Q4. (20 MARKS TOTAL FOR ALL PARTS) A. (10 Marks) Consider coherently demodulated M-ary PSK modulation. Consider the case of raised cosine pulse shaping with a roll-off factor of a The required bit error rate is Pa 10 For a fixed a and M, use Matlab to compute the required in dB to achieve P 10 and the required transmission bandwidth B for M-ary PSK for M 2,4,8,16, and 32 Then plot the requiredin dB to achieve Pa 106 (on the Y axis) vs(on the X axis), where B is the transmission bandwidth in Hz and R, is the transmission bit rate in bits/s Compute in dB andfor the separate cases of the roll-off factors of a 0, 0.15, 0.25, 0.35, 0.45, and 1.00 On the same axes, plot 6 curves, one curve for each value of . Hint: The Matlab function for Q (x) is qfuncinv(x) B. (10 Marks) Consider coherently demodulated M-ary FSK modulation Consider the case of raised cosine pulse shaping with a roll-off factor of The required bit error rate is Pa 10 6 For a fixed and M. use Matlab to compute the required-_ in dB to achieve 10-6 and the required transmission B for M-ary FSK for M 2,4,8,16, and 32. Then plot the required-in dB to achieve P, = 10 6 (on the Y axis) vs (on the X axis) where B is the transmission bandwidth in Hz and R, is the transmission bit rate in bits/s Compute in dB and for the separate cases of the roll-off factors of a 0, 0.15, 0.25, 0.35, 0.45, and 1.00 On the same axes, plot 6 curves, one curve for each value of . Q4. (20 MARKS TOTAL FOR ALL PARTS) A. (10 Marks) Consider coherently demodulated M-ary PSK modulation. Consider the case of raised cosine pulse shaping with a roll-off factor of a The required bit error rate is Pa 10 For a fixed a and M, use Matlab to compute the required in dB to achieve P 10 and the required transmission bandwidth B for M-ary PSK for M 2,4,8,16, and 32 Then plot the requiredin dB to achieve Pa 106 (on the Y axis) vs(on the X axis), where B is the transmission bandwidth in Hz and R, is the transmission bit rate in bits/s Compute in dB andfor the separate cases of the roll-off factors of a 0, 0.15, 0.25, 0.35, 0.45, and 1.00 On the same axes, plot 6 curves, one curve for each value of . Hint: The Matlab function for Q (x) is qfuncinv(x) B. (10 Marks) Consider coherently demodulated M-ary FSK modulation Consider the case of raised cosine pulse shaping with a roll-off factor of The required bit error rate is Pa 10 6 For a fixed and M. use Matlab to compute the required-_ in dB to achieve 10-6 and the required transmission B for M-ary FSK for M 2,4,8,16, and 32. Then plot the required-in dB to achieve P, = 10 6 (on the Y axis) vs (on the X axis) where B is the transmission bandwidth in Hz and R, is the transmission bit rate in bits/s Compute in dB and for the separate cases of the roll-off factors of a 0, 0.15, 0.25, 0.35, 0.45, and 1.00 On the same axes, plot 6 curves, one curve for each value of
