A device and method for repeater echo cancellation based on additional signals

Abstract

The invention discloses a repeater echo cancellation device and a repeater echo cancellation method based on additional signals. The repeater echo cancellation device comprises a receiving module, a digital down-conversion module, an additional signal module, an echo channel parameter matrix estimation module, a signal subtraction module, a signal addition module, a digital up-conversion module, a power amplifier module and a transmitting module. The repeater echo cancellation method includes a step A that a repeater is initialized; a step B that additional signals are generated; and a step C that the additional signals are added with signals received by the repeater after echo in the signals received by the repeater is cancelled, then digital up-conversion and power amplification are carried out to new signals obtained by adding the additional signals with the signals received by the repeater, and then the new signals are input to the transmitting module to be output. According to the repeater echo cancellation device and the repeater echo cancellation method based on the additional signals, the additional signals do not cause signal interference, relative error of main path attenuation coefficient is low, echo interference is effectively eliminated, data length is short in the operation process, hardware is easy to implement, and gradually convergence process of the signals does not exist after the echo cancellation is carried out to the signals. The repeater echo cancellation device and the repeater echo cancellation method based on the additional signals can be widely applied to the technical field of communication.

Description

technical field [0001] The invention relates to the field of communication, in particular to a device and method for echo cancellation of repeaters based on additional signals. Background technique [0002] Most of the existing digital repeaters use the following technical principle to cancel the echo: by processing the sent signal and the received mixed signal containing echo noise, the characteristic parameters of the echo path are estimated, An analog echo signal is generated inside the radio station, which is subtracted from the received mixed signal to achieve echo cancellation. Since the echo path is usually unknown and time-varying, an adaptive filter is generally used to estimate the echo path. Among them, the adaptive filter based on the Least Mean Square (LMS for short) principle is most widely used. [0003] The following briefly introduces the echo cancellation technology based on the principle of adaptive filter: [0004] The principle block diagram of echo c...

AI Technical Summary

Problems solved by technology

Therefore, the echo cancellation technology based on this principle can achieve a relatively ideal effect even when only the main path echo or the main path echo accounts for a very large proportion in the echo signal, when the echo channel becomes composed of multiple When paths with approximately the same attenuation coefficients are formed, the echo cancellation effect may deteriorate sharply

Images