Why QPSK is called quadrature shift keying?

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Tags

  1. #channels
  2. #modulating
  3. #binary
  4. #system
  5. #phase
  6. #signals
  7. #quadrature
  8. #digital
  9. #signal
  10. #states
  11. #radio
  12. #using
  13. #degree
  14. #frequency
  15. #quadriphase
  16. #shift
  17. #carrier
  18. #offset
  19. #degrees
  20. #keying