Phase Shift Keying - definição. O que é Phase Shift Keying. Significado, conceito
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O que (quem) é Phase Shift Keying - definição

TYPE OF DATA ENCODING
Coherent differential phase-shift keying; Filtered symmetric differential phase-shift keying; Quadrature phase-shift keying; Phase shift keying; QPSK; OQPSK; Phase Shift Keying; Differential Phase Shift Keying; BPSK; Binary Phase Shift Keying; CDPSK; Biphase Shift Keying; Quadriphase; Quaternary phase-shift keying; 8-PSK; Quaternary phase shift keying; DPSK; Differential phase shift keying; DQPSK; Biphase modulation; Offset quadrature phase-shift keying; Offset QPSK; Staggered phase shift keying; Binary pase shift keying; 4PSK; 4-PSK; Staggered quadrature phase-shift keying; SQPSK; Phase Shift Modulation; 8 Phase Shift Keying; 8 phase shift keying; Differential phase-shift keying; Gaussian Phase Shift Keying; GPSK; DBPSK; Mpsk; 16psk; 32psk; 64psk; 128psk; 256psk; 512psk; 1024psk; 2psk; Offset psk; Opsk; HPSK; M PSK; Binary phase-shift keying; Quadrature Phase Shift Keying; 8PSK; SDPSK; Quatenary phase shift keying
  • Constellation diagram for 8-PSK with Gray coding
  • [[Constellation diagram]] example for BPSK
  • Timing diagram for DBPSK and DQPSK. The binary data stream is above the DBPSK signal. The individual bits of the DBPSK signal are grouped into pairs for the DQPSK signal, which only changes every ''T<sub>s</sub>'' = 2''T<sub>b</sub>''.
  • BER comparison between DBPSK, DQPSK and their non-differential forms using Gray coding and operating in white noise
  • BER comparison between BPSK and differentially encoded BPSK operating in white noise
  • Differential encoding/decoding system diagram
  • Timing diagram for offset-QPSK. The binary data stream is shown beneath the time axis. The two signal components with their bit assignments are shown the top and the total, combined signal at the bottom. Note the half-period offset between the two signal components.
  • Difference of the phase between QPSK and OQPSK
  • Bit-error rate curves for BPSK, QPSK, 8-PSK and 16-PSK, additive white Gaussian noise channel
  • Mutual information of PSK over the AWGN channel
  • Dual constellation diagram for π/4-QPSK. This shows the two separate constellations with identical Gray coding but rotated by 45° with respect to each other.
  • Timing diagram for π/4-QPSK. The binary data stream is shown beneath the time axis. The two signal components with their bit assignments are shown the top and the total, combined signal at the bottom. Note that successive symbols are taken alternately from the two constellations, starting with the "blue" one.
  • Signal doesn't pass through the origin, because only one bit of the symbol is changed at a time.
  • Constellation diagram for QPSK with [[Gray coding]]. Each adjacent symbol only differs by one bit.
  • Timing diagram for QPSK. The binary data stream is shown beneath the time axis. The two signal components with their bit assignments are shown at the top, and the total combined signal at the bottom. Note the abrupt changes in phase at some of the bit-period boundaries.
  • Receiver structure for QPSK. The matched filters can be replaced with correlators. Each detection device uses a reference threshold value to determine whether a 1 or 0 is detected.
  • Conceptual transmitter structure for QPSK. The binary data stream is split into the in-phase and quadrature-phase components. These are then separately modulated onto two orthogonal basis functions. In this implementation, two sinusoids are used. Afterwards, the two signals are superimposed, and the resulting signal is the QPSK signal. Note the use of polar [[non-return-to-zero]] encoding. These encoders can be placed before for binary data source, but have been placed after to illustrate the conceptual difference between digital and analog signals involved with digital modulation.

Amplitude and phase-shift keying         
16APSK; Asymmetric phase-shift keying; APSK
Amplitude and phase-shift keying (APSK) is a digital modulation scheme that conveys data by modulating both the amplitude and the phase of a carrier wave. In other words, it combines both amplitude-shift keying (ASK) and phase-shift keying (PSK).
Phase-shift keying         
Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency reference signal (the carrier wave). The modulation is accomplished by varying the sine and cosine inputs at a precise time.
BPSK         
Bi-Phase Shift Keying [Additional explanations: modulation] (Reference: HiperLAN/2, , 802.11a)

Wikipédia

Phase-shift keying

Phase-shift keying (PSK) is a digital modulation process which conveys data by changing (modulating) the phase of a constant frequency reference signal (the carrier wave). The modulation is accomplished by varying the sine and cosine inputs at a precise time. It is widely used for wireless LANs, RFID and Bluetooth communication.

Any digital modulation scheme uses a finite number of distinct signals to represent digital data. PSK uses a finite number of phases, each assigned a unique pattern of binary digits. Usually, each phase encodes an equal number of bits. Each pattern of bits forms the symbol that is represented by the particular phase. The demodulator, which is designed specifically for the symbol-set used by the modulator, determines the phase of the received signal and maps it back to the symbol it represents, thus recovering the original data. This requires the receiver to be able to compare the phase of the received signal to a reference signal – such a system is termed coherent (and referred to as CPSK).

CPSK requires a complicated demodulator, because it must extract the reference wave from the received signal and keep track of it, to compare each sample to. Alternatively, the phase shift of each symbol sent can be measured with respect to the phase of the previous symbol sent. Because the symbols are encoded in the difference in phase between successive samples, this is called differential phase-shift keying (DPSK). DPSK can be significantly simpler to implement than ordinary PSK, as it is a 'non-coherent' scheme, i.e. there is no need for the demodulator to keep track of a reference wave. A trade-off is that it has more demodulation errors.