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Binary Phase Shift Keying (BPSK) & Quadri Phase Shift Keying (QPSK)

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Binary Phase Shift Keying (BPSK) & Quadri Phase Shift Keying (QPSK). Binary Phase Shift Keying (BPSK). The BPSK signal is generated as: The transmitted signals are: - -. Illustration of BPSK. Note: Bits 1 and 0 have the same amplitude and frequency but they differ in phase.

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binary phase shift keying bpsk
Binary Phase Shift Keying (BPSK)
  • The BPSK signal is generated as:
  • The transmitted signals are:

-

-

illustration of bpsk
Illustration of BPSK

Note: Bits 1 and 0 have the same amplitude and frequency but they differ in phase.

frequency spectrum of bpsk signal
Frequency Spectrum of BPSK Signal

Note : The spectrum of the binary BSK resembles

that of double sideband suppressed carrier modulation.

bpsk demodulator
BPSK Demodulator
  • The detection of BPSK is achieved by:
  • XOR-gate
  • Low – pass filter ( LPF)
quadri phase shift keying qpsk
Quadri - Phase Shift Keying (QPSK)
  • In QPSK, the phase of the carrier takes on one of four equally spaced values such as π/4, 3π/4, 5π/4, 7π/4 or 0,π/2, π , 3π/4.
  • The transmitted signal is:
generation of qpsk signals
Generation of QPSK Signals

Signal space representation

- si(t) can be expressed as:

illustration of qpsk
Illustration of QPSK
  • Quadri means 4 messages are to be transmitted. Hence, 2 bits are needed to present each message
detection of qpsk
Detection of QPSK
  • Optimum Receiver:
m ary psk versus bpsk
M-ary PSK Versus BPSK
  • M-aryPSK requires more complexity in the

decision-making process.

  • M-ary PSK requires more transmitted power.
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