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NIELIT 2022 April Scientist B | Section B | Question: 119

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In a binary data transmission $\text{DPSK}$ is preferred to $\text{PSK}$ because : 

  1. a coherent carrier is not required to be generated at the receiver
  2. for a given energy per bit, the probability of error is less
  3. the $1800$ phase shifts of the carrier are unimportant
  4. more protection is provided against impulse noise
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A)    A coherent carrier is not required to be generated at the receiver  …..

 

It stands for Differential phase-shift keying. It does not need a synchronous (coherent) carrier at the demodulation. The input sequence of the binary bit is modified such that the next bit depends upon the previous bit. Therefore in the receiver previous received bits are used to detect the present bit …..

 

 

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