561_hmk4 - bandwidth required for no ISI and a rolloff...

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ECE 561 – Digital Communications Systems Homework #4 1. An analog signal is sampled, quantized, and transmitted over a channel with a maximum bandwidth of 100 KHz using binary PCM. a. If a rolloff factor of r = 0.6 is used, what is the maximum data rate in bits/sec? b. If the samples are quantized at 32 level, what is the maximum sampling rate of the analog signal? c. What is the maximum analog bandwidth that can be accommodated with this sample rate? d. Repeat parts b and c if 8-ary PAM waveforms are used. 2. A voice signal is sampled at 8000 samples/second. a. If we transmit these samples directly as PAM pulses (non-quantized), what is the
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Unformatted text preview: bandwidth required for no ISI and a rolloff factor of r = 1? b. Repeat part a if binary PCM is used and the samples are quantized to eight levels. c. Repeat part b for 128 quantization levels. 3. What is the theoretical minimum bandwidth required to transmit a 10Kbps binary PCM waveform? How large can the rolloff factor, r, be if the allowable bandwidth is 6 KHz? 4. The binary sequence: 1 0 0 1 0 1 1 0 0 1 0 is input to a duobinary modulator with precoding. Complete the table shown below. Data sequence, x k 1 0 0 1 0 1 1 0 0 1 0 Precoded seq. w k Trans. bipolar seq, w k Received seq, y k Decoded output...
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