Explaining concept of cable transmission network

Question

Answer the following questions.

Question 1) What kind of modulation techniques may be used in optical satellite communication? Explain their working in detail.

Question 2) Explain in detail why it is not possible to have the direct optical communication link between earth station and communication satellite.

Question 3) Describe the modern concept of cable transmission network.

Question 4) For a satellite earth station receiver working on 4GHz, the typical various gains and noise temperatures are T_in = 50 K; T_RF = 50 K_Tm = 500 K, T_IF = 1000 K, G_RF = 23dB, G_m = 0 dB, G_IF = 30 dB. Compute the system noise temperature.

Question 5) Explain SCPC and CSSB systems in detail.

Question 6) Write brief notes on following:

(a) TDMA frame format.

(b) Reference burst in TDMA system.

Question 7) Name the satellites for earth observation and scientific studies.