Throughput-Based Switching Between Diversity and Multiplexing in MIMO Systems With Cochannel Interference

A throughput-based switching scheme that uses the evaluated throughput as the criterion for switching between diversity and (spatial) multiplexing in multiple-input-multiple-output (MIMO) systems is proposed. The proposed throughput-based switching scheme can give a larger throughput than a MIMO scheme, with either diversity or multiplexing solely being employed. The joint beamforming and power control is further proposed for the throughput-based switching scheme to increase the received signal-to-interference-plus-noise ratio (SINR). With the increase in the received SINR, the throughput for the MIMO schemes [e.g., space-time block code (STBC) and Vertical Bell Laboratories Layered Space Time (V-BLAST)] can be further improved. We also show, through several properties, that the proposed joint beamforming and power control can increase the received SINR of each receive antenna so that the average SINR can converge to the target SINR, which, in turn, implies that the throughput can converge to the throughput requirement.