Satellite Communications/Bandwidth calculation

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Question
how to calculate satellite carrier bandwidth from the following parameters:
1-symbol rate.
2-roll off.
3-FEC.
4-modulation type.

Answer
Hi Mr Ayman,
These are actually signal parameters that are used for arriving at how much margin we can allow in the design during Link Budget. Bandwidth mainly depends on the Data Rate and the Modulation Type. Effective Noise bandwidth consideration dictate the threshold for margin. You can refer any Link Budget Calculators, now available aplenty, for this.
For derivations it is better to refer Text books, Tri. T. Ha as one of them. It is Digital Satellite Communications Text Book that explains very clearly the derivation.
Cheers/GT

Satellite Communications

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TIRUMALA RAO G

Expertise

Satellite Communications Applications, Link Calculations, Teleports, Earth Stations,VSAT, Tracking, Mobile Communications, Next Generation Networks.

Experience

40 Years. Indian Space Research Organisation, PANAMSAT, Satellite Based VSAT Networks, IP Networks.

Organizations
ISRO, PANAMSAT, Engineering Institution for Higher Education (GVP College of Engineering), Consultancy.

Education/Credentials
Graduate in Electronics and Communication Engineering with Distinction. Guiding scholars for their Doctoral thesis in related areas in Academics.

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