Adaptive correction of phase errors in noncoherent demodulation

Details Adaptive correction of phase errors in noncoherent demodulation Adaptive correction of phase errors in noncoherent demodulation

1976-12-20

1977-09-13

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

328155, 329110, H03K 904

Patent

active

040485722

ABSTRACT:
Digital signals asymmetrically modulated upon a carrier, with suppressed or vestigial second sideband, are recovered at a receiver by pseudo-coherent demodulation or periodic sampling and subsequent digitization to provide a train of raw data signals X from which a train of raw quadrature signals Y is derived by digital filtration. Signals X and Y are fed to a phase corrector where they are cross-multiplied with a sine function and a cosine function of a feedback signal W, approximating a corrective phase angle .phi.(t), to yield a corrected in-phase signal X' and a corrected quadrature signal Y'. Signal X' is quantized to provide a reference signal c which, upon subtraction from signal X', produces a bipolar difference signal whose sign bit is multiplied with either the entire signal Y' or its sign bit to provide an error signal V. The latter is averaged over a number of clock cycles, resulting in the feedback signal W whose trigonometric functions are read out from a memory for utilization in the generation of corrected signals X' and Y'.

REFERENCES:
patent: 3761829 (1973-09-01), Spaulding
patent: 3944939 (1976-03-01), LeMouel
patent: 3971996 (1976-07-01), Motley et al.

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