Pulse-amplitude modulation PAM , is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. It is an analog pulse modulation scheme in which the amplitudes of a train of carrier pulses are varied according to the sample value of the message signal. Demodulation is performed by detecting the amplitude level of the carrier at every single period.
Pulse-amplitude modulation is widely used in modulating signal transmission of digital data, with non- baseband applications having been largely replaced by pulse-code modulation , and, more recently, by pulse-position modulation.
QAM uses a two-dimensional constellation. The number of possible pulse amplitudes in analog PAM is theoretically infinite. Digital PAM reduces the number of pulse amplitudes to some power of two.
Some versions of the Ethernet communication standard are an example of PAM usage. The concept is also used for the study of photosynthesis using a specialized instrument that involves a spectrofluorometric measurement of the kinetics of fluorescence rise and decay in the light-harvesting antenna of thylakoid membranes, thus querying various aspects of the state of the photosystems under different environmental conditions. Pulse-amplitude modulation has also been developed for the control of light-emitting diodes LEDs , especially for lighting applications.
Pulse Amplitude Modulation
Pulse-amplitude modulation LED drivers are able to synchronize pulses across multiple LED channels to enable perfect colour matching. Due to the inherent nature of PAM in conjunction with the rapid switching speed of LEDs it is possible to use LED lighting as a means of wireless data transmission at high speed.
After accounting for error correcting codes and other overhead, the data rate in the signal is From Wikipedia, the free encyclopedia. Form of signal modulation where information is encoded in the amplitude of a series of pulses.
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Advances in Photosynthesis and Respiration. Dordrecht: Springer Netherlands. LED Lights [ permanent dead link ] Magazine.
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Pulse Amplitude Modulation
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