Digital Communication

2. It is the non-coherent version of PSK.
3. A system for translating logic ones and zeros into voltage or current levels for transmission is called ______ codes.
5. The deviation in _______ frequency is called as Bandwidth.
7. It is the process of correcting channel induced distortion.
9. It is used to allow amplitude limiting in the receivers.
13. Large _______ is the biggest disadvantage of PCM.
15. ___________ carriers are used for M-ary PSK and QASK.
18. It is the process by which analog signal is converted to a sequence of uniformly distributed signal in space.
19. The ratio of message bits and the encoder output bits is known as code ____.
20. It is used to reduce the aperture effect in flat top pulses.

1. It is the process by which some characteristics of a carrier is varied in accordance with a modulating signal.
4. The SNR ratio in PCM depends on quantization ________.
6. A narrow sample produced at the pulse demodulator output is distributed to appropriate low pass reconstruction filter by means of this process.
8. __________ noise can be introduced anywhere between the transmitter output and receiver input.
10. Channel data rate is the bit rate at the output of _______.
11. This encoder adds bits to the message signal.
12. The encoded block of 'n' bits is known as ________.
14. It is the phenomenon by which high frequency components takes the identity of low frequency components.
16. A physically ________ system is an optimum system.
17. A practical way of studying Inter Symbol Interference is ___ pattern.