Apparatus for suppressing interfering DC component shifts in a radio receiver of the direct conversion type, and a corresponding method suppression

摘要

Apparatus for suppressing interfering DC component shifts affecting reception of a radio-frequency signal transmitted in signal elements referred to as "bursts", in particular for a receiver of the direct conversion type, and a corresponding method of suppression. The apparatus comprises a device for normalizing the power of the successively received bursts relative to the power of the resulting wanted signal, a device for determining value and position characteristics for the DC component shift for each received burst, each shift being assumed to have at least approximately the same time position relative to the burst that it degrades as the following shift relative to the following burst, and corrector for subtracting the shift characteristics determined for each burst from the baseband signal obtained after normalization. The invention is applicable to mobile radio terminals in digital cellular radio networks.