Method for suppressing electromagnetic interference in an amplitude modulated radio signal, in particular received in an electric or hybrid vehicle

摘要

A method for attenuating electromagnetic interference in an AM radio signal received by a radio receiver, so as to produce a filtered radio signal Z_n defined by Z_n=W_n^TY_n at the time n, where Y_n is a vector the components of which correspond to the radio signal received by a first antenna and to a second signal received by a second antenna connected to the source of interference, respectively, and W_n is a vector the components of which correspond to the complex coefficients of an impulse response filter, with: Zn=w_1,n·y_1,n+w_2,n·y_2,n, by the introduction of a correlation between the real and imaginary parts of the complex coefficients. The complex coefficients being expressed in polar coordinates, so that; $$ w_{1,n}=g_{1,n}\&\#x2062;e^{j\&\#x2062;\&\#x2062;2\&\#x2062;{\mathrm{\pi \theta }}_{1,n}}\&\#x2062;\&\#x2062;\mathrm{and}\&\#x2062;\&\#x2062;w_{2,n}=g_{2,n}\&\#x2062;e^{j\&\#x2062;\&\#x2062;2\&\#x2062;{\mathrm{\pi \theta }}_{2,n}},$$and of the implementation of a predetermined iterative algorithm configured to determine the g_1,n, g_2,n, θ_1,n and θ_2,n able to minimize the following cost function:; $$ J_{\mathrm{CPA}}=E\&\#x2062;\left\{{\frac{z}{z_n}-1}^2\right\}=E\&\#x2062;\left\{e^{j\&\#x2062;\&\#x2062;\theta \&\#x2062;\&\#x2062;z_n}-1\right\}.$$