无人机地空信道迭代接收机策略设计

以无人机数据链通信为背景,研究无人机地空信道的特性,得出该信道为频率选择性慢衰落信道,同时建立了适用于计算机仿真的无人机地空信道模型.为解决信息传输过程中的符号间干扰(ISI,inter-symbol interference)问题,将turbo均衡技术引入接收机中,同时针对慢变信道,结合基于LS算法的初始信道估计以及基于LMS算法的迭代信道估计技术,提出了一种适用于无人机地空信道的接收机策略,通过与自适应均衡技术和一次信道估计策略相比较,迭代接收策略在性能上要好于自适应均衡技术和一次信道估计策略,提出的低复杂性接收机策略可以为无人机地空通信提供有利的技术支撑.

Design of Iterative Receiver Strategy Based on the UAV Ground-Air Channel

In the background of the UAV data-link's communications,the characteristic of UAV's ground-air channel is studied and the conclusion that this channel is frequency-selective and slow-fading is drawn,meanwhile,the channel model satisfied for computer simulation is established.To solve the inter-symbol interference(ISI) in the transformation,the turbo equalization technique is adopted in receiver.Taken the slow-fading feature into consideration,the channel estimation method which is initially done with LS algorithm and iteratively carried out with LMS algorithm is adopted,therefore,the iterative receiver's strategy based on the channel is composed of these iterative concepts.Compared with adaptive equalization technique and once-channel-estimation strategy,the prevented technique is better than both of them in performance,which sufficiently supports the UAV ground-air communications.