledge of downlink channels and transmit messages at each transmit point. They 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.
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