Adaptive Opportunistic Transmission in MU-MIMO Downlink With Reduced Feedback
In this paper the authors proposed two threshold-aided adaptive opportunistic transmission strategies in MUltiuser Multiple-Input Multiple-Output (MU-MIMO) downlink with limited feedback. Threshold scheme in company with transmission mode adaptation are employed to handle feedback cost and improve system performance. In one time slot, each Mobile Station (MS) carries out channel estimation, selects appropriate transmission mode and feeds back adaptively. With feedback information the Base Station (BS) schedules one user out of candidate MSs and transmits to it. One of the proposed strategies employs single-level threshold.