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Hardware Implementation Of QPSK Modulator for Satellite Communications
- 1. Hardware Implementation of QPSK Modulator for Satellite Communication Presented By : Kiran Prajapati Pradeep Santdasani Internal Guide : Dhara Shah Lecturer (EC Dept.) L C Institute of Tech . External Guide : E P Balasubramanian Group Director SPSG Space Application Center (ISRO)
- 6. QPSK Modulator I data Q data + Cos ω c t Modulator Output Block Diagram sin ω c t I - Signal 1 bit = 180 o 0 bit = 0 o 0 bit = 90 o 00 bit = 45 o 10 bit = 315 o 01 bit =135 o 11 bit = 225 o Q - Signal 1 bit = 270 o Constellation Description of QPSK Modulator June 9, 2009
- 7. QPSK Modulator Equations I - Signal sin ( ω c t - 45 ) Q - Signal -cos ω c t Phasor Diagram +cos ω c t +sin ω c t -sin ω c t sin ( ω c t - 135 ) sin ( ω c t + 45 ) sin ( ω c t + 135 ) Description of QPSK Modulator June 9, 2009 I Data Q data I Mod O/P Q Mod O/P QPSK O/P QPSK O/P Phase 0 0 sin ω c t cos ω c t sin ω c t + cos ω c t = sin ( w c t + 45 ) 45˚ 0 1 sin ω c t -cos ω c t sin ω c t - cos ω c t = sin ( ω c t + 135) 135˚ 1 0 - sin ω c t cos ω c t - sin ω c t + cos ω c t = sin ( ω c t - 45 ) 315˚ 1 1 - sin ω c t -cos ω c t - sin ω c t - cos ω c t = sin ( ω c t - 135 ) 225˚
- 8. QPSK Modulator Time Domain Description of QPSK Modulator June 9, 2009
- 10. QPSK Modulator Unipolar to Bipolar Upsampling Carrier Unipolar to Bipolar Upsampling 90 o I data Q data Multiplier Multiplier Adder QPSK Modulator Block Diagram Matlab Simulation of QPSK Modulator June 9, 2009
- 11. QPSK Modulator Upsampling Matlab Simulation of QPSK Modulator June 9, 2009
- 12. QPSK Modulator I - Signal Modulation Matlab Simulation of QPSK Modulator June 9, 2009
- 13. QPSK Modulator Q Signal Modulation Matlab Simulation of QPSK Modulator June 9, 2009
- 14. QPSK Modulator QPSK Time Domain Signal Matlab Simulation of QPSK Modulator June 9, 2009
- 15. QPSK Modulator Baseband Spectrum Matlab Simulation of QPSK Modulator June 9, 2009
- 16. QPSK Modulator QPSK Spectrum Matlab Simulation of QPSK Modulator June 9, 2009
- 18. QPSK Modulator Unipolar to Bipolar Upsampling Carrier Unipolar to Bipolar Upsampling 90 o I data Q data Shaping Shaping Multiplier Multiplier Adder QPSK Modulator Block Diagram Matlab Simulation of QPSK Modulator June 9, 2009
- 19. QPSK Modulator QPSK Spectrum Matlab Simulation of QPSK Modulator June 9, 2009
- 20. QPSK Modulator Carrier Frequency ƒc = 25 MHz Data Frequency ƒd = 25 MHz Roll off Factor α = 0.3 Bandwidth = 16.25 MHz Matlab Simulation of QPSK Modulator QPSK Bandwidth June 9, 2009
- 25. QPSK Modulator I data + Look Up Table sinw c t I Carrier Q Carrier Shaping filter Unipolar to bipolar Shaping filter Unipolar to bipolar Q data QPSK Modulated Signal Look Up Table cosw c t QPSK Modulator Block Diagram Hardware Implementation of QPSK Modulator June 9, 2009
- 27. QPSK Modulator I & Q Carrier Signal Generation Hardware Implementation of QPSK Modulator June 9, 2009
- 28. QPSK Modulator Simulated Implemented QPSK Modulated Signal Hardware Implementation of QPSK Modulator June 9, 2009
- 29. QPSK Modulator QPSK Spectrum Hardware Implementation of QPSK Modulator June 9, 2009
- 30. QPSK Modulator Simulated Implemented QPSK Spectrum : Results June 9, 2009
- 31. QPSK Modulator Hardware Setup : Results June 9, 2009
- 35. Thanks
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- We are doing project in space application centre(isro) at ahmedabad. Our project is QPSK modulator QPSK Modulator