Explain how the data rate over a channel can be increased, without increasing thebandwidth? What is the disadvantage of this approach

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Determine the isotropic free space loss at 4 GHz for the shortest path to a synchronoussatellite from earth (35,863 km).7. Given a signal as follows, compute the fundamental frequency, spectrum andbandwidth. Also calculate the channel capacity using Nyquest criteria using M= 2, 4, 8,where M is the number of levels.??(??) = 5 sin(200????) + sin(600????)8. Explain how the data rate over a channel can be increased, without increasing thebandwidth? What is the disadvantage of this approach?Hint: Nyquist Theorem9. What is the main difference between Packet switching Virtual Circuit and CircuitSwitching? Also discuss the advantages of Packet switching Virtual Circuit over CircuitSwitching.10. In a LOS communication, consider d = 40km, the requirement is to make two antennas(transmitter and receiver) such that the height of one antenna should be twice of theother. Considering this, find the appropriate heights of these two antennas.