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Published September 2013 | Submitted
Journal Article Open

Self-Synchronizing Pulse Position Modulation With Error Tolerance

Abstract

Pulse position modulation (PPM) is a popular signal modulation technique which converts signals into M-ary data by means of the position of a pulse within a time interval. While PPM and its variations have great advantages in many contexts, this type of modulation is vulnerable to loss of synchronization, potentially causing a severe error floor or throughput penalty even when little or no noise is assumed. Another disadvantage is that this type of modulation typically offers no error correction mechanism on its own, making them sensitive to intersymbol interference and environmental noise. In this paper, we propose a coding theoretic variation of PPM that allows for significantly more efficient symbol and frame synchronization as well as strong error correction. The proposed scheme can be divided into a synchronization layer and a modulation layer. This makes our technique compatible with major existing techniques such as standard PPM, multipulse PPM, and expurgated PPM as well in that the scheme can be realized by adding a simple synchronization layer to one of these standard techniques. We also develop a generalization of expurgated PPM suited for the modulation layer of the proposed self-synchronizing modulation scheme. This generalized PPM can also be used as stand-alone error-correcting PPM with a larger number of available symbols.

Additional Information

© 2013 IEEE. Manuscript received January 15, 2013; revised May 02, 2013; accepted May 04, 2013. Date of publication May 07, 2013; date of current version August 14, 2013. This work was supported by the Japan Society of Promotion of Science. Communicated by R. F. Fischer, Associate Editor for Communications. The author thanks the three anonymous reviewers and Associate Editor R. Fischer for their careful reading of the manuscript and constructive suggestions.

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August 19, 2023
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