SECTION B
- (a) Describe phase shift keying (PSK) and quadrature amplitude
modulation (QAM) and explain the differences between these two
modulation methods. Draw graphs to illustrate the two methods.
(5 marks) ->
(b) Explain with the aid of constellation scatterdiagrams the performance
of PSK and rectangular QAM with the same signal to noise ratio and
alphabet size of M symbols. Your answer should include consideration
of at least two symbol sizes (M) and different signal to noise ratios in
order to discuss their effects on bit error rate and symbol error rate.
(10 marks) ->
(c) Describe how QAM and PSK are used in digital communications. As
part of your answer you should consider the implications of their
performance considerations addressed in part b.
(5 marks) ->
If you use MATLAB or Simulink to help answer this question you
should explain the MATLAB code and/or Simulink model as well as
also uploading the .m, .mlx and/or .slx file(s)