The quadrature phase channel in a phase shift keyed system having more that 2 phase states.
QAM
Quadrature Amplitude Modulation
QCIF
Quarter CIF (1/4 CIF). A video image format which employs 176 horizontal pixels and 144 vertical lines.
Although resolution is courser than CIF, QCIF consumes less memory while still achieving an acceptable level of clarity on small displays such as those incorporated in mobile phones.
QoS
quality of service
A measure of the quality of the signal transmitted over the RF channel. In some systems, the QoS measurement is used to dynamically adjust operational parameters such as transmitter power levels and coding rates.
