航空信道统计模型的改进与实现  

Modified Stochastic Model of Aeronautical Channel

作　　者：朱秋明[1] 徐大专[1] 吕卫华[2] 陈小敏[1] 

机构地区：[1]南京航空航天大学信息科学与技术学院,南京210016 [2]中国空空导弹研究院,河南洛阳417009

出　　处：《应用科学学报》2009年第6期569-573,共5页Journal of Applied Sciences

基　　金：江苏省自然科学基金(No.BK2007192)资助项目

摘　　要：证明了基于谐波信号叠加产生独立且具有部分U型多普勒功率谱的复高斯随机过程时各支路多普勒频率的约束条件.基于该条件提出一种最佳入射角的设计方案,将入射角分为随机和固定取值两部分,不但保证了相位的随机均匀分布,而且满足多普勒频率的约束条件.利用改进的谐波信号叠加方法和等效离散时间模型实现了多径环境下航空信道小尺度衰落的统计建模.理论分析和仿真结果表明,该仿真模型的多普勒功率谱和时延功率谱等统计参数均与参考模型一致.The sum-of-sinusoids （SOS） method has been widely used for creating complex Gaussian processes. Restriction of each echo＇s Doppler frequency is proved, which confirms the generated processes are mutually uncorrelated and have a part of U shaped Doppler power spectrum （DPS）. An improved SoS method based on optimal angle of arrival （AoA） is then proposed. The optimal AoA consists of a deterministic part and a random part. This confirms that the uniform distribution of phase and the Doppler frequency meet the restrictions. With the new method and the equivalent discrete-ti.me model, a modified aeronautical channel model for small-scale fading is presented. Analysis and simulation results show that the DPS and time delay power spectrum of the simulation model as agree with the reference model.

关 键 词：航空信道模型 小尺度衰落 谐波信号叠加 

分 类 号：TN911[电子电信—通信与信息系统]