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Many MIMO capacity analyses and precoding algorithms are obtained based on the assumption of total power constraint while assuming power can be allocated freely across antennas. In practical MIMO systems, however, per antenna power constraints are often more predominant design consideration than the total power constraints. In this paper, the authors study the transmission schemes for MIMO systems with per-antenna power constraints. They derive the necessary and sufficient conditions for the optimal transmission scheme. They also develop an iterative algorithm and prove its convergence to the optimal solution.
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