Question 4 (25 Marks) A binary data sequence {b,,b,b,,b,b,5,6,6,}={1,0,1,1,0,1,0,0} is modulated by QPSK as s(t)= - tabia b,(6)cos(275.0+ taby (1) sin(22.5.2) where f = 2 MHz and the in-phase and quadrature binary data streams {b,(0),b,(0)}={+1}. (a) (b) (c) Draw the signal-space diagram of the QPSK signal and clearly label the signal constellation. (6 marks) Sketch the QPSK signal waveforms of this data sequence. (8 marks) f The power spectrum of the input binary data sequence is 10-sinc 2000 Sketch the output spectrum for the QPSK signal. (6 marks) Calculate the bit rate of the input binary data in (c) (5 marks) (d) ) Question 4 (25 Marks) A binary data sequence {b,,b,b,,b,b,5,6,6,}={1,0,1,1,0,1,0,0} is modulated by QPSK as s(t)= - tabia b,(6)cos(275.0+ taby (1) sin(22.5.2) where f = 2 MHz and the in-phase and quadrature binary data streams {b,(0),b,(0)}={+1}. (a) (b) (c) Draw the signal-space diagram of the QPSK signal and clearly label the signal constellation. (6 marks) Sketch the QPSK signal waveforms of this data sequence. (8 marks) f The power spectrum of the input binary data sequence is 10-sinc 2000 Sketch the output spectrum for the QPSK signal. (6 marks) Calculate the bit rate of the input binary data in (c) (5 marks) (d) )