Opportunistic user scheduling and antenna selection in the downlink of multiuser MISO systems

We consider the downlink of multiuser multiple-input single-output (MISO) wireless systems, where the base station is equipped with multiple antennas and each mobile user is constrained to a single antenna. In particular, we consider linear preceded systems such that the single antenna receivers do not have to estimate the channel, but only scale and quantize the received data. In this scenario, we propose low complexity opportunistic user scheduling and antenna selection algorithms. The highly complex optimal scheduling and antenna selection algorithms are first derived, and then, low complexity greedy optimization algorithms are proposed. It is shown that the proposed algorithms obtain near optimal performance.