Worst-case performance optimization for robust power control in downlink beamforming

In this paper,11Part of the algorithm in this paper has been presented in IEEE ISIT’2008 [1]. we examine the problem of robust power control in a downlink beamforming environment under uncertain channel state information (CSI). We suggest that the method of power control using the lower bounds of signal-to-interference-and-noise ratio (SINR) is too pessimistic and will require significantly higher power in transmission than is necessary in …