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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。
Based on the introduction of air channel modeling, this paper analyzes the commonly used parameters describing the characteristics of low-altitude wireless channels, and analyzes the propagation characteristics of low-altitude channels such as multipath delay and Doppler shift in different scenarios Introduction, gives a general model of low-altitude channel modeling. The commonly used LMS, RLS and CMA channel equalization algorithms for low-altitude wireless channels are introduced. Finally, the research on modeling of low-altitude wireless channel and the equalization algorithm for low-altitude channel are prospected. It is worth noting that the improvement of the existing equalization algorithm, the combination of coding and equalization, the combination of maximum Doppler estimation and adaptive equalization are noteworthy research content.