卫星通信信道的传输特性及vsat下行链路具体仿真模型的(常用版).doc

section, characters of ka band satellite–communication is introduced. Then a model of

Ka band VSAT down-link which subject to rain attenuation and scintillation is built.

I use Matlab/Simulink to simulate this model. All the model-data is based on the city of

guangzhou ,China.

link_availability is also investigated.In this down-link model ,I found that the rain

attenuation play a very important role who mainly inducing the system characters

degration. Troposphere scintillation can affect the amplitude of signal,too..

Different thresh-hold of M is defined to evaluate the unavailability of the link.And the

bigger of M,the more availability of the channel.

rain-attenuation is also introduced. For example ,the power control, error-corrected and

multirates coding rate and so on.

In the Appendix ,is the reference of this paper ,and thanks for their important

work and data again..

第二章 KA 频段卫星通信信道的传输特性 .................................7

第三章 VSAT 下行链路具体仿真模型的建立 ...............................17

第四章 仿真结果分析 .................................................29

第五章 结论 .........................................................39

致谢 ................................................................41

参考文献 ............................................................43

附录 ................................................................45