quarternary phase-shift keying

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quarternary phase-shift keying [′kwät·ə‚ner·ē ′fāz ‚shift ‚kē·iŋ]

(electronics)

Modulation of a microwave carrier with two parallel streams of nonreturn-to-zero data in such a way that the data is transmitted as 90° phase shifts of the carrier; this gives twice the message channel capacity of binary phase-shift keying in the same bandwidth. Abbreviated QPSK.

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