Adaptive filter arrangement for improved recovery of wanted signals

摘要

An adaptive filter arrangement for removing undesired autocorrelation or cross-correlation from target signals containing desirable autocorrelation or cross-correlation, comprises a coefficient generator (24; 174) for generating one or a plurality of filter coefficients, an adaptive filter (26; 172) coupled to the coefficient generator to receive the filter coefficient(s) and apply a filter function dependent thereon; and compensating means (70, 72; 180) for modifying the coefficient(s) such as to prevent the adaptive filter from removing desirable autocorrelation or cross-correlation that exists in the target signal or signals. The arrangement can be used in an on-channel repeater (Fig. 7) or in an IQ crosstalk removal system (Fig. 10).