面向宽带航空数据链复杂多变应用场景的信道估计方法  

Channel Estimation Method for Complex and Variable Application Scenarios of Broadband Aviation Data Link

作　　者：姚元飞 卢新平 邓柯 蔡方凯 YAO Yuanfei;LU Xinping;DENG Ke;CAI Fangkai(School of Network&Communication Engineering,Chengdu Technological University,Chengdu 611730,China;China Satellite Network Exploration Co.,Ltd.,Chongqing 401123,China)

机构地区：[1]成都工业学院网络与通信工程学院,成都611730 [2]中国星网网络应用有限公司,重庆401123

出　　处：《成都工业学院学报》2024年第5期17-21,共5页Journal of Chengdu Technological University

基　　金：教育部新工科研究与实践项目(E-XTYR20200661);四川省科技成果转移转化项目(24ZHSF0488)。

摘　　要：针对复杂多变航空信道场景导致宽带航空数据链信道参数难以精确估计的问题,以及小体积、低功耗等航空通信工程应用需求,提出了一种几何距离插值联合自适应滤波的高性能低复杂度信道估计方法。首先,根据宽带航空数据链传输信道的特点,求取导频位置的信道频域响应;其次,在最佳匹配滤波设计原则的基础上,提出了一种自适应滤波方法;最后,在现有的插值信道估计方法的基础上,提出了一种高效的几何距离相关算法。从而,避免了压缩感知、深度学习等信道估计方法需要的信道信息统计和矩阵求逆等复杂运算,并且具有较高的估计精度和较强的信道场景自适应能力。4种航空信道场景下的实验结果表明,为使系统误码率达到10-6,该方法相对现有方法所需比特信噪比可以降低4.0 dB,在一定程度上提高了航空飞行安全水平。In view of the problem that the channel parameters of broadband aviation data link are difficult to estimate accurately due to complex and variable aviation channel scenarios,and the application requirements of aviation,telecommunications engineering such as small size and low power consumption,a high-performance and low complexity channel estimation method based on geometric distance interpolation combined with adaptive filtering was proposed.Firstly,according to the characteristics of the transmission channel of broadband aviation data link,the channel frequency domain response of the pilot position was obtained.Then,based on the principle of optimal matching filter design,an adaptive filtering method was proposed.Finally,based on the existing interpolation channel estimation methods,an efficient geometric distance correlation algorithm was proposed.Therefore,it avoids the complicated operations of channel information statistics and matrix inversion required by channel estimation methods such as compressed sensing and deep learning,and has high estimation accuracy and strong channel scene adaptation ability.The experimental results of four aviation channel scenarios show that in order to achieve the 10-6 bit error rate,the proposed method can reduce the bit signal-to-noise ratio by 4.0 dB compared with the existing method,which improves the aviation safety level to a certain extent.

关 键 词：航空信道场景 信道估计 航空通信 导频 几何距离 

分 类 号：TN924[电子电信—通信与信息系统]