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Proposed is a greedy algorithm based power control technique to improve the minimum square Euclidean distance (MSED), which is directly related to the error performance of MIMO systems employing maximum-likelihood receivers. The basic idea is to allocate an evenly divided portion of power to the transmit antenna which will give the maximum system MSED during each iteration. In that case, the system MSED can be increased to the greatest extent by the allocation of all available power. Simulations show that it achieves the optimal performance for the two-stream case, and has attractive performance advantages over the equal power transmission for MIMO systems with a larger number of transmit antennas.