What is min frequency separation to maintain orthoganility

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i)The data rate of a QPSK modulated signal is 100 kbps. Assuming rectangular pulse shaping, what is the first-null (main-lobe) bandwidth of the modulated signal?

ii) The data rate of a continuous-phase FSK modulated signal is 100 kbps. What is the minimum frequency separation that can maintain orthogonality between the two tones (sinusoidal carriers)?

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