Method and apparatus for judging timing phase of modem which is

Details Method and apparatus for judging timing phase of modem which is Method and apparatus for judging timing phase of modem which is

1993-12-02

1996-06-04

Coles, Sr., Edward L.

Pulse or digital communications

Receivers

Angle modulation

375331, 375332, H03D 322

Patent

active

055240267

ABSTRACT:
A numerical value (Y-X).multidot.0.5 indicative of a phase angle .theta..sub.1 in the first quadrant is calculated on the assumption that a quadrant of an input vector signal (x+jy) is judged and the signal is rotated into the first quadrant by a rotational vector signal (a+jb) and the phase angle of 0 to .pi. is expressed by 0 to +2 and the phase angle of .pi. to 2.pi. is expressed by -2 to 0 as a prerequisite. Further, a numerical value c indicative of an offset phase angle .theta..sub.2 to return the vector signal into the original signal and the phase number indicative of each of the (N) divided phase regions of the phase plane is directly obtained as bit data.

REFERENCES:
patent: 3727136 (1973-04-01), Schroeder et al.
patent: 3969674 (1976-07-01), Tracey
patent: 4234957 (1980-11-01), Tracey et al.
patent: 4631738 (1986-12-01), Betts et al.
patent: 4771438 (1988-09-01), Nash
patent: 5093847 (1992-03-01), Cheng

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