| DQPSK
DQPSK is a digital modulation technique commonly used with cellular
systems. Motorola's CyberSurfr cable modem uses DQPSK to carry data
upstream from the subscriber's computer to the Internet on a narrower
frequency band than standard QPSK. Narrower bands allow more upstream
channels, so the CyberSurfr has additional noise-free channels to choose
from when it's installed. |