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Pulse-position modulation is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of 2 M {\displaystyle 2^{M}} possible required time shifts. This is repeated every T seconds, such that the transmitted bit rate is M / T {\displaystyle M/T} bits per second. It is primarily useful for optical communications systems, which tend to have little or no multipath interference.
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