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Synchronisation of line-coded digital PPM in repeatered transmission systems

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2 Author(s)
Wang Yichao, ; University College of North Wales, School of Electronic Engineering Science, Bangor, UK ; O'Reilly, J.J.

Line coding is shown to provide an effective means of controlling modulation jitter associated with digital pulse-position modulation (PPM), enabling simple phase-locked-loop (PLL) timing extraction circuits to be employed. The combination of a specific 9B2-32 code and a suitably designed third-order PLL with a maximally flat response is proposed and studied for the purpose of obtaining at dependent regenerators both frame and slot synchronisation signals. Jitter accumulation along a chain of such synchronisers is considered and shown to be acceptable, establishing that the combination of 9B2-32 line code and PLL synchroniser is well suited to repeatered digital PPM transmission.

Published in:

Communications, Radar and Signal Processing, IEE Proceedings F  (Volume:134 ,  Issue: 4 )

Date of Publication:

July 1987

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