A method of detecting carrier recovery stall and determining the EB / NO ratio of a digital transmission link and device implementing this method.

摘要

P The method of the invention is applied to a phase-phase signal consisting of two quadrature phase data streams providing at each symbol time a received sample whose position in the constellation is defined by its coordinates (In, Qn) obtained by quantization of these data streams. BR/ It consists in: BR/ - determining the number of samples received, called erroneous samples, during a given time interval, whose coordinates correspond to those of control samples, the coordinates of the control samples being different those of samples received under optimal conditions of transmission, called optimal samples; BR/ - calculate the ratio between the number of erroneous samples and the total number of samples received during this determined time interval, this calculated ratio being inversely proportional to Eb / No. / P