Echo noise suppressor

A technology of echo noise and suppressor, which is applied in the field of echo noise suppressor, can solve problems affecting the development of repeaters, installation site restrictions, and large equipment volume, so as to promote stability and reliability, reduce restrictions, The effect of improving efficiency

Inactive Publication Date: 2009-05-27
FUJIAN SUNNADA COMM
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  • Claims
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Problems solved by technology

Due to different regions with different on-site environments, the isolation settings are also different. Usually, professional technicians are required to manually test the isolation according to the on-site environment. Repeater development

Method used

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] Such as figure 1 Shown, the present invention is based on the design of the filter algorithm of FPGA, and the design of each module of FPGA has adopted the design method of pipeline, and it comprises sub-filter module and main filter module, it is characterized in that: described sub-filter After the module calculates and generates self-excitation, the system input signal and the expected noise perform initial spectrum estimation, and provide signals for the system to obtain the basic signal-to-noise ratio SNR, which is completed by two parallel NLMS filters, and the output of the two parallel NLMS filters After the signal is calculated by the average power of 4TAP, the value is sent to the SNR calculation module. If the SNR is calculated, the SNR only refers to the relative SNR; assuming that the power calculated by the input of the NLMS_SI modu...

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Abstract

The invention relates to an echo noise suppressor, which comprises a secondary filter module and a main filter module, and is characterized in that the secondary filter module calculates input signals of a system after generating self excitation and estimates noise to carry out initial spectrum estimation, and provides signals for the system to acquire basic signal-to-noise ratio SNR by two parallel NLMS filters; after output signals of the two parallel NLMS filters are subjected to power averaging calculation of 4TAP, calculated numerical values are sent to an SNR calculation module which is connected with a gain margin calculation module, and the system can obtain gain acquired by a self-excitation cancellation system during system design according to output of the gain margin calculation module; and moreover, the signals processed by the SNR calculation module are input to the main filter through a step length control module. Based on design of filter algorithm of FPGA, the echo noise suppressor effectively monitors a critical self-excitation state of a repeater and automatically cancels echo noise, reduces limit of isolation to the repeater, and effectively promotes development of the repeater.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an echo noise suppressor of a repeater. Background technique [0002] Because the original signal of the transmitting antenna of the repeater returns to the delayed and distorted part of the signal source of the receiving antenna, that is, the echo, its existence makes the antenna before and after the repeater unstable to a certain extent. In general engineering, the physical distance between the front and rear antennas is usually set reasonably, that is, the isolation is increased to avoid self-excitation of echo noise. Due to different regions with different on-site environments, the isolation settings are also different. Usually, professional technicians are required to manually test the isolation according to the on-site environment. development of repeaters. Contents of the invention [0003] The purpose of the present invention is to provide an echo noise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/52H04B3/21H04B1/525
Inventor 林小泉
Owner FUJIAN SUNNADA COMM
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