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See Quadrature Amplitude Modulation (QAM).
See Quadrature Phase Shift Keying (QPSK).
This is method that is used to combine two amplitude-modulated (AM) signals into a single channel, thereby doubling the effective bandwidth.
This is a modulation technique whereby a RF carrier is modulated via phase shifting, usually at 0, 90, 180, and 270 degrees. Basically, a digital data stream is taken two bits at a time to generate one of four possible phase states of the transmitted carrier. Also known as Quaternary Phase Shift Keying.
This term refers to a guarantee of a network's speed and performance. A QoS measurement should reflect the network's transmission quality and service availability. QoS can come in the form of traffic policy in which the transmission rates are limited; thereby guaranteeing a certain amount of bandwidth will be available to applications. Or QoS may take the form of traffic shaping, which are techniques to reserve bandwidth for applications but not to guarantee its availability.
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