Efficiency of Transmission Techniques in Multiple-Input Single-Output (MISO) Communication System

This paper examines methods of increasing the downlink channel capacity based on transmitting a signal through a multiple antenna system such as beamforming (BF), transmit diversity (TD) and the combined approach integrating BF and TD. A convenient criterion of efficiency of these techniques is proposed, which reflects the capacity improvement. It is shown that the efficiency of using the multiple transmit antenna system depends on two factors - improvement of the reception performance and mitigation of the intra-system interference. The paper provides the comparative assessment of the methods being researched in terms of their efficiency.