Device and method for narrowband interference suppression of OFDM (orthogonal frequency division multiplexing) receiver

A narrow-band interference and suppression device technology, applied in the field of communication, can solve problems such as poor real-time performance, and achieve good real-time performance, simple and reliable implementation, and good market competitiveness.

Active Publication Date: 2012-04-04
GUANGDONG SHENGLU TELECOMM TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] (2), poor real-time performance

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  • Device and method for narrowband interference suppression of OFDM (orthogonal frequency division multiplexing) receiver
  • Device and method for narrowband interference suppression of OFDM (orthogonal frequency division multiplexing) receiver
  • Device and method for narrowband interference suppression of OFDM (orthogonal frequency division multiplexing) receiver

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Embodiment Construction

[0031] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0032] figure 1 The realization position diagram of the narrowband interference suppression device provided in the present invention in the OFDM receiver. It can be seen from the figure that the narrowband interference suppression device provided by the present invention is located after digital intermediate frequency processing and before baseband demodulation processing. The processing of the narrowband interference signal by the device can effectively enhance the ability of the OFDM receiver to resist narrowband interference.

[0033] The specific embodiment of the device provided by the invention is as figure 2 As shown, it includes a narrowband interference search unit 201 , a time-domain digital notch filter generation unit 202 and a time-domain digital notch filter unit 203 .

[0034] The narrowband interference search unit 201...

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Abstract

The invention discloses a device and a method for the narrowband interference suppression of an OFDM (orthogonal frequency division multiplexing) receiver, wherein the device is located on an OFDM receiving chain and between an intermediate-frequency processing module and a base band processing module; and the device is characterized by comprising a narrowband interference searching module, a digital notch filter coefficient generation module and a time domain digital notch filter module which are orderly connected. The method comprises the following steps of: firstly performing a fast Fourier transform on a digital signal input to the OFDM receiver to obtain the frequency spectrum characteristics of the input signal, then judging whether the input signal has a narrowband interference and obtaining the interference characteristics according to a set threshold, then inquiring a preset filter coefficient table according to the interference characteristics to obtain a filter coefficient, finally configuring the filter coefficient in the time domain digital notch filter module; in this way, after the digital signal input to the OFDM receiver passes through the filter, a signal after the narrowband interference is filtered is output, thereby improving the performance of resisting narrowband interference of an OFDM demodulation system.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically relates to a narrowband interference suppression device and method for an OFDM receiver. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) is a modulation technique that uses a multi-carrier transmission method to transmit a data string through sub-carriers with a low transmission rate. OFDM technology uses a discontinuous multi-tone modulation technology to combine a large number of signals in carriers of different frequencies into a single signal to complete signal transmission. The development of OFDM technology is to improve the spectrum utilization of the carrier. Its characteristic is that the subcarriers are orthogonal to each other, so the spectrum after spread spectrum modulation can overlap with each other, thus reducing the mutual interference between the subcarriers. The WiMA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 傅瑞锦杨华胡泽伟
Owner GUANGDONG SHENGLU TELECOMM TECH
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