Method and device for canceling echo interference of repeater

Abstract

The invention relates to an echo interference elimination method and device of a repeater. The method comprises the steps that a self-adapting filter output signal y(n) is generated based on a self-adapting filter input signal u(n) and an optimal weight vector w(n), a time delay error signal e(n-delay) is generated based on a time delay intermediate frequency signal d(n-delay) and a time delay self-adapting filter output signal y(n-delay), and an error signal e(n) is generated based on an intermediate frequency signal d(n) and the self-adapting filter output signal y(n); the optimal weight vector w(n) is generated based on a time delay self-adapting filter input signal u(n-delay), the time delay error signal e(n-delay), the error signal e(n) and an optimal weight vector w(n-delay). By means of the echo interference elimination method and device of the repeater, sufficient arithmetic resource optimization is conducted, and optimal resource utilization is achieved under the circumstance that algorithm implementation efficiency is affected as less as possible; compared with an echo interference elimination method in the prior art, less logical resources are occupied, and module stability is higher.

Description

technical field [0001] The present invention relates to the technical field of mobile multimedia broadcasting, more specifically, to a method and device for canceling echo interference of a repeater. Background technique [0002] In order to prevent the amplified forwarding signal from entering the receiving antenna, destroying the spectrum of the forwarding signal, or even causing self-excitation, the traditional wireless repeater needs to fully consider the isolation of the transmitting and receiving antennas during installation. If the installation environment permits, the transceiver antenna can achieve a high isolation (greater than the gain of the whole machine +15dB), but in most cases, it will cost extra to achieve such a high isolation, or even fail to achieve the required Isolation, such as coverage where the transceiver antennas are exposed to the outdoors, household micropower repeaters with built-in transceiver antennas, etc. [0003] However, adding the repeat...

AI Technical Summary

Problems solved by technology

Existing repeater echo interference cancellation systems are mainly implemented using LMS (Least Mean Square Least Mean Square Error) or least squares adaptive filtering algorithms, so their ubiquitous implementation consumes a large amount of logic resources and is not suitable for broadband signals Processing, echo interference cancellation is unstable, and there are many out-of-band spurs, etc.

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