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Spelling: QPSK

Quadrature Phase Shift Keying.

QPSK is a digital frequency modulation technique used for sending
data over networks of several media, including 802.11 wireless.

Doubling the data rate available in BPSK [1], via improved efficiency
in the use of the radio bandwidth, QPSK is used in 802.11b [2]
networks of 2Mpbs or greater.

* 802.11b Basics [3]

See also PHY [4].

Links:
------
[1] http://melbournewireless.org.au/?BPSK
[2] http://melbournewireless.org.au/?802.11b
[3] http://www.pulsewan.com/data101/802_11_b_basics.htm
[4] http://melbournewireless.org.au/?PHY

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