Apparatus for cancelling periodic carrier phase jitters.

摘要

A complex baseband signal is applied to an input terminal (1). The carrier phase is protected at successive instance by a phase detector (102) and the most recent set of detected phase values is stored in a shift register (103). Phase predicting means comprise weighting amplifiers (111-113) controlled by correlators (121-123) and a summing circuit (108). The predicted phase signal from the summing circuit (108) is converted by a circuit (109) to a complex trigonometric function with rotates the complex baseband signal by a corresponding phase angle in a phase rotator (104). An error detector (106) detects an error associated with data discriminated from the complex baseband signal. The correlators (121-123) calculate correlations between the detected carrier phases stored in the shift register (103) and the error. A plurality of such circuits may be used for jitter cancellation in a parallel data transmission system using a plurality of complex baseband signals and a pilot signal.