Dynamic bit allocation and differential quantization in feedback link for robust power allocation in multiuser opportunistic beamforming

摘要: Multi-antenna systems provide advantages in terms of link quality and multiuser access capabilities, which can be achieved by using schemes as multibeam opportunistic beamforming. This scheme only requires partial channel state information at the transmitter (CSIT) equivalent moduli. paper deals with problem feeding back CSI from multiple receivers to base station (BS) through limited capacity feedback links. involves a quantization delay that produces errors CSIT. In this sense, proposed is based on robust design takes into account these errors. Additionally, dynamic bit allocation among users derived, combined differential minimize transmit power. It considers both userspsila sensitivities Doppler frequencies due mobility. Simulation results show benefits such schemes.