An improved transmission strategy for multiple antenna channels with partial feedback

We investigate transmission strategies for multiple antenna systems with partial spatial information of channel available at the transmitter. A new beamforming method is proposed in which the beamforming matrix is determined from the partial spatial information in a novel but predefined way; as a result, the receiver also knows the beamforming matrix. With this beamforming scheme, we develop a multiple antenna system concept that enables better use of the multiple-input-multiple-output (MIMO) channels from a channel capacity perspective. The results show that the proposed methods lead to systems wherein the amount of channel feedback information can be significantly reduced with a minor sacrifice of achievable transmission rate.