Joint Power Allocation for OFDM System With Cooperation at the Transmitters

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It is known that traditional Water-Filling (WF) provides a closed form solution for capacity maximization in Orthogonal Frequency Division Multiplex (OFDM) system. The solution is derived from a maximum mutual information argument with a single transmitter. Motivated by the novel technology of cooperative communication, the authors consider a new power allocation problem for OFDM systems with two cooperative transmitters, where each transmitter has an individual power constraint and can obtain their own perfect Channel State Information (CSI).