Binary phase shift keying bpsk quadri phase shift keying qpsk
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Binary Phase Shift Keying (BPSK) & Quadri Phase Shift Keying (QPSK) PowerPoint PPT Presentation


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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) & Quadri Phase Shift Keying (QPSK)

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Binary phase shift keying bpsk quadri phase shift keying qpsk

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


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:


Constellation diagram

Constellation Diagram


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:


Examples on m ary constellation diagrams

Examples on M-ary Constellation Diagrams


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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