通信学报 ›› 2021, Vol. 42 ›› Issue (2): 134-153.doi: 10.11959/j.issn.1000-436x.2021001
刘留1, 张建华2, 樊圆圆1, 于力2, 张嘉驰1
修回日期:
2020-09-20
出版日期:
2021-02-25
发布日期:
2021-02-01
作者简介:
刘留(1981- ),男,云南昆明人,博士,北京交通大学教授、博士生导师,主要研究方向为无线信道测量与建模、时变信道信号处理、5G关键技术、高铁宽带接入物理层关键技术等。基金资助:
Liu LIU1, Jianhua ZHANG2, Yuanyuan FAN1, Li YU2, Jiachi ZHANG1
Revised:
2020-09-20
Online:
2021-02-25
Published:
2021-02-01
Supported by:
摘要:
信道建模是设计无线通信系统的基础,传统的信道建模方法无法自动学习特定类型信道的规律,特别是在针对特殊应用场景,如物联网、毫米波通信、车联网等,存在一定的局限性。此外,机器学习具有有效处理大数据、创建模型的能力,基于此,探讨了机器学习如何与信道建模进行有机融合,分别从信道多径分簇、参数估计、模型的构造及信道的场景识别展开了讨论,对当前该领域的重要研究成果进行了阐述,并对未来发展提出了展望。
中图分类号:
刘留, 张建华, 樊圆圆, 于力, 张嘉驰. 机器学习在信道建模中的应用综述[J]. 通信学报, 2021, 42(2): 134-153.
Liu LIU, Jianhua ZHANG, Yuanyuan FAN, Li YU, Jiachi ZHANG. Survey of application of machine learning in wireless channel modeling[J]. Journal on Communications, 2021, 42(2): 134-153.
表1
MPC聚类算法的特点"
算法 | 应用范围 | 先验知识 | 支持动态MPC | |||
时延域 | 角度域 | 簇的数量 | 聚类中心 | |||
k-means/KPM | 是 | 是 | 需要 | 需要 | 有可能 | |
GMM | 是 | 是 | 需要 | 不需要 | 有可能 | |
DBSCAN | 是 | 是 | 不需要 | 不需要 | 不支持 | |
KPD | 是 | 是 | 不需要 | 不需要 | 有可能 | |
联合核密度 | 是 | 是 | 不需要 | 不需要 | 不支持 | |
密度峰值 | 是 | 否 | 不需要 | 不需要 | 不支持 | |
稀疏度 | 是 | 否 | 不需要 | 不需要 | 不支持 | |
模糊C均值 | 是 | 是 | 需要 | 需要 | 有可能 | |
KPM–卡尔曼滤波 | 是 | 是 | 需要 | 需要 | 支持 | |
数据流 | 是 | 是 | 仅在初始化时需要 | 仅在初始化时需要 | 支持 | |
最大转移概率 | 是 | 是 | 不需要 | 不需要 | 支持 | |
功率谱轮廓识别 | 是 | 是 | 不需要 | 不需要 | 支持 | |
谱聚类 | 是 | 是 | 需要 | 不需要 | 有可能 |
表2
基于神经网络的大尺度衰落建模分类"
类型 | 特点 | 文献 |
不同类型的训练集 | 输入层的训练集为表征信道的特征参数 | 文献[17, 60-65, 67-68, 71-72] |
输入层的训练集为与环境有关的变量 | 文献[59, 68, 69-70, 73-75] | |
适用于室内 | 文献[60-61] | |
不同建模环境 | 适用于农村 | 文献[62] |
适用于城市 | 文献[63-66, 74-75] | |
适用于郊区 | 文献[67-68] | |
适用于矿井环境中UWB信道 | 文献[69-70] | |
不同建模频段 | 适用于毫米波频段 | 文献[17] |
适用于UHF频段 | 文献[59, 71-72] | |
适合于VHF频段 | 文献[59, 73] | |
最佳训练方案的测试 | 产生最佳性能的神经网络的训练集为纬度、经度、海拔和距离,包含9个隐含层 | 文献[76-77] |
表4
基于神经网络的小尺度衰落建模的特性参数和特点"
神经网络类型 | 模型输出的特性参数 | 特点 | 文献 |
FNN | CIR的幅值 | 对MIMO信道进行建模 | 文献[53] |
接收功率、均方根时延扩展、角度扩展 | 针对毫米波信道 | 文献[56] | |
CNN | 接收功率、时延、到达角、离开角、接收端到达角、发射端离开角 | 针对毫米波频段的三维MIMO室内信道 | 文献[57] |
BPNN | 信道传递函数 | 适合高铁信道建模 | 文献[54] |
CIR的幅值和相位 | 利用BPNN去噪,利用PCA提取CIR在频域的隐藏特征 | 文献[6, 82] | |
接收功率、到达角 | 对5G毫米波时变信道进行建模 | 文献[17,81] | |
RBFNN | 多普勒频偏 | 用于逼近平坦衰落信道 | 文献[55] |
接收功率、均方根时延扩展、角度扩展 | 针对毫米波信道 | 文献[56] | |
CIR的幅值 | 优化了传统的三维射线追踪法 | 文献[83] |
表5
国内外针对无线信道场景识别的研究方法"
文献 | 涉及的方法 | 特征参数 | 特点 |
文献[95] | k-means、SVM等 | 多种信道统计特性参数 | 先判断属于哪种散射,再判断属于哪类场景,降低了复杂度 |
文献[96] | SVM | 角度、功率 | 可以解决监测模糊的问题,但无法准确判断传输环境 |
文献[97] | GBDT | 功率、时延、峰度、偏度、上升时间 | 尤其适用于毫米波信道场景分类,准确率高、复杂度有限 |
文献[98] | UKFNN、AP | 信道增益 | 先区分再识别,方法简单效率高,但各别场景准确率低 |
文献[99] | GMM、CNN | 时延、功率幅值、多普勒频偏 | 可自动获取特征,并对场景进行分类 |
文献[100] | CNN、DBN | 频率、CIR、时延 | CNN和DBN分别应用到混合干扰场景识别与信道场景识别 |
文献[101] | k-means、k-NN、GMM、SVM | K因子、时延扩展、角度扩展、路径损耗 | 对仿真和实测的高铁信道数据进行降维和归一化等预处理,引入了混淆矩阵来评价性能 |
文献[102] | 图论、PCA、RBFNN | 功率、时延扩展、频率扩展 | 准确性较高,但无法集中存储大量数据且模型相对复杂 |
文献[103] | 随机森林 | 瞬时功率幅值、频率、相位 | 可以统计、处理较大的数据量 |
文献[104] | 决策树 | 信道系数 | 可以准确地识别到信道的特征 |
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