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Practical measurements on a digital PPM system handling 8Mbit/s PCM data show good correlation with theoretical results obtained from a computer model of the system. It is confirmed that there exists an optimum number of time slots which maximises the receiver sensitivity, and that a digital PPM system can offer an improvement of 4.2 dB over an equivalent binary PCM system when the fibre bandwidth is several times that required by PCM.
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Calvert et al. (1988) studied this question.
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