摘要
针对短波信道多径、衰落、多普勒频移和频扩的特点,设计了一种以Watterson模型为基础的纯软件短波信道仿真算法,并应用Matlab进行仿真实现,仿真结果验证了算法的有效性。同时,就Watterson模型中各子路径的时间延迟和多普勒频移不是时变参数这一不足,提出了模型的改进方案,将多径时延和多普勒频移建模为满足高斯分布的随机变量,从而更好地反映短波信道的时变特性,扩展了Watterson模型的适用条件和有效带宽,并进行了仿真验证。该算法既适应于全数字化短波通信系统的仿真,又可以方便地应用到短波信道半实物模拟器中,具有重要的实际意义。
A software High Frequency（HF） channel simulation algorithm based on Watterson model is presented according to the characters of multipath, fading, Doppler frequency shift and spread in HF channel. The algorithm is implemented by a Matlab program and proved to be valid. In conventional Watterson model, the time delay and frequency shift of each propagation path are not time-varying. Aiming at this shortcoming, the improved Watterson model is presented. Both the time delay and frequency shift of each propagation path are modeled as Gaussian random variables, making the model applicable to more HF propagation channels with larger bandwidth. At last, the model is also implemented by a Matlab program and proved to be valid. This method is applicable to the simulation of digital shortwave communication system, and can be implemented in real-time hardware channel simulator easily. It has an important practical significance.
出处
《指挥控制与仿真》
2009年第6期76-78,83,共4页
Command Control & Simulation
关键词
短波信道模型
多径
衰落
频移
频扩
HF channel model
multipath
fading
frequency shift
frequency spread
