摘要
5G通信系统通过共享WiFi频谱可以提高系统容量和吞吐量,但对WiFi传输性能造成了一定影响。为了进一步提高系统性能,针对非授权频段的大规模多输入多输出(Massive Multiple-Input Multiple-Output Unlicensed,mMIMO-U)系统设计了一种WiFi/5G共存的混合预编码方案。通过构建WiFi和5G用户的小区蜂窝模型,采用空间资源分配和空域波束赋形使得信号在指定的方向上得到增强,在非期望方向上信号强度降低,并采用块对角化和最小均方误差(Minimum Mean Squared Error,MMSE)信号检测技术有效地处理了用户以及环境噪声之间的干扰进而改善信道增益。仿真结果表明,该方案有效降低了WiFi/5G设备之间的干扰和算法复杂度,提高了5G设备在信道中的传输速率,使WiFi/5G能在非授权频段共存。
The 5G communication system can improve system capacity and throughput by sharing WiFi spectrum,but it has a certain impact on WiFi transmission performance.In order to further improve the system performance,a hybrid precoding scheme with WiFi/5G coexistence is designed for unlicensed massive multiple-input multiple-output(MIMO)systems.By constructing the cellular model of WiFi and 5G users,the spatial resource allocation and spatial beamforming are used to enhance the signal in the specified direction and reduce the signal strength in the unexpected direction.Block diagonalization and minimum mean squared error(MMSE)signal detection techniques are used to effectively deal with the interference between users and environmental noise to improve the channel gain.Simulation results show that the proposed scheme effectively reduces the interference and algorithm complexity between WiFi/5G devices,improves the transmission rate of 5G devices in the channel,and enables WiFi/5G to coexist in unauthorized frequency bands.
作者
高俊
张治中
邓炳光
GAO Jun;ZHANG Zhizhong;DENG Bingguang(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China)
出处
《电讯技术》
北大核心
2021年第12期1573-1578,共6页
Telecommunication Engineering
基金
重庆市技术创新与应用发展专项重大主题专项项目(cstc2019jscx-zdztzxX0002)。
