FIELD: physics, communication.
SUBSTANCE: invention is related to methods and devices for removal of fixed bias (DC bias) in radio device based on zero intermediate frequency (ZIF). Method for elimination of DC bias contains stages, in which signals are transformed into digital samples, DC bias of fame is calculated with the help of whole frame capture and part of adjacent channels, DC bias is removed from digital signal, rotation is carried out to remove frequency error from digital signal, and channel filtration is carried out for digital signal. System includes digital circuit of DC bias elimination, which includes analog-digital converter (108), channel filter (110) joined to transformer (108) and system (114) of rotator, which is connected to inlet and outlet of channel filter. System (114) of rotator includes unit (116) for assessment of DC bias connected to inlet of channel filter, component (120) for elimination of DC bias connected to unit for assessment of DC bias, and rotator (122), which is connected to component for removal of DC bias, at that outlet of rotator is connected to inlet of channel filter.
EFFECT: development of device for elimination of fixed bias (DC bias) in radio device based on zero intermediate frequency (ZIF).
12 cl, 8 dwg
