Minimum Shift Keying Detection Algorithm

Gerald F. Sage

Abstract:	Minimum shift keying is used in the USCG medium frequency GPS differential correction system. This paper describes algorithms for parameter tracking and data detection. The performance of the optimum receiver in Gaussian noise is used as a criterion for technique evaluation. Following the structure of the optimum receiver, the detector form is developed. Nonlinear processing is introduced before the detector to reduce the effects of impulsive noise found in the medium frequency band. Implementation of the detector requires phase and bit time tracking by the receiver. Dual Costas tracking loops are use to track the bit frequencies. The bit time is tracked by observing the relative phase of the bit frequencies. The result is a system with robust acquisition and only a modest loss of sensitivity. A signal tracking monitor determines if the signal is being reliably tracked, which, when combined with the signal coding, provides protection against undetected errors.
Published in:	Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993) June 21 - 23, 1993 Royal Sonesta Hotel Cambridge, MA
Pages:	681 - 688
Cite this article:	Sage, Gerald F., "Minimum Shift Keying Detection Algorithm," Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993), Cambridge, MA, June 1993, pp. 681-688.
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