ECEN 661 - Modulation TheoryHomework #3Assignment Date: 2/2/06,Due Date: 2/9/061. Text 4.14.2. Suppose we use a QPSK modulation format. Relative to the data rate, calculate the 3dB band-width, the first null bandwidth, and the 40dB bandwidth for each of the following pulse shapes:(i) square pulse,(ii) half sinusoid pulse,(iii) full-cosine pulse,.3. Suppose we use a binary CPFSK modulation format with a modulation index of . For the following, assume a starting phase of . (a) Sketch the phase trellis diagram for the CPFSK signal.(b) Sketch a phase state diagram for the CPFSK signal. Be sure to label each branch of the state diagram with the complex envelope of the signal associated with that transition.4. Matlab Problem: (a) Write a program to construct the phase and frequency pulse shapes for a GMSK signal with an arbitrary time-bandwidth product, . Provide plots of both the phase and frequency pulse
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