10.32. Consider an ideal system and an 8-bit PCM/PSK system operating with (S/N) 40 dB. Assume that the ideal system uses the same bandwidth as the PCM system. With 7/2 10- watt/Hz and f. = 15 kHz, find the signal ...
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10.31. Suppose that black and white still pictures from the moon were digitized using (25)(10) samples per picture (500 x 500 array) and transmitted to the earth using 8-bit PCM/PSK. Assume that 10 minutes are allotted for the transmission of ...
10.30. A video signal having a bandwidth of 6 MHz is to be transmitted from the moon using 8-bit PCM/PSK. The thermal noise power spectral density at the receiving antenna is /2 = 10 watt/Hz. Assuming a power loss of ...
10.29. What is the minimum bandwidth expansion ratio required to obtain (S/N) =60 dB with (SIN), = 20 dB?
10.28. Is it possible to design a communication system to yield (S/N). = 60 dB., with (S/N), = 20 dB, and B’ = 4?
10.27. A number of 20 kHz channels are to be time-division multiplexed and transmitted using PAM. The sampling pulses are 4 sec in width. The TDM pulse train is passed through a lowpass filter with a time constant RC = ...
10.26. Twenty-four analog signals, each having a bandwidth of 15 kHz, are to be time-division multiplexed and transmitted via PAM/AM. A guard band of S kHz is required for signal reconstruction from the PAM samples of each signal. (a) Determine ...
10.25. Eight input signals are sampled and time multiplexed using PAM. The time multiplexed signal is passed through a lowpass filter before transmission. Six of the input signals have a bandwidth of 4 kHz and the other two are bandlimited to ...
10.24. Two lowpass signals of equal bandwidth are impulse sampled and time multiplexed using PAM. The TDM signal is passed through a lowpass filter and then transmitted over a channel with a bandwidth of 10 kHz. (a) What is the maximum ...
10.23. Plot (So/N,)DM and (S/N,)PcM versus B7 for equal transmission bandwidths B7 =4f. to 32f. Assume f = 3000 Hz and fi = 300 Hz.