Coherent demodulation of hopped MSK waveforms system and method

Details Coherent demodulation of hopped MSK waveforms system and method Coherent demodulation of hopped MSK waveforms system and method

2007-07-03

2007-07-03

Tran, Khai (Department: 2611)

Pulse or digital communications

Spread spectrum

Frequency hopping

Reexamination Certificate

active

10437564

ABSTRACT:
A method of demodulating a frequency hopped waveform is disclosed. The method comprises receiving an analog radio frequency signal, converting the analog signal to a digital pulse signal, and determining the I and Q bits in the digital pulse signal. The method also comprises derotating the Q bits by a ninety (90) degree phase shift. The method further comprises deriving an approximate phase angle for the pulse from the I and derotated Q bits.

REFERENCES:
patent: 5659574 (1997-08-01), Durrant et al.
patent: 5953370 (1999-09-01), Durrant et al.
patent: 2002/0196860 (2002-12-01), Ohtaki

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