Performance of a leakage-based precoded downlink multi-user MIMO scheme using measured channels

A novel low complexity multi-user MIMO downlink architecture has recently been proposed in literature. While this system seeks to palliate the limitation, imposed by some linear precoders in the absence of scheduling, that the total number of users´ antennas be less than the number of base-station antennas, the system does not entirely null-out multi-user interference. The system was originally designed using complex Gaussian distributed random channel matrices as a model for the wireless channels and, as a result of this, a more experimentally focused assessment of system performance is offered in this work. It is shown that relative channel energy differences can characterise the BER performance and the eigenvalue response of the system model at low SNR. The effect of high SNR on the eigenvalue response of both measured and randomly generated channels is also highlighted.