Multi-User Cooperative Base Station Systems With Joint Precoding and Beamforming

摘要: Interference among multiple base stations that coexist in the same location limits capacity of wireless networks. In this paper, we propose a method to design single/multi-stream multi-user multiple-input multiple-output (MIMO) cooperative downlink transmission scheme employing precoding and beamforming under both per station (BS) total BS power constraints. The constraints are where for each all BSs is limited particular value, respectively. algorithm eliminates interference achieves symbol-error rate (SER) fairness different users. To eliminate interference, Tomlinson-Harashima (THP) used cancel part while transmit-receive antenna weights remaining part. An iterative based on uplink-downlink duality principle generate weights. provides an equal signal-to-interference-plus-noise-ratio (SINR) across users reduces its computational complexity by trading off slight performance degradation. proposed methods extended scenario when receiver does not have complete channel state informations (CSIs). Lastly, new selecting user order, which has much lower than VBLAST ordering but with almost performance. simulation results show schemes considerably outperform existing nonlinear linear terms SER approach free