Quiz_Chpt5_Q - EE3008 Principles of Communications: Quiz...

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EE3008 Principles of Communications : Quiz Questions for Chapter 5 1. Which one below is not a digital bandpass modulation technique? a). On-off ASK b). FSK c). AM d). BPSK 2. What is the best description of the spectrum of an on-off ASK signal? a). It has the same spectrum as the BPSK signal. b). It has a very large component at carrier frequency. c). It has the same spectrum as a rectangular pulse. d). It is a sinc function. 3. Which one is the best regarding power efficiency? a). BPSK b). Binary DPSK c). Binary FSK d). On-off ASK 4. What is the right description of on-off ASK? a). It requires strict synchronization requirement. b). It is equivalent to multiplying a bipolar baseband signal by a cosine signal. c). It requires more power to achieve the same performance as BPSK. d). Its spectrum is a sinc function. 5. Which one is the best regarding both power efficiency and spectral efficiency? a). BPSK b). Binary DPSK c). QPSK d). On-off ASK 6. Which one is a wrong description of binary DPSK? a). DPSK has higher BER v.s. SNR than BPSK. b). It must use coherent detection method. c). It can work without very accurate phase information at the receiver. d). It carries information using the phase difference between adjacent symbols. 7. How many information bits are carried by each symbol in the 8PSK modulation scheme? a). 1 bit b). 2 bits c). 3 bits d). 4 bits 8. Suppose the input data for a binary DPSK modulation system is 110001, which one below is the transmitted sequence (including an initial bit of 1)? a). 1110100
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Quiz_Chpt5_Q - EE3008 Principles of Communications: Quiz...

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