异构云无线接入网络中的波束成形算法

doi:10.11959/j.issn.1000-436x.2019170

通信学报 ›› 2019, Vol. 40 ›› Issue (8): 45-53.doi: 10.11959/j.issn.1000-436x.2019170

异构云无线接入网络中的波束成形算法

左加阔^1,²,杨龙祥²,鲍楠¹

¹ 南京邮电大学物联网学院，江苏南京 210023
² 南京邮电大学通信与信息工程学院，江苏南京 210023

修回日期:2019-07-01 出版日期:2019-08-25 发布日期:2019-08-30
作者简介:左加阔（1985- ），男，山东枣庄人，博士，南京邮电大学讲师，主要研究方向为云无线接入网络资源管理、无线通信网络能效优化等。|杨龙祥（1966- ），男，江苏盐城人，博士，南京邮电大学教授、博士生导师，主要研究方向为网络编码与协调通信、泛在网络与物联网技术、移动通信系统设计与优化等。|鲍楠（1985- ），女，江苏镇江人，博士，南京邮电大学讲师，主要研究方向为异构网络资源优化和干扰抑制等。
基金资助:
国家自然科学基金资助项目(61801237);国家自然科学基金资助项目(61701255);江苏省博士后基金资助项目(SBH17024);江苏省高校自然科学基金资助项目(15KJB510026);江苏省自然科学基金资助项目(BK20150866);南京邮电大学引进人才基金资助项目(NY215046);南京邮电大学引进人才基金资助项目(NY217056)

Beamforming for heterogeneous cloud radio access network

Jiakuo ZUO^1,²,Longxiang YANG²,Nan BAO¹

¹ College of Internet of Things,Nanjing University of Posts and Telecommunications,Nanjing 210023,China
² College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China

Revised:2019-07-01 Online:2019-08-25 Published:2019-08-30
Supported by:
The National Natural Science Fundation of China(61801237);The National Natural Science Fundation of China(61701255);Postdoctoral Fund of Jiangsu Province(SBH17024);Jiangsu University of Natural Science Foundation(15KJB510026);The Natural Science Foundation of Jiangsu Province(BK20150866);Introduction of Talent Fund of Nanjing University of Posts and Telecommunications(NY215046);Introduction of Talent Fund of Nanjing University of Posts and Telecommunications(NY217056)

摘要/Abstract

摘要：

针对现有异构云无线接入网络的研究主要集中在单个蜂窝网络场景，仅考虑了蜂窝网络内部干扰，忽略了蜂窝网络间干扰的问题，研究了多个蜂窝网络共存场景下的H-CRAN，通过最大化系统总传输速率，对宏基站和无线远端射频单元的波束成形向量进行联合优化。基于交替优化算法和拉格朗日对偶方法，提出了一种 MBS和RRH波束成形向量联合优化算法。首先将原优化问题分解为2个子优化问题，然后通过迭代的求解这2个子优化问题得到原优化问题的最终解。另外，根据拉格朗日对偶方法推导出了MBS和RRH波束成形向量的闭式表达式。在仿真实验中，将所提算法与其他波束成形算法进行了比较，实验结果证明，所提算法能够较好地改善系统传输速率。

关键词: 异构云无线接入网络, 波束成形, 交替优化, 多天线技术

Abstract:

To overcome the problem that previous researches for heterogeneous cloud radio access network (H-CRAN) mainly focus on single macro cell,and only considered the intracell interference in the one macro cell,while the inter cell interferences among different macro cells are neglected,H-CRAN with multiple macro-cells was studied,and the objective was to maximize system sum-rate through jointly optimizing the beamforming vectors of macro base stations (MBS) and remote radio heads (RRH).Based on alternating optimization and Lagrangian dual method,a joint MBS and RRH beamforming algorithm was proposed.The original problem was first divided into two subproblems.Then,the two sub-problem were solved alternately to obtain the final solutions of the original problem.In addition,the closed expression solutions of the two sub-problem were derived based on Lagrangian dual method.The proposed algorithm was compared with some beamforming algorithms in the simulation.The experimental results demonstrate the proposed algorithm has a better performance in improving the sum-rate of H-CRAN.

Key words: heterogeneous cloud radio access network, beamforming, alternating optimization, multi-antenna technology

中图分类号:

TN92

左加阔,杨龙祥,鲍楠. 异构云无线接入网络中的波束成形算法[J]. 通信学报, 2019, 40(8): 45-53.

Jiakuo ZUO,Longxiang YANG,Nan BAO. Beamforming for heterogeneous cloud radio access network[J]. Journal on Communications, 2019, 40(8): 45-53.

图/表 6

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参考文献 6

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参数	值
蜂窝网络的个数/个	3
系统带宽/ MHz	10
每个MBS的覆盖半径/m	500
每个RRH的覆盖半径/m	50
每个蜂窝网络中 RRH、蜂窝用户、RRH用户数	3、3、4
每个蜂窝网络中MBS、RRH的天线数	5、5
MBS到蜂窝用户和RRH用户的路径损耗/dB	128.1+37.6lg d，d表示距离（单位km）
RRH到蜂窝用户和RRH用户的路径损耗/dB	140.1+36.7lg d，d表示距离（单位km）
对数正态阴影(Log-normal shadowing) 衰落/dB	-8
穿透损耗/dB	-20

异构云无线接入网络中的波束成形算法

Beamforming for heterogeneous cloud radio access network

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