Patent ID: 7043203
Filing Date: 2006-05-09
Classification: H04B

Abstract:
1. A process for retransmitting single frequency signals, of the type used in a single frequency signal repeater and comprising the steps of: [a] receiving a first radio frequency signal through a receiving antenna, said first radio frequency signal having a receiving power, [b] converting said first radio frequency signal into a process signal, [c] filtering said process signal, [d] amplifying said process signal, [e] automatically controlling said process signal gain, [f] reconversion of said process signal into a second radio frequency signal, [g] amplifying the power of said second radio frequency signal, [h] output filtering said second radio frequency signal, [i] transmitting said second radio frequency signal through a transmitting antenna, where a coupling takes place between said transmitting antenna and said receiving antenna, and [j] a step of adaptive cancellation with an adaptive algorithm of said coupling between said transmitting antenna and said receiving antenna, said step of adaptive cancellation comprising a negative feedback of a feedback signal and said step of adaptive cancellation operating on digitized signals, wherein said step of adaptive cancellation takes, as input signal, said process signal digitized after said automatic gain control step, and wherein said adaptive algorithm follows a criterion of the group formed by the criterion of minimum mean squared error and the criterion of least squares.