An optical sensor system for identifying a distance or a property of an object (O1, O2) in a transmission line between a transmitter and a receiver including - a wavelet generator for generating at least one pair of wavelets as a feed signal for controlling the transmitter, wherein the wavelets are chosen such that pairs result from respectively a sine function and a cosine function orthogonal thereto; - a transmitter for generating a transmission signal from the feed signal in order to send the transmission signal into the transmission line, so that it is influenced by the object (O1, O2); - a compensation transmitter for emitting a compensation transmitter signal to a receiver, wherein the compensation transmitter is arranged to be fed with a compensation feed signal; - a receiver for receiving the transmission signal influenced by the object as a receive signal, for receiving the compensation transmitter signal overlaid with the receive signal, wherein the receiver is arranged for outputting a receiver output signal and for feeding the receiver output signal to a processing unit; - a processing unit for further processing the receiver output signal to form a further-processed receiver output signal in that the receiver output signal is multiplied with respectively one pair of wavelets and subsequently integrated, whereby Fourier coefficients are formed; - a memory for storing the further-processed receiver output signal; - a second memory for storing the Fourier coefficients - a reference memory (MRef) for storing reference Fourier coefficients generated during a calibration; - an estimator for performing a quotient formation in that the Fourier coefficients are divided by the associated reference Fourier coefficients and object reflection Fourier coefficients are formed which permit an indication about the property of the object or the distance to the object; - a retransformation unit for multiplying the Fourier coefficients with the factor -1 and with respective wavelets, - wherein the retransformation unit includes a summing unit for generating the compensation feed signal by summing the multiplied signals to form the compensation feed signal, - wherein the retransformation unit is arranged for feeding the compensation feed signal to the compensation transmitter. - a wavelet generator for generating at least one pair of wavelets as a feed signal for controlling the transmitter, wherein the wavelets are chosen such that pairs result from respectively a sine function and a cosine function orthogonal thereto; - a transmitter for generating a transmission signal from the feed signal in order to send the transmission signal into the transmission line, so that it is influenced by the object (O1, O2); - a compensation transmitter for emitting a compensation transmitter signal to a receiver, wherein the compensation transmitter is arranged to be fed with a compensation feed signal; - a receiver for receiving the transmission signal influenced by the object as a receive signal, for receiving the compensation transmitter signal overlaid with the receive signal, wherein the receiver is arranged for outputting a receiver output signal and for feeding the receiver output signal to a processing unit; - a processing unit for further processing the receiver output signal to form a further-processed receiver output signal in that the receiver output signal is multiplied with respectively one pair of wavelets and subsequently integrated, whereby Fourier coefficients are formed; - a memory for storing the further-processed receiver output signal; - a second memory for storing the Fourier coefficients - a reference memory (MRef) for storing reference Fourier coefficients generated during a calibration; - an estimator for performing a quotient formation in that the Fourier coefficients are divided by the associated reference Fourier coefficients and object reflection Fourier coefficients are formed which permit an indication about the property of the object or the distance to the object; - a retransformation unit for multiplying the Fourier coefficients with the factor -1 and with respective wavelets, - wherein the retransformation unit includes a summing unit for generating the compensation feed signal by summing the multiplied signals to form the compensation feed signal, - wherein the retransformation unit is arranged for feeding the compensation feed signal to the compensation transmitter.