Abstract: Apparatus for measuring the distance between a mobile station and a base station in a mobile radio-communications system, the apparatus including a device for determining the reception instant at which the mobile station receives predetermined data transmitted by the base station, the circuit including a correlator for correlating an in-phase component and a quadrature component of a modulated signal received by the mobile station respectively with an in-phase component and a quadrature component of a reference signal generated in the mobile station and corresponding to the predetermined data, correlator delivering real components and imaginary components of correlation coefficients, and the apparatus being characterized in that it further includes a processor for using the real components and the imaginary components of the correlation coefficients to determine a complex magnitude whose phase varies continuously as a function of the reception instant.

Abstract: Apparatus or measuring the distance between a mobile station and a base station in a mobile radiocommunications system, said apparatus including means for determining the reception instant at which the mobile station receives predetermined data transmitted by the base station, which means themselves include correlation means (4) for correlating an in-phase component and a quadrature component of a modulated signal received by the mobile station respectively with an in-phase component and a quadrature component of a reference signal generated in the mobile station and corresponding to said predetermined data, said correlation means delivering real components and imaginary components of correlation coefficients, and said apparatus being essentially characterized in that it further includes means (7) for using the real components and the imaginary components of the correlation coefficients to determine a complex magnitude whose phase varies continuously as a function of said reception instant.

Abstract: 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.