System comprising an emitter adapted to emit a primary wave, a receiver adapted to receive the primary wave, and a wave shaping device adapted to improve, at the receiver, the reception of the primary wave, wherein: - the receiver comprises: - an antenna adapted to receive the primary wave from the emitter, and - a processing unit connected to said antenna in order to process the signals coming from the antenna, and - a signature element adapted to emit a secondary wave which is a function of the primary wave received by the antenna, - the signature element being a non-linear electrical circuit adapted to deform the signal of the primary wave with a predetermined signature in order to generate the secondary wave signal, - the wave shaping device comprises: - a surface which interacts with the primary wave, said surface comprising a plurality of adjustable elements for modifying an impedance of said surface and for modifying the manner in which the primary wave is reflected and transmitted by said surface, and - a controller connected to the surface, said controller comprising an optimization module which maximizes or minimizes a value for determining parameters, and said controller adapted to control the adjustable elements based on said parameters, - a wave receiving device which is connected to the controller and which is adapted to measure a secondary wave generated by the reception of the primary wave by the receiver, without the receiver transmitting information to the wave shaping device concerning its reception of the primary wave, and - the controller comprising an estimation module adapted to determine an estimated value for the reception of the primary wave by the receiver, by means of the measurement of the secondary wave, and the optimization module of the controller is adapted to use said estimated value to determine the control parameters of the adjustable elements. - the receiver comprises: - an antenna adapted to receive the primary wave from the emitter, and - a processing unit connected to said antenna in order to process the signals coming from the antenna, and - a signature element adapted to emit a secondary wave which is a function of the primary wave received by the antenna, - the signature element being a non-linear electrical circuit adapted to deform the signal of the primary wave with a predetermined signature in order to generate the secondary wave signal, - an antenna adapted to receive the primary wave from the emitter, and - a processing unit connected to said antenna in order to process the signals coming from the antenna, and - a signature element adapted to emit a secondary wave which is a function of the primary wave received by the antenna, - the signature element being a non-linear electrical circuit adapted to deform the signal of the primary wave with a predetermined signature in order to generate the secondary wave signal, - the wave shaping device comprises: - a surface which interacts with the primary wave, said surface comprising a plurality of adjustable elements for modifying an impedance of said surface and for modifying the manner in which the primary wave is reflected and transmitted by said surface, and - a controller connected to the surface, said controller comprising an optimization module which maximizes or minimizes a value for determining parameters, and said controller adapted to control the adjustable elements based on said parameters, - a wave receiving device which is connected to the controller and which is adapted to measure a secondary wave generated by the reception of the primary wave by the receiver, without the receiver transmitting information to the wave shaping device concerning its reception of the primary wave, and - the controller comprising an estimation module adapted to determine an estimated value for the reception of the primary wave by the receiver, by means of the measurement of the secondary wave, and the optimization module of the controller is adapted to use said estimated value to determine the control parameters of the adjustable elements. - a surface which interacts with the primary wave, said surface comprising a plurality of adjustable elements for modifying an impedance of said surface and for modifying the manner in which the primary wave is reflected and transmitted by said surface, and - a controller connected to the surface, said controller comprising an optimization module which maximizes or minimizes a value for determining parameters, and said controller adapted to control the adjustable elements based on said parameters, - a wave receiving device which is connected to the controller and which is adapted to measure a secondary wave generated by the reception of the primary wave by the receiver, without the receiver transmitting information to the wave shaping device concerning its reception of the primary wave, and - the controller comprising an estimation module adapted to determine an estimated value for the reception of the primary wave by the receiver, by means of the measurement of the secondary wave, and the optimization module of the controller is adapted to use said estimated value to determine the control parameters of the adjustable elements.