DIRECT-DETECTION DIGITAL-CORRECTION RECEIVER

摘要

FIELD: radio electronics. SUBSTANCE: receiver has digital-readout shaping units for common-mode and quadrature signals in modulating-signal frequency band and for detecting second-order signal component caused by amplitude-modulated noise signal. In addition, it has readout digital correction unit that functions to eliminate second-order signal component to produce corrected digital readings. One method for digital correction of readings of data signal used for quadrature modulation of carrier signal involves shaping of estimate readings of second-order component resulting from change-over of carrier signal by averaging digital readings within two time periods and determining edge time of common-mode and quadrature signals during time periods due to noise signal. In determining edge time digital readings can be differentiated and results smoothed down. In other version of receiver, estimate readings of second-order signal component are shaped by unit averaging difference square of respective digital readings of common-mode and quadrature signals thereby determining amplitude of amplitude-modulated carrier signal as well as by amplitude and digital readout combining unit to shape estimate readings. EFFECT: reduced impact of second-order components. 16 cl, 11 dwg