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tut4_problems

tut4_problems - Department of Electrical Engineering EE 308...

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Department of Electrical Engineering EE 308: Communication Systems (Spring 2009) Course Instructor: Prof. Abhay Karandikar Problem Set 4 1. Figure 1 shows the idealized spectrum of a message signal m ( t ). The signal is sampled at a rate 1 kHz using PAM, with each pulse being of unit amplitude and duration 0 . 1 ms. Determine and sketch the spectrum of the resulting PAM signal. f (Hz) |M(f)| 400 -400 0 Figure 1: 2. Twelve di±erent message signals, each with a bandwidth of 10 kHz, are to be multiplexed and transmitted. Determine the minimum bandwidth required for each method if the multiplexing or modulating method used is (a) FDM, SSB (b) TDM, PAM 3. A speech signal has a total dutarion of 10 s. It is sampled at a rate of 8 kHz and then encoded. The signal-to-(quantization) noise ratio is required to be 40 dB. Calculate the minimum storage capacity needed to accomodate this digitized speech signal. 4. A PCM system uses a uniform quantizer followed by a 7- bit binary encoder. The

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tut4_problems - Department of Electrical Engineering EE 308...

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