Optimal Power Allocation for Linear Dispersion Codes Over Correlated MIMO Channels with Channel State Feedback

— The design of spatio-temporal power allocation schemes is considered for space-time coding over spatially correlated multiple-input multiple-output (MIMO) channels. The focus is on linear dispersion (LD) space-time codes that are constructed to maximize the mutual information between the input of the space-time encoder and the output of the channel. It is assumed that perfect channel state information (CSI) is available at the receiver. As for the CSI at the transmitter, three cases are considered: 1) perfect CSI is available, 2) only statistical information (that is, no CSI) is available, and 3) partial CSI in the form of a B-bit quantized channel information along with the statistical information is available. In all the three cases, it is shown that the optimal temporal power allocation is uniform. The optimal spatial power allocation for the case where no CSI is available was studied previously in [1] where it was shown to be a nontrivial function of the spatial correlation. He...

• Type: Conference
• Year: 2007
• Where: GLOBECOM
• Authors: Che Lin, Vasanthan Raghavan, Venugopal V. Veeravalli
• Keywords: GLOBECOM 2007, Partial Csi, Power Allocation, Spatial Power Allocation, Telecommunications