Communication device with efficient multi-level digital demodula

Demodulators – Frequency shift keying or minimum shift keying demodulator – Input signal combined with local oscillator or carrier...

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375324, 375334, H03D 300, H04L 2714

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active

054537150

ABSTRACT:
A communication device (100) includes mixers (104) and (108) which mix a local oscillator (112, 106) with a received signal to produce in-phase (i) and quadrature (q) components. The direction of the phase of the signal is detected at the i and q zero crossings. Next, the speed with which the phase rotation angle travels from one zero crossing to another is monitored via a controller (126). The controller (126) manipulates the speed and the direction of the phase rotation angle in order to establish the contents of the received information signal.

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IEEE Transactions on Communication Technology, vol. Com-18, No. 2, Apr. 1970, pp. 110-118 "An FM Detector For Low S/N" by John H. Park, Jr.

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