Review Questions for Chapter 5 Calculate the baud rate for the given bit rate and type of modulation a) 2000bps, FSK b) 4000bps, ASK c) 6000bps, QPSK d) 36000bps, 64-QAM Calculate the bit rate for the given baud rate and type of modulation a) 1000baud, FSK b) 1000baud, ASK c) 1000baud, BPSK d) 1000baud, 16-QAM What is the number of bits per baud for the following techniques a) ASK with four different amplitudes b) FSK with eight different frequencies c) PSK with four different phases d) QAM with a constellation of 128 points Review Questions for Chapter 5 How many bits per baud can we send in each of the following cases if the signal constellation has the following number of points? a) 2 b) 4 c) 16 d) 1024
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Question 1 [20 marks] Short questions [2 marks] One advantage of non-coherent demodulation over coherent demodulation, is that the demodulator does not need to implement phase estimation. (TRUE or FALSE) [2 marks] PSK is a special case of QAM. (TRUE or FALSE) [2 marks] The internet uses only radio frequency signals to send data. (TRUE or FALSE) [2 marks] Modern electronic communications has made little impact to our day-to-day lives. (TRUE or FALSE) [2 marks] What is meant by PCM? How is data transmitted using cell phones? [2 marks] What is the disadvantages of ASK, FSK and PSK? [2 marks] Define the term ISI. [2 marks] An analog signal has a bit rate of 9000 bps and a baud rate of 1000 baud. How many data elements are carried by each signal element? How many signal elements do we need? [2 marks] State NRZ unipolar format
Problem 4 Given the analog voice signal shown below. If the signal is sampled once per millisecond time interval (starting at 0): (a) What would be the bit stream sent if PCM encoding was being used to send the data? (b) What is the data rate of the resulting digital signal? (c) What is the required S/N ratio (in DB) to transmit the signal over a 4 kHz medium?
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