Demodulation method and demodulator for CPFSK-modulated signals

Details Demodulation method and demodulator for CPFSK-modulated signals Demodulation method and demodulator for CPFSK-modulated signals

2006-01-31

2006-01-31

Ghebretinsae, Temesghen (Department: 2637)

Pulse or digital communications

Receivers

Angle modulation

C375S272000, C375S341000, C329S300000

Reexamination Certificate

active

06993097

ABSTRACT:
In a method for estimating a sequence of input data symbols of a CPFSK-modulated data signal transmitted via a faulty channel, in the course of an ACS operation for calculating a transition metric value, an estimated value is determined for the replacement symbol occurring during the linear approximation of the CPFSK. That estimated value is considered in calculating the transition metric value.

REFERENCES:
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patent: 6785348 (2004-08-01), Hammes et al.
Pierre A. Laurent: “Exact and Approximate Construction of Digital Phase Modulations by Superposition of Amplitude Modulated Pulses (AMP)”, IEEE Transactions on Communications, vol. Com-34, No. 2, Feb. 1986, pp. 150-160.
K.D. Kammeyer.: Nachrichtenübertragung (message transmission), published by G. Teubner Verlag, 1996, Chapter 12.1.5, “Coherent Demodulation of CPM Signals” pp. 422 and 423.
Colavolpe, G. et al.: “Noncoherent Sequence Detection of CPM”, Electronics Letters, vol. 34, No. 3, Feb. 5, 1998, pp 259-261.
Baier, A.: “Derotation Techniques In Receivers For MSK-Type CPM Signals”, Elsevier Science Publishers B.V., Bd. 3, Sep. 18, 1990, pp. 1799-1802.

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