Massive MIMO and dense base station (BS) deployment are promising technologies to achieve large system capacity that is one requirement for 5G mobile communications systems. To mitigate inter-BS interference which is increased by dense BS deployment, coordinated beamforming (CB) has been studied. A low complexity CB scheme is preferable especially for massive MIMO system because the complexity of beamforming weight calculation depends on the number of antennas. ZF and MMSE based CB schemes have been investigated as the low complexity scheme, while the throughput performances of these schemes for massive MIMO system have not been compared. In this paper, we evaluate the throughput performances of ZF and MMSE based CB schemes while changing the number of spatially multiplexed users and interference suppressed users. Simulation results show that MMSE based scheme achieves about 6% higher throughput performance than ZF based scheme without the appropriate selection of interference suppressed users and is suitable for massive MIMO system.
Performance Analysis of Low Complexity Coordinated Beamforming for Massive MIMO System
2017-09-01
387096 byte
Conference paper
Electronic Resource
English