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HW3 - ECEN 661 Modulation Theory Homework#3 Assignment Date...

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ECEN 661 - Modulation Theory Homework #3 Assignment Date: 2/4/08 Due Date: 2/11/08 1. Sketch the phase trellis diagram and the phase state diagram for each of the following modula- tion formats: (a) Full response binary CPFSK with . (b) Partial response CPM with and a frequency pulse given by 2. Suppose we use a 16-QAM modulation format. Relative to the data rate, calculate the 3dB bandwidth, the first null bandwidth, and the 30dB bandwidth for each of the following pulse shapes: (i) square pulse, (ii) half sinusoid pulse, (iii) full-cosine pulse,. 3. (Text 4.14, 4th. ed., modified) Consider an equivalent low-pass digitally modulated signal of the form where and are two sequences of statistically independent binary digits and is a half-sinusoidal pulse defined as This type of signal is known as offset QPSK since the two BPSK signals on the I and Q parts are h 2 3 -- = h 1 2 -- = g t ( ) 1 4 T s --------, 0 t 2 T s < , 0, otherwise. = u t ( ) a n g t 2 nT s ( ) jb n g t 2 n 1 + ( ) T s ( ) [ ] n = a n 1 ± { } b n 1 ± { } g t ( ) g t ( ) π t 2 T s --------

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HW3 - ECEN 661 Modulation Theory Homework#3 Assignment Date...

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