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10 2 ban ball 0 R (1 Question 1: (Marks: 5+5) An ideal wireless channel has a low-pass frequency response in the frequency range 0 - 100 kHz. (a) Design a communication system with 16-QAM signal for transmitting data at 400 kbps. For spectral shaping, use a raised cosine spectral characteristic. Sketch a block diagram of the system. h (b) Repeat (a) for same bit rate but with QPSK symbols using duo-binary pulses (not raised-cosine or root raised-cosine pulses). What is the changed symbol rate? What are the different received amplitude levels with their individual probability of occurrence? [Hint: the information sequence is not binary, rather complex quaternary like: +1+;] zato