VVI - Optimization of Satellite Link Design Avadh Nandra1...

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Optimization of Satellite Link Design Avadh Nandra 1 , Jivesh Govil 2 , Harkeerat Kaur 3 Department of : Electrical Engineering 1,2 , Electronics and Communication 3 George Washington University 1 , University of Michigan 2 , GGS Indraprastha University 3 [email protected] [email protected] [email protected] Abstract- The design of satellite communication system is a complex process requiring compromises between many factors to achieve the best performance at an acceptable cost. In the Present World GEO satellites carry the vast majority of the world’s satellite traffic, therefore it becomes utmost for the link designer to design with a optimum utilization of space segment as well as transponder downlink EIRP. We ( authors) has performed the experiments by varying some of the entities which play a vital role in the link budget and observed the complete physical changes affecting the overall link budget profile. Using such results based upon our work, we performed a theoretical predictions on some of the major problems experienced by the satellite users which includes losses, and attenuation by rain or by equipments, outage of the system etc. Results of these theoretical predictions, acted as an impetus in knowing that the mismanagement of the link budget calculation lead to vital problems such as interference, cross polarization of the antenna and rising of the noise floor of transponder etc. I. INTRODUCTION The Link budget played a vital role in the deployment of any radio frequency network. It defines the amount of power available in the communication link for trans and receive. It has been experienced that the factors, which influence system design in satellite communication are the choice of frequency band, atmospheric propagation effects and multiple access technique. All communication links should be designed to meet certain performance objectives, usually a bit error rate (BER) in a digital link or a signal to noise ratio (S/N) in an analog link, measured in the baseband channel. The baseband channel is where an information carrying signal is generated or receipt. The baseband channel BER or S/N ratio is determined by the carrier to noise ratio (C/N) at the input to the demodulator in the receiver. C/N ratio is calculated at the input of the receiver, at the output terminals (or port) of the receiving antenna. RF noise received along with the signal and noise generated by the receiver are combined into an equivalent noise power at the input of the receiver. In a satellite link, there are two signal path, an uplink from the earth station to the satellite, and a downlink from the satellite to the earth station [1]. The overall C/N at the earth station receiver depends on both links, and both therefore must achieve the required performance for a specified percentage of time.
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This note was uploaded on 03/31/2012 for the course ECE 101 taught by Professor X during the Spring '12 term at Florida A&M.

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VVI - Optimization of Satellite Link Design Avadh Nandra1...

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