Task 2 (Design and analyze AM communication system)
1) Sketch the block diagram of the transmitter communication system for different modulation techniques (DSB_LC, DSB_SC, SSB, VSB).
2) Analyze mathematically the output of each sub block in the transmitter block diagram of each modulation technique and sketch the signal in the frequency domain before and after modulation process. Assume the message signal to be modulated is m(t) = 6 cos(4000t) cos(6000t).
3) Explain how each modulated signal can be recovered in the receiver. Sketch the receiver block diagram for each modulation type.
4) Build the modulator and demodulator (non-coherent for DSB_LC and coherent for DSB_SC) using SIMULINK (without using the communication Toolbox) for the message signal m(t) = 6 cos(4000t) cos(6000t).
5) State the advantages and disadvantages of using coherent and non-coherent receiver.
6) Compare between the DSB_LC, DSB_SC, and VSB modulation techniques regarding bandwidth, power efficiency, complexity.
7) Within your work team, three colleagues are debating about the average power of the modulated signal in DSB_SC and SSB. One argues in favor of DSB_SC, the other in favor of SSB, and the third asserts that both have the same average power. Resolve their arguments by providing a justification based on mathematical calculations.
8) Your company has received a request to design an AM transmitter for a radio broadcasting station, and your manager has assigned you the task. Which modulation techniques will you choose and why? Specify the frequency range within which you have to work for the carrier signal and justify your choice.
9) Explain in detail the various sources of noise in a communication system.
10) Identify the type of noise that is inherently unavoidable in any communication system and provide an explanation for the reasons behind that.
