低空无线信道建模及其均衡技术研究进展

Research Progress of Low-altitude Wireless Channel Modeling and Equalization Techniques

在介绍航空信道建模基础上,借鉴地面移动信道研究成果,分析了描述低空无线信道特性的常用参数,对不同场景下低空信道的多径时延、多普勒频移等传输特性作了详细介绍,给出了低空信道建模的一般模型。介绍了低空无线信道常用的LMS、RLS、CMA三种信道均衡算法。最后,对低空无线信道建模研究以及适合低空信道的均衡算法进行展望,指出在改进现有均衡算法、编码和均衡相结合、最大多普勒估计和自适应均衡相结合等方面是值得关注的研究内容。

The air channel modeling is introduced based on ground mobile channel and commonly used parame- ters for describing low-altitude wireless channel characteristics are analysed. The low-altitude multi-path delay and Doppler frequency shift transmission characteristics in different scenes are described and the general model of low-altitude channel modeling is given. The commotdy used three channel equalization algorithms（LMS,RKS and CMA） for low- altitude radio channel are presented. Finally, the low- altitude wireless channel modeling and channel equalization algorithms are expected. It is pointed out the improvement of existing equalization algo-rithms, coding and equalization combination, the maximum Doppler estimation and adaptive equalization combi- nation should be focused.