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在使用波束成型传输数据的蜂窝系统中,为提高下行链路的频谱效率,需要多小区多用户之间协作地产生波束.以多小区多用户下行链路的数学模型为基础,计算了各用户波束发送滤波器、接收滤波器、发送功率三类变量的梯度,使这些变量不断沿梯度方向调整并投影至可行空间,从而提出了一种基于梯度投影的多小区多用户下行协作波束成型传输方案,并分析了该方案需要在相邻小区基站间交互的信息.仿真结果表明,该方案在典型场景与参数配置下可达到约5 bit/(s·Hz·cell)的平均频谱效率性能.因此,多小区多用户之间的有效协作有助于提高蜂窝系统频谱效率性能.
In a cellular system that uses beamforming to transmit data, a multi-cell multi-user cooperative beamforming is required to improve spectral efficiency of the downlink.According to a multi-cell multi-user downlink mathematical model, each user Beam transmit filter, receive filter and transmit power, so that these variables are continuously adjusted in the gradient direction and projected to the feasible space, so a multi-cell multi-user downlink cooperative beamforming transmission scheme based on gradient projection is proposed , And analyzes the information that this scheme needs to exchange between base stations of neighboring cells.The simulation results show that this scheme can achieve the average spectral efficiency of about 5 bit / (s · Hz · cell) under the typical scenario and parameter configuration. , Multi-cell multi-user collaboration between the effective help improve the efficiency of the cellular system spectrum performance.