PSK

Short for phase-shift keying, a modulation technique used by modems in which different phase angles in the carrier signal are used to represent the binary states of 0 and 1.

The simplest method of PSK, also called biphase modulation, uses two signal phases – 0 degrees and 180 degrees. The digital signal is broken up according to time into binary digits and the state (1 or 0) of each bit is determined according the state of the bit that preceded it. If the phase of the bit does not change then the state of the signals stays the same. If the phase of the signal changes by 180 degrees, then the signal state changes (from 0 to 1, or 1 to 0).

There are more complex forms of PSK that rely on four or eight phases to transmit data at a faster rate.

Compare with FSK.

Webopedia Staff
Webopedia Staff
Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page.

Related Articles

Human Resources Management System

A Human Resources Management System (HRMS) is a software application that supports many functions of a company's Human Resources department, including benefits administration, payroll,...

How To Defend Yourself Against Identity Theft

Almost every worldwide government agency responsible for identity theft issues will tell you the same thing: The first step to fighting identity theft is...

Infographic

An infographic is a visual representation of information or data. It combines the words information and graphic and includes a collection of imagery, charts,...

Phishing

What is phishing? Phishing is a type of cybercrime in which victims are contacted by email, telephone, or text message by an attacker posing as...

ScalaHosting

ScalaHosting is a leading managed hosting provider that offers secure, scalable, and affordable...

HRIS

Human resources information system (HRIS) solutions help businesses manage multiple facets of their...

Best Managed Service Providers...

In today's business world, managed services are more critical than ever. They can...