Interview Questions for Communication System Designer Q-1: What is frequency shifting in the Frequency domain. How we can realize it practically. Q-2: What are signal and system can you explain with examples. Q-3: What is the Fourier series and Fourier Transform. Q-4: How we can analyze Noise in the communication system in terms of a wired and non-wired Communication system. Q-5: Why the autocorrelation function of white noise is impulse. Q-6: Which techniques we can expand signal in terms of complex exponential signal. Q-7: What is output when periodic signal transmits through LTI system.