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A Digital Echo Cancellation Method

An echo and digital technology, applied in the field of digital echo signal cancellation, can solve problems affecting system performance and work efficiency decline, and achieve the effect of increasing consumption and improving work efficiency

Active Publication Date: 2017-08-25
成都电科慧安科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Frequent switching of states will lead to a decrease in work efficiency and affect system performance

Method used

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  • A Digital Echo Cancellation Method
  • A Digital Echo Cancellation Method
  • A Digital Echo Cancellation Method

Examples

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Embodiment Construction

[0051] Traditional adaptive echo cancellation methods such as figure 2 As shown, the x(n) signal is divided into two paths, one path is amplified and transmitted through the transmitting antenna, and fed back through the echo coupling channel to form echo interference. The echo interference is superimposed with the incoming signal and noise and is received by the receiving antenna to form the echo interference component y(n) in the desired signal d(n). The other path is delayed and input to the transversal filter to obtain the estimated value of the echo signal The delay here is to make the Time-domain aligned with the echo interference component in the desired signal. d(n) with The error signal e(n) is obtained by subtraction, and the weight of the adaptive filter is updated under the LMS criterion to minimize the mean square error.

[0052] The transversal filter here is the estimation of the entire loop passed by the x(n) signal, which not only includes the echo cha...

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Abstract

The invention relates to the field of digital signal processing, in particular to the cancellation of echo signals in the field of digital signal processing, and specifically to the digital echo cancellation method under the background of practical application. The method of the present invention is that on the basis of the LMS algorithm, the input signal of the transversal filter is first amplified and then filtered, and the amplified multiple is consistent with the loop gain. This makes it unnecessary to re-estimate the echo channel when the loop gain changes greatly, thereby improving the working efficiency of the system. In addition, one stage of amplification and attenuation is added before and after the adaptive module, so that the input signal of the transversal filter will not overflow due to excessive amplitude after amplification without changing the bit width. In addition, the present invention will not deteriorate the system performance while improving the working efficiency of the system, and the resource consumption has no obvious change compared with the traditional algorithm.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a cancellation method for digital echo signals in the field of digital signal processing. Background technique [0002] At present, systems such as jammers and repeaters need to process the signals received by the antenna, and then amplify and transmit them. However, there is coupling between the transmitting and receiving antennas, and the transmitted signal will be partially reflected back to the receiving antenna during space propagation, forming echo interference. The echo interference is superimposed on the incoming wave signal, received by the receiving antenna for processing, and then amplified before being emitted. Such cyclic amplification will affect the system performance, and in serious cases, it will cause the system to self-excite. Therefore, it is necessary to take effective measures to eliminate echo interference, prevent system self-excitation, and impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 李朝海黄东辉朱凌峰江文颖夏威
Owner 成都电科慧安科技有限公司