by admin | Jun 7, 2015 | sem3
QPSK Quadrature phase-shift keying (QPSK) Constellation diagram for QPSK with Gray coding. Each adjacent symbol only differs by one bit. Sometimes this is known as quadriphase PSK, 4-PSK, or 4-QAM. (Although the root concepts of QPSK and 4-QAM are different, the...
by admin | Jun 7, 2015 | sem3
BPSK BPSK (also sometimes called PRK, phase reversal keying, or 2 PSK) is the simplest form of phase shift keying (PSK). It uses two phases which are separated by 180° and so can also be termed 2-PSK. It does not particularly matter exactly where the constellation...
by admin | Jun 7, 2015 | sem3
Phase Shift Keying Phase shift keying (PSK) is a digital modulation scheme that conveys data by changing, or modulating, the phase of a reference signal (the carrier wave). Any digital modulation scheme uses a finite number of distinct signals to represent digital...
by admin | Jun 7, 2015 | sem3
Minimum Shift Keying In digital modulation, minimum-shift keying (MSK) is a type of continuous-phase frequency-shift keying that was developed in the late 1950s and 1960s.Similar to OQPSK, MSK is encoded with bits alternating between quadrature components, with the Q...
by admin | Jun 7, 2015 | sem3
Frequency Shift Keying Frequency-shift keying (FSK) is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier wave.The simplest FSK is binary FSK (BFSK). BFSK uses a pair of discrete frequencies to...
by admin | Jun 7, 2015 | sem3
Amplitude Shift Keying Amplitude-shift keying (ASK) is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave. In an ASK system, the binary symbol 1 is represented by transmitting a fixed-amplitude carrier wave and...
