大规模MIMO系统中基于3D码本的多用户预编码方案
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摘要
针对大规模多输入多输出(MIMO)系统存在的共信道干扰问题,提出一种基于3D码本的多用户预编码方案。以均匀平面阵列天线为基础,利用垂直下倾角的分布特点设计垂直码本,并将现有的离散傅里叶变换码本作为水平码本,基于Kronecker积运算重新构造3D码本。结合码字选择和用户调度策略,最小化大规模MIMO系统中多用户的干扰。仿真结果表明,与基于3D离散傅里叶变换码本的预编码方案相比,该方案能准确区分用户在垂直维信道信息上的差异,有效抑制多用户干扰,提升系统速率。
For the co-channel interference in large-scale Multiple Input Multiple Output(MIMO) systems,this paper proposes a multiuser precoding scheme based on 3D codebooks.On the basis of uniform planar array antennas,the vertical codebook is designed by the distribution characteristics of vertical declivitous angle,and the existing Discrete Fourier Transform(DFT) codebook is used as the horizontal codebook.3D codebooks based on the Kronecker product operation are reconstructed.Codeword selection and user scheduling strategy are combined to minimize the multiuser interference in the large-scale MIMO system.Simulation results show that,compared with the 3D-DFT codebook precoding scheme,the proposed scheme can more accurately distinguish the differences of the vertical channel information,and hence effectively suppress multiuser interference and improve system rate significantly.
For the co-channel interference in large-scale Multiple Input Multiple Output(MIMO) systems,this paper proposes a multiuser precoding scheme based on 3D codebooks.On the basis of uniform planar array antennas,the vertical codebook is designed by the distribution characteristics of vertical declivitous angle,and the existing Discrete Fourier Transform(DFT) codebook is used as the horizontal codebook.3D codebooks based on the Kronecker product operation are reconstructed.Codeword selection and user scheduling strategy are combined to minimize the multiuser interference in the large-scale MIMO system.Simulation results show that,compared with the 3D-DFT codebook precoding scheme,the proposed scheme can more accurately distinguish the differences of the vertical channel information,and hence effectively suppress multiuser interference and improve system rate significantly.
引文
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[2]Gesbert D.Kountouris M,Heath R W,et al.Shifting the MIMO Paradigm:From Single User to Multiuser Communications[J].IEEE Signal Processing Magazine,2007,24(5):36-46.
[3]邱玲,许杰,刘蓓,等.多用户、多小区MIMO通信技术[M].北京:人民邮电出版社,2011.
[4]Ngo H Q,Marzetta T L.Larsson E G.Analysis of the Pilot Contamination Effect in Very Large Multicell Multiuser MIMO Systems for Physical Channel Models[C]//Proceedings of IEEE International Conference on Acoustics,Speech and Signal Processing.Washington D.C.,USA:IEEE Press,2011:3464-3467.
[5]Lu X.Tolli A.Piirainen 0,et al.Comparison of Antenna Arrays in a 3-D Multiuser Multicell Network[C]//Proceedings of 2011 IEEE International Conference on Communications.Washington D.C.,USA:IEEE Press,2011:l-6.
[6]Ng B L,Kim Y,Lee J,et al.Fulfilling the Promise of Massive MIMO with 2D Active Antenna Array[C]//Proceedings of Globecom Workshops.Washington D.C.,USA:IEEE Press,2012:691-696.
[7]王月瑜,郭黎利.三维接收天线阵列信道模型下的空域相关性[J].计算机工程,2008,34(12):9-12.
[8]刘燕莉,景小荣,于秀兰,等.基于Matlab的3D MIMO信道空间相关性仿真[J].计算机仿真,2013,30(12):187-190.
[9]Ying D,Vook F W,Thomas T A,et al.Kronecker Product Correlation Model and Limited Feedback Codebook Design in a 3D Channel Model[C]//Proceedings of 2014 IEEE International Conference on Communications.Washington D.C.,USA:IEEE Press,2014:5865-5870.
[10]Su Xin,Zeng Jie,Li Jingyu,et al.Limited Feedback Precoding for Massive MIMO[J].International Journal of Antennas&Propagation,2013,2013(1/2):1212-1215.
[11]Halbauer H,Saur S,Koppenborg J,et al.3D Beamforming:Performance Improvement for Cellular Networks[J].Bell Labs Technical Journal,2013,18(2):37-56.
[12]张小飞,汪飞,徐大专.阵列信号处理的理论和应用[M].北京:国防工业出版社,2010.
[13]Akoum S.Acharya J.Vertical Beamforming for Threedimensional User Placement[C]//Proceedings of 2015International Conference on Computing,Networking and Communications.Washington D.C.,USA:IEEE Press,2015:336-340.
[14]Samsung.Downlink MIMO for EUTRA:3GPP TGX RAN WG1,Rl-060335[R].Seoul,Korea:Samsung,2005:7-11.
[15]Love D J,Heath R W.Limited Feedback Unitary Precoding for Spatial Multiplexing Systems[J].IEEE Transactions on Information Theory,2005,51(8):2967-2976.