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Spelling: QPSK
Quadrature Phase Shift Keying.
QPSK is a digital frequency modulation technique used for sending
data over coaxial cable networks. Since it's both easy to implement
and fairly resistant to noise, QPSK is used primarily for sending data
from the cable subscriber upstream to the Internet.
See also: 64QAM, BPSK [1], DQPSK, CDMA, S-CDMA, VSB
(Thanks to cnet.com)
Links:
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[1] http://melbournewireless.org.au/?BPSK
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