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phase modulation |
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phase modulation: see modulation modulation, in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulating wave); demodulation is the process by which the original signal is recovered from ..... Click the link for more information. . Varying the angle of a wave in a carrier in order to transmit analog or digital data. For digital signals, phase modulation (PM) is widely used in conjunction with amplitude modulation (AM). For example, quadrature amplitude modulation (QAM) uses both phase and amplitude modulation to create different binary states for transmission (see QAM). See modulation and carrier.
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DQPSK is a phase modulation format with four phase states. Electronic phase modulation of this kind will work well with fairly long-term processes, but electronic carrier waves have fairly low frequencies. It offers best-in-class amplitude and phase modulation performance, which provides a handset with fast calibration time. |
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