The minimum required spacing is the difference between the(a) Center of the spectral main lobe and first zero crossing(b) First and second zero crossing(c) First and last zero crossing(d) None of the mentionedThe question was posed to me in an interview for internship.I'd like to ask this question from Coherent Detection in chapter Bandpass Modulation and Detection of Digital Communications

The minimum required spacing is the difference between the(a) Center o

1.	The minimum required spacing is the difference between the(a) Center of the spectral main lobe and first zero crossing(b) First and second zero crossing(c) First and last zero crossing(d) None of the mentionedThe question was posed to me in an interview for internship.I'd like to ask this question from Coherent Detection in chapter Bandpass Modulation and Detection of Digital Communications
Answer» Right OPTION is (a) Center of the spectral main lobe and first ZERO CROSSING The explanation is: The frequency difference between the center of the spectral main lobe and the first zero crossing is CALLED as the minimum REQUIRED spacing in non coherent detection.

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