Digital Modulation Techniques

Digital Modulation Techniques

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Q.1) Draw & explain euclidian distance and PSD of BPSK, M-ary PSK & 16-ary QAM.

Q.2)Explain QPSK. Elaborate your answer with suitable expression, signal space& spectral representation. How QPSK signal is generated and received? What is the difference between OQPSK & QPSK?

Q.3) Error occurs in DPSK in pair & in DEPSK error always occurs in single bit. Explain with suitable example.

Q.4) Describe the scheme to recover the baseband signal in BPSK. With the help of block diagram and signals marked at input, output of these blocks. Also show that output of receiver is proportional to square root of power within the bit duration.

Q.5) Sketch the Power Spectral density of BPSK signal and estimate the bandwidth where input data rate is 10Mbps and carrier has a frequency of 70Mhz. 

Q.6) Describe the transmitted signal for i) 16 MPSK and ii) 16 QASK when binary message to be transmitted are {m(n)}={1,01,1,0,1,0,0,1,1,1,0,.}. Consider digital input data rate is 10Kbps and average energy per bit is 0.02 units and carrier frequency is 1MHz t output of receiver is proportional to square root of power within the bit duration.

Q.7) The bit stream b(t) is to be transmitted using Offset QPSK. If b(t)=001010011010 , sketch Offset QPSK output. Assume carrier frequency equals half of bit frquency. 

Q.8) Explain Transmitter and Receiver of DEPSK..

Q.9) Explain transmitter and receiver of MSK.

Q.10) Compare QASK & QPSK based

                 1. Modulation              2. Euclidian Distance  

                3.Probability               4.Noise immunity 

               5.Complexity              6.Location of signal points 

               7.Type of Demodulation    

 Draw signal space representation for both.

Note: Assignment Submission next week in tutorial session.