Acquistion sequences in PPM communications

Authors:
R. Gagliardi;J. Robbins;H. Taylor
Affiliations:
Univ. of Southern California, Los Angeles;Bell Communications Research Corporation, Morristown, NJ;Univ. of Southern California, Los Angeles
Venue:
IEEE Transactions on Information Theory
Year:
1987

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Abstract

In pulse position modulation (PPM) communications an acquisition sequence is needed to establish frame synchronization for subsequent data transmission. This sequence must have PPM structure (one pulse per frame) and desirable autocorrelation properties for its detection. The problem of finding aperiodic PPM acquisition sequences having the minimum possible autocorrelation for all off-shifted positions is investigated. Sequences with the maximum possible number of frames have been found up to frame size15. Examples are given for every frame length up to88, and powers of two up to1024. An interesting relation between the PPM sequence problem, Costas and sonar arrays, and Golomb's ruler is explored.