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Proceedings Paper

GMSK co-channel demodulation
Author(s): D. J. Nelson; J. R. Hopkins
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Paper Abstract

Gaussian Minimum Shift Keying (GMSK) is a modulation method used by GSM phone networks and the Automatic Identification System (AIS) used by commercial ships. Typically these systems transmit data in short bursts and accomodate a large number of users by time, frequency and power management. Co-channel interference is not a problem unless the system is heavily loaded. This system load is a function of the density of users and the footprint of the receiver. We consider the problem of demodulation of burst GMSK signals in the presence of severe noise and co-channel interference. We further examine the problem of signal detection and blind estimation and tracking of all of the parameters required in the demodulation process. These parameters include carrier frequency, carrier phase, baud rate, baud phase, modulation index and the start and duration of the signal.

Paper Details

Date Published: 3 September 2009
PDF: 11 pages
Proc. SPIE 7444, Mathematics for Signal and Information Processing, 74440V (3 September 2009); doi: 10.1117/12.825196
Show Author Affiliations
D. J. Nelson, National Security Agency (United States)
J. R. Hopkins, National Security Agency (United States)

Published in SPIE Proceedings Vol. 7444:
Mathematics for Signal and Information Processing
Franklin T. Luk; Mark S. Schmalz; Gerhard X. Ritter; Junior Barrera; Jaakko T. Astola, Editor(s)

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