Question

[5+51(8 Q No. 5 a. What is the uplink power control? How it contribute to the uplink budget design and explain its effect on the overall carrier to noise ratio. b. It is a well-known phenomenon that the change in uplink C/N causes the change in downlink C/N. Suppose the thermal noise in an earth station receiver results in an overall (C/N)o ratio of 17dB in clear air and a signal is received by a bent pipe transponder with uplink (C/N)up ratio of 30 dB in clear air. If the rain causes an attenuation of 6 dB at the uplink then find downlink (C/N)dn and overall (C/N)o. an

please do all step neat and clean

if some value is missing than assume it.

Answer 1

Conthol PoweH 5 uPIfnk A key cOnto PoueH upLink Ladio managemeat 9esources function It isuse al maximize desied hile imity TO the Pouer of the received Signals genesiceted intesface The Ln

consisT upiPnk Pauts between Link +he PDsction of +he station Easuth Tuansittin Satellite . Phom the noise ConTPbution The uplink Ovenall noise Less The budget 4 9emains tempenature noise constant Hamains as unchanjed 1dB CCINO Clear aist Aup dB 6 dB CCN)oupliak raín = (CIN)oclear air- Aup dB dB 11 dB

Ovesalu (eIN), = CINDUPtink rain dB CcIN)up 1 dA + 30 TT 8,04 dB ak (CIN)up 30 d8 o4 dB 0.091 (Cldn Cluan lo.q dB