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The Satellite Commnication System Link Design Based on VSAT

Author: TianQingJun
Tutor: ChenHuanWen
School: Harbin Institute of Technology
Course: Signal and Information Processing
Keywords: Satellite link design Satellite channel modeling viterbi decoding algorithm Channel coding
CLC: TN927.21
Type: Master's thesis
Year: 2009
Downloads: 130
Quote: 0
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Abstract


Very small aperture terminal (VSAT) system is based on the Ku or Ka-band satellite communication system , it has the antenna size , low price advantages, in recent years , has been widely used in satellite communications . In the design of a satellite system , ground station equipment parameters to determine the main factors of the system reliability and cost . This part of the parameters mainly include the gain of the transmitter power of the transmitting antenna , a receiving antenna gain and receiver sensitivity . Ku-band has severe attenuation due to rain , the rain attenuation and noise sferics have carried out a detailed analysis , so that the system has higher reliability . Atmosphere , rainfall , flashing may cause the deterioration of the quality of the low-altitude -link channel , and the quantitative analysis of a variety of weather link loss helps to design a more reliable VSAT system . This article satellite communication channel propagation characteristics , focusing on analysis of the the rainfall weakened signal efficiency , increase the receiving system noise temperature . On this basis, the establishment of a satellite communication channel simulation model simulation and BER performance of satellite communication channel model provides a theoretical basis for satellite communication link analysis and Rain Fade Countermeasures . Serious signal attenuation in inclement weather , a good channel coding in order to reduce the satellite link is of great significance for ensuring the quality of the signal . In satellite communications , forward error correction coding (FEC) has been widely applied. Wherein the convolutional code is the most widely used . In the encoding process , convolutional codes make full use of the correlation between each code word , in a similar error correction capability , low bit rate convolutional code encoding / decoding devices are often simple score group code . Thus the forward error correction system has been widely used in satellite communications . The Viterbi decoding algorithm is the convolutional code in a maximum likelihood decoding algorithm , the degree of constraint in the code is smaller, its high efficiency of the decoding algorithm , the fast , the decoder is also relatively simple . This article used by the Viterbi decoding of the convolutional code as the satellite channel coding .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Satellite Communications and Space Communications > Satellite Communications > Satellite communications ground station
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