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1. For a 64-PSK modulator with an input data rate(fb) equal to 36 Mbps and a carrier frequency of 100 MHz, determine the minimum double-sided Nyquist bandwidth(fN) and the baud. Sketch the output spectrum. 2. Determine the bandwidth efficiency for the following modulators: (a) QPSK = (b) 64-QPSK = (c) 128-QAM= 3. A radio channel has a bandwidth of 10 KHz and a SNR of 15 dB. What is the maximum data rate that can be transmitted: (a) Using any system? (b) Using a code with 64 possible states? 4. A modulator transmits symbols, each of which has 64 different possible states, 15,000 times per second. Calculate the baud rate and the bit rate. 5. What is the shannon limit for a standard telephone circuit with an SNR of 30 dB and a bandwidth of 3.3 KHz? 6. What is the maximum data rate possible for a standard telephone circuit with an SNR of 1023 and BW of 3 KHz using 8 bits per symbol?

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