Blind channel equaliser

A blind channel equalizer device (1) for a radiofrequency receiver designed for a modulation with constant envelope signal at transmission, comprising:

• an adaptable linear digital filter (10), defined at a time (n) by its coefficients (A(n)), designed to filter an input signal (X) so as to produce an output signal (Y),
• an estimator (11) designed to estimate a power (P) of the input signal (X),
• an adaptor (12) designed to adapt the filter (10) by calculating the coefficients (A(n)) of the filter (10) at a time (n), by subtracting from the coefficients (A(n−1)) of the filter (10), at a preceding time (n−1), the gradient of a cost function (J) with a correction coefficient (λ),
• where the cost function (J) comprises a first distance criterion between the square of the output signal (Y) and the power (P), where the correction coefficient (λ) is a product comprising a constant convergence coefficient (μ), wherein the correction coefficient (λ) furthermore comprises a scaling coefficient (Gs) inversely proportional to the square of the power (P).