Homework Help is Here – Start Your Trial Now!
Engineering
Electrical Engineering
6-1. You are designing an FDM-PCM/FDMA analog link that will occupy 36 MHz of an INTELSAT VI transponder with 10 users of equal bandwidth. The uplink and downlink center frequencies of the occupied band are 5985.5 MHz and 3760.5 MHz. The distance from the satellite to your earth station is 40,000 km. The saturation uplink flux density (total – all carriers) for your uplink is - 75 dBW/m2 and the satellite's G/T is = -11.6 dB/K. At saturation, the transponder EIRP for your downlink is 29 dBW and the earth station's G/T is 41 dB/K. Assume that the transponder is linear (an unrealistic scenario - but do it this way such that BOI = BOo, dB. The intermodulation carrier to noise ratio, (C/N)¡, in dB, is related to the back-off BOo in dB by (C/N)31M = 7.86-0.714 * BOO In other words, at Xponder saturation the value of (C/N)31m = 7.86 dB and for example BOo = -6 dB the (C/N)31m = 7.86 – 0.714*(-6) = 12.14 dB. (a) Find the maximum overall carrier-to-noise ratio (C/N), in dB that this link can achieve. (b) What back-off must be used to achieve it? (When you need a frequency in your calculations, use the uplink or downlink center frequency as appropriate.) Make your calculations for beam center (i.e., line-of-sight antenna gain = peak gain).

6-1. You are designing an FDM-PCM/FDMA analog link that will occupy 36 MHz of an INTELSAT VI transponder with 10 users of equal bandwidth. The uplink and downlink center frequencies of the occupied band are 5985.5 MHz and 3760.5 MHz. The distance from the satellite to your earth station is 40,000 km. The saturation uplink flux density (total – all carriers) for your uplink is - 75 dBW/m2 and the satellite's G/T is = -11.6 dB/K. At saturation, the transponder EIRP for your downlink is 29 dBW and the earth station's G/T is 41 dB/K. Assume that the transponder is linear (an unrealistic scenario - but do it this way such that BOI = BOo, dB. The intermodulation carrier to noise ratio, (C/N)¡, in dB, is related to the back-off BOo in dB by (C/N)31M = 7.86-0.714 * BOO In other words, at Xponder saturation the value of (C/N)31m = 7.86 dB and for example BOo = -6 dB the (C/N)31m = 7.86 – 0.714*(-6) = 12.14 dB. (a) Find the maximum overall carrier-to-noise ratio (C/N), in dB that this link can achieve. (b) What back-off must be used to achieve it? (When you need a frequency in your calculations, use the uplink or downlink center frequency as appropriate.) Make your calculations for beam center (i.e., line-of-sight antenna gain = peak gain).

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
See similar textbooks
icon
Related questions
Question
6-1. You are designing an FDM-PCM/FDMA analog link that will occupy 36 MHz of an INTELSAT VI transponder with 10 users of equal bandwidth. The uplink and downlink center frequencies of the occupied band are 5985.5 MHz and 3760.5 MHz. The distance from the satellite to your earth station is 40,000 km. The saturation uplink flux density (total - all carriers) for your uplink is - 75 dBW/m2 and the satellite's G/T is = -11.6 dB/K. At saturation, the transponder EIRP for your downlink is 29 dBW and the earth station's G/T is 41 dB/K. Assume that the transponder is linear (an unrealistic scenario - but do it this way such that BOI = BOo, dB. The intermodulation carrier to noise ratio, (C/N), in dB, is related to the back-off BOo in dB by (C/N)31M = 7.86 - 0.714 * BO0 In other words, at Xponder saturation the value of (C/N)31M = 7.86 dB and for example BOo = -6 dB the (C/N)31M = 7.86 0.714*(-6) = 12.14 dB. (a) Find the maximum overall carrier-to-noise ratio (C/N), in dB that this link can achieve. (b) What back-off must be used to achieve it? (When you need a frequency in your calculations, use the uplink or downlink center frequency as appropriate.) Make your calculations for beam center (i.e., line-of-sight antenna gain = peak gain).
Transcribed Image Text:6-1. You are designing an FDM-PCM/FDMA analog link that will occupy 36 MHz of an INTELSAT VI transponder with 10 users of equal bandwidth. The uplink and downlink center frequencies of the occupied band are 5985.5 MHz and 3760.5 MHz. The distance from the satellite to your earth station is 40,000 km. The saturation uplink flux density (total - all carriers) for your uplink is - 75 dBW/m2 and the satellite's G/T is = -11.6 dB/K. At saturation, the transponder EIRP for your downlink is 29 dBW and the earth station's G/T is 41 dB/K. Assume that the transponder is linear (an unrealistic scenario - but do it this way such that BOI = BOo, dB. The intermodulation carrier to noise ratio, (C/N), in dB, is related to the back-off BOo in dB by (C/N)31M = 7.86 - 0.714 * BO0 In other words, at Xponder saturation the value of (C/N)31M = 7.86 dB and for example BOo = -6 dB the (C/N)31M = 7.86 0.714*(-6) = 12.14 dB. (a) Find the maximum overall carrier-to-noise ratio (C/N), in dB that this link can achieve. (b) What back-off must be used to achieve it? (When you need a frequency in your calculations, use the uplink or downlink center frequency as appropriate.) Make your calculations for beam center (i.e., line-of-sight antenna gain = peak gain).
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 4 steps with 45 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Digital Modulation Scheme (Amplitude-Shift Keying [ASK], Phase-Shift Keying [PSK], Frequency-Shift Keying [FSK])
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Fundamentals of Electric Circuits
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:
9780078028229
Author:
Charles K Alexander, Matthew Sadiku
Publisher:
McGraw-Hill Education
Electric Circuits. (11th Edition)
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:
9780134746968
Author:
James W. Nilsson, Susan Riedel
Publisher:
PEARSON
Engineering Electromagnetics
Engineering Electromagnetics
Electrical Engineering
ISBN:
9780078028151
Author:
Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:
Mcgraw-hill Education,
SEE MORE TEXTBOOKS