基于双端截断功率谱密度的扩展Suzuki地面移动卫星信道模型

Extended Suzuki Model with Double-End Truncated Power Spectral Density for Land Mobile Satellite Channel

为使信道模型能更加准确地反映实际信道传播特性,根据多谱勒扩展功率谱密度在频域上的分布特性,提出一种基于双端截断功率谱密度的扩展Suzuki地面移动卫星信道模型.该模型假设接收信号的功率谱密度在低频段与高频段均被截断,推导其概率密度函数、电平交叉率等统计特性,并与实测数据进行比较.仿真结果表明,相比单端截断模型,该模型能够更好地吻合实测数据,更加准确地反映实际信道传播特性.在某些参数给定的情况下,该模型可以转化为其他窄带卫星信道模型,是一种适用性比较广的卫星信道模型.

In order to make channel model reflect real channel propagation characteristics more accurately,an extended Suzuki model with double-end truncated power spectral density for land mobile satellite channel was proposed according to the distribution characteristic of Doppler spread power spectral density in frequency domain.It was assumed in the model that,the power spectral density of the received signal was truncated in the low and high frequency region.The probability density function and level crossing rate of the model were derived,and compared with the experimental data.The simulation results indicate that the model can fit the experimental data better,reflect real channel propagation characteristics more accurately compared with the single side truncated model.It can be converted to other narrow-band satellite channel models when some parameters are given,and the model has a wide range of applicability.