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Method for reducing narrow-band interference of OFDM receiver

A technology of orthogonal frequency division multiplexing and narrowband interference, applied in multi-frequency code systems, transmission systems, electrical components, etc., can solve the problems that the advantages of OFDM modulation methods cannot be reflected, and the performance of OFDM demodulation systems is reduced.

Inactive Publication Date: 2012-01-04
ALI CORP
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Problems solved by technology

[0010] In view of the prior art, when the narrowband interference energy is relatively large relative to the signal energy, if there are no special processing methods for narrowband interference, the performance of the OFDM demodulation system will be seriously reduced, making the advantages of the OFDM modulation method unable to be reflected

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  • Method for reducing narrow-band interference of OFDM receiver
  • Method for reducing narrow-band interference of OFDM receiver
  • Method for reducing narrow-band interference of OFDM receiver

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Embodiment Construction

[0036] The present invention proposes a method for alleviating the narrowband interference of an Orthogonal Frequency Division Multiplexing (OFDM) receiver. The method proposes to adjust the output gain of the Fast Fourier Transform (FFT) to adjust the signal output for the OFDM system, and then detects Narrowband interference implements a method of interference suppression to improve the performance of the OFDM demodulation system against narrowband interference.

[0037] Among them, OFDM is a special multi-carrier transmission scheme. It can be regarded as a modulation technology or a multiplexing technology. The OFDM system passes high-speed data streams through Serial-to-parallel conversion makes the duration of data symbols on each subcarrier increase relatively, and the interference of the narrowband part can only affect a small part of the subcarriers, so the OFDM system can resist narrowband interference to some extent. However, when the narrowband interference energy ...

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Abstract

The invention relates to a method for slackening the narrow-band interference of the orthogonal frequency division multiplex (OFDM) receiver, which aims the OFDM system to regulate the Fast Fourier Transform (FFT) output gain, detect narrow-band interference, and implement interference suppression, in order to improve the narrow-band interference preventing performance of the OFDM demodulation system. The method comprises: creating an output signal distribution diagram by the output signal; setting multiple judging lines in the diagram; obtaining the signal number distribution by the counterscorresponding to the judging lines to determine an output gain and a threshold value; judging out noise according to the threshold value and implementing the interference deleting step; implementing the output signal energy regulation by the output gain; and outputting the signal after interference suppression and gain regulation; consequently, improving the narrow-band interference preventing performance of the OFDM demodulation system.

Description

technical field [0001] The present invention relates to a method for mitigating narrow-band interference in OFDM receivers. The method is aimed at an OFDM system. In particular, it proposes a method for performing interference suppression by adjusting FFT output gain and detecting narrow-band interference to improve OFDM solution. Adjust the system's anti-narrowband interference performance. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a modulation technique and also a multiplexing transmission technique, which uses a multicarrier (Multicarrier) transmission method to pass a data string through a subcarrier with a low transmission rate to send. OFDM technology uses a discontinuous multi-tone 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 frequency spectrum utilization of the carrier, or to imp...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B1/71
Inventor 李汉军
Owner ALI CORP