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 data. PSK uses a finite number of phases, each assigned a unique pattern of binary digits. Usually, eac...
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http://en.wikipedia.org/wiki/Phase-shift_keying
(from the article `telecommunication`) When phase is the parameter altered by the information signal, the method is called phase-shift keying (PSK). In the simplest form of PSK, as ... ...methods to do this. The most important are frequency-shift keying (FSK), in which the carrier wave is shifted between two established frequencies, ......
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http://www.britannica.com/eb/a-z/p/54
angle modulation in which each significant condition in a discretely timed modulating signal is represented by a specified difference between the phase of the modulated signal and the phase of the carrier in the absence of modulation
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-06-40
see PSK.
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http://www.encyclo.co.uk/visitor-contributions.php
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