Zener Diode Experiment, Physics instrument, Educational Scientific Instruments

Quadrature Amplitude (QAM) Modulation & Demodulation


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Quadrature Amplitude (QAM) Modulation & Demodulation

Quadrature Amplitude (QAM) Modulation & Demodulation

Technical Specifications:

Carrier Sine Wave Generator:

  • Four carrier sine waves Generated onboard.
  • Provides synchronized Sine waveform output of 500 KHz (0 deg.),500 KHz (90 deg.), 500 KHz (180 deg.), 500 KHz (270 deg.)

Clock And Data Generator:

  •  24 bit variable NRZ-L pattern generated depending on the position of the three nos. of 8- Bit Data Switch provided
  •  Clock Frequency is of 250 KHz

Data Format (Coding):

  • Non Return to Zero-Level (NRZ-L). 
  • Tribit encoded data (I ,Q & C).
  • Differential Encoded I & Q Bits

Carrier Modulation Techniques:

  • Quadrature Amplitude Modulation.
  • Differentially Quadrature Amplitude Modulation

Carrier Demodulation Techniques: 

  • Quadrature Amplitude Demodulation.
  • Differentially Quadrature Amplitude Demodulation

On-board Features: 

  • On board Three Nos. of 8 bit variable NRZ-L pattern Data Simulator 
  • Switch Faults are provided on board to study different effects on circuit 
  • QAM/DQAM Demodulation using PLL and Envelop detectors 
  • Switch Faults are provided on board to study different effects on circuit Interconnections : 4 mm sockets
  • Test Points: 32 Aprrox
  • Power: 230V 10% 50 Hz, 1 AC

Accessories:

  •  Detailed Instruction Manual.
  •  Set of Patch cords

 

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Experiment

EXPERIMENTS

  • To study tribit data coding technique of NRZ-L data
  • To study the differential encoding of tribit data
       a) To study and observe constellation diagram
       b) To study bandwidth efficiency of QAM
  • To study quadrature amplitude modulation(QAM) technique
  • To study differential quadrature amplitude modulation (DQAM) technique