13.06.2020_EC8652 WC_UNIT 3_MCQ TEST

1.Bit error rate provides the information about the type of error.

• true
• false

2. MSK is a special type of continuous phase frequency shift keying where the peak frequency deviation is___________ of bit rate.

• ¼th
• twice
• half
• 3/4th

3.In MSK the _________________________ are used instead of rectangular pulses.

• train of impulses
• half sinusoidal pulse
• triangular
• square

4._____________ signalling is also referred as a fast frequency shift keying.

• BPSK
• QPSK
• MSK
• BFSK

5.The ____________________ is used to smooth the phase trajectory of MSK signal and stabilize the frequency variation over time.

• Gaussian pulse shaping filter
• High pass filter
• Pyrwits filter
• Median FIlter

6. ________________ is used to avoid the ISI in GMSK

• Correlative level coding
• Precoding
• Ensemble coding
• Statisical Filtering

7. The MSK signal have continuous phase in all cases where as QPSK signal has abrupt phase shift of π/2 or π.

• true
• false

8.For the same bit error rate the bandwidth required for QPSK is reduced to half as compared to BPSK.

• true
• false

9. _____________________ refers to the prefixing of a symbol with a repetition at the end of frame.

• Cyclic prefix
• Automatic repeat request
• Additive noise filtering
• Synchronous prefixing

10. Out-of-band emissions in a communication system in the RF domain are eliminated by

• Transmit and Receive filters
• Modems
• codecs
• antenna drivers