Random antenna selection to mitigate the interferences from closely located users

Abstract

Since millimeter (mm)-wave suffer significant path loss than microwave, beamforming which can obtain array gain is required. In this thesis, we consider analog beamforming with phase shifter supporting multiuser. Also, one phase shifter at each antenna is constraint in our system to reduce the hardware complexity. In multiuser analog beamforming system, management of interference from closely located users is important because interference from farther located users can be suppressed by using of beamforming. We propose beamforming with random antenna selection to mitigate interference from nearby users. Also, low rate spread code is adopted for reliable communication in case of main beams overlapping. In this thesis, we compare fixed and random antenna selections and analyze the interference and bit error rate (BER) with respects to user`s positions. Simulation and analysis indicate that beamforming with random antenna selections is advantageous when mitigating interference from closely located users.