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Ece 523: Satellite Communication And Broadcasting Question Paper

Ece 523: Satellite Communication And Broadcasting

Course:Bachelor Of Engineering In Electrical And Electronics Engineering

Institution: Moi University question papers

Exam Year:2011

ECE 523: SATELLITE COMMUNICATION AND BROADCASTING

QUESTION ONE
a. State the three Kepler's laws. (3mks)

b. Mention any two advantages and also two disadvantages of Geostationary earth orbit. (4mks)

c. Using relevant sketches, briefly explain how the height of the satellite determines the coverage beam antenna and the distance of the earth stations from the edge of the coverage to the satellite. (5mks)

d. Mention any two applications of satellite communication systems. (2mks)

QUESTION TWO
a. Explain any three factor that may cause satellite link impairment. (6mks)

b. The distance between satellite and east station is 'd' = 37,000 Km, the Up link frequency 'f' = 6.175 GHz. Determine the uplink loss. (5mks)

c. Sketch a satellite TDMA scheme. (3mks)

QUESTION THREE
a. Explain the phenomenon of inter-modulation in satellite communication. (3mks)

b. Determine frequencies of third-order inter-modulation in - band components for an amplifier with the bandwidth from 10 ve 11 GHz and having two carries, one at 10.5 GHz and the other at 10.6 GHz. (6mks)

c. Using sketches, explain how the result of (b) will affect the satellite communication. (5mks)

QUESTION FOUR
a. Briefly explain amplifier back off. (4mks)
b. Determine the power rating of ground transmitter operating at following conditions.
Transmitter EIRP 37.97 dB W, Up link pain attenuation of 0.0 dB, uplink path loss 199.62 dB, satellite G/T (dB/K) - 5.00 (6mks)

c. Calculate power rating of ground transmitter operating at following conditions. Number of carriers - 1, Power per carrier - 0.28 W, Amplifier back off - 0 dB. (4mks)

QUESTION FIVE
a. Compare any five properties of TDMA and CDMA. (5mks)
b. Using relevant sketches, briefly explain the concept of TDMA. (6mks)
c. Calculate satellite operating band-width (kbps) per carrier for the satellite transmission rate 19.2 bits per symbol equal 2. (3mks)

QUESTION SIX
a. Derive antenna diameter. (2mks)
b. Derive the antenna gain, in decibel. (6mks)
c. Calculate the gain of a 3.80 m parabolaidal antenna with operating frequency of 6.175 GHz and aperture efficiency of 0.55. (6mks)

QUESTION SEVEN
a. Define Transmit EIRP (equivalent isotropic power.) (3mks)

b. Briefly explain the three classes of bandwidth allocation. (9mks)

c. State any two satellite availability parameters. (2mks)

Ece 523: Satellite Communication And Broadcasting Question Paper

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