DPSK.pptx

DPSK.pptx

• 1.
  DPSK Presented By –Ashish Ranjan M.Tech (ECE) 1st Year Roll No-22904004 National Institute of Technology Jalandhar
• 2.
  What is DPSK? •Differential phase shift keying (DPSK) is a common type of phase modulation that conveys data by changing the phase of the carrier wave. • In DPSK the phase of the modulated signal is shifted relative to the previous signal element. The signal phase follows the high or low state of the previous element.
• 3.
  DPSK Transmitter A balancedmodulator is a device that modifies a signal, usually in the form of an amplitude modulated (AM) radio signal. It takes the original signal that has both sidebands and a carrier signal, and then modulates it so that only the sideband signals come through the output modulator. This creates a balanced signal, as there is less noise because the carrier signal has been removed.
• 4.
  Generation Of DPSKSignal • If symbol bit is 0 then there is a transition in a binary sequence. • If symbol bit is 1 then there is no transition in a binary sequence.  Let’s take an example and draw the waveform for it- Digital bit -10110010 https://youtu.be/KNRYO-mbf0Y
• 5.
  STEPS 1. Draw polarNRZ encoding of the given binary sequence. 2. Two cases are there for active high(1), and for active low(0). 3. After that find the phases of the sequence for 1 it is 0, and for 0 it is π 1. Then shift bit by one position phase 2. Repeat step 3 3. Then we receive the output i.e. received signal.
• 6.
  DPSK Receiver For DPSKreceiver there are two cases :  CASE 1: Same polarity of input and delayed signal.  CASE 2: Opposite polarity of input and delayed signal.
• 7.
  Numerical https://youtu.be/PAqWflbx8Z8
• 8.
  Benefit and Drawback •Advantage : DPSK modulation does not require carrier at its receiver circuit. Hence complex circuits are not needed. • Disadvantage : a) Probability of error or BER (Bit Error Rate) is higher in DPSK compare to BPSK. b) Noise interference in DPSK is more. c) DPSK modulation uses two successive bits for its reception. Hence error in first bit creates error in second bit and consecutively error propagates. https://www.rfwireless-world.com/Terminology/Advantages-and-Disadvantages-of-DPSK-modulation.html
• 9.
  Thank You