PSM meaning in Computing ?

Answer: What is Phase Shift Modulation mean?

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.

reference

Full Form	Category
Professional Science Masters	Academic & Science
Professional Science Master	Academic & Science
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Paid Search Marketing	Business
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Psalms	Community
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Play Station Magazine	Community
Protective Security Manual	Computing
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Protection Switch Module	Computing
Picture Status Memory	Computing
Platform Specific Module	Computing
Print Station Manager	Computing
Persistent Storage Manager	Computing
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Platform Support Module	Computing
Pascal Symbol	Computing
Perspective Shadow Mapping	Computing
Position Switching Module	Computing
Premium Support Manager	Computing
Personal Storage Module	Computing
Phase Shift Modulation	Computing
Packet Storage Manager	Computing
Privileged Session Manager	Computing
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Protocol Security Manager	Computing
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Power Side Mirrors	General
Parking Space Measurement	General
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Parking Slot Measurement	General
Prescribed Structural Motion	General
Porsche Stability Module	General
Power Sounder Module	General
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Power Seat Memory	General
Programmable Special Module	General
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Personnel Status Monitor	Military and Defence
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Persistent Stored Module	Networking
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Propellant Storage Module	Space Science
Pyro Substitute Monitor	Space Science
Priority Select Module	Space Science
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