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EE450-SampleII-Nazarian-Summer11

# EE450-SampleII-Nazarian-Summer11 - EE450 Sample Exam II...

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EE450 Sample Exam II Nazarian Student ID: _______________ Name: ____________________ Total Time: 65 minutes Score: /90 IMPORTANT: SHOW YOUR WORK. 1) TDM (Time Division Multiplexing) (27 points) Neda, a Physical layer designer at Motorola, designs a simple synchronous TDM Mux, which reads 5 bits of data from each input at a time. There are 250 input channels, however in average, only 10% of the inputs are active at a time. Each active input can generate data at a rate of 0.8Kbps. Neda considers 10 framing bits to be added to each output frame by the TDM process. a) (8 pts) Each input channel is originally analog with baseband frequency of 10Hz to 50Hz. Neda implements an A/D converter [Sampler+Quantizer+Encoder] for each input channel to transform the analog signal to digital before applying TDM on the channels. What is the sampling rate? and the rate at the of output the Quantizer? How many quantization levels the A/D must have? b) (4 pts) What is the length of each TDM frame at the output of the Mux? c) (6 pts) Calculate the output frame rate? d) (4 pts) What is the output rate in Mbps? e) (2 pts) Considering the overhead calculate the efficiency of this TDM.

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EE450-SampleII-Nazarian-Summer11 - EE450 Sample Exam II...

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