Impulse noise detection method in OFDM communication system

A communication system, impulse noise technology, applied in baseband systems, transmission systems, digital transmission systems, etc., can solve the problems of large peak-to-average ratio, unsatisfactory effect, and difficulty in ensuring the accuracy of time domain detection methods.

Active Publication Date: 2016-08-24
BEIJING HANNUO SEMICON TECH CO LTD
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Problems solved by technology

However, because the OFDM signal itself is Gaussian in the time domain, the peak-to-average ratio itself is relatively large, so the accuracy of the time-domain detection method is difficult to guarantee
For the frequency domain detection method, the FFT operation at the receiving end of the OFDM system expands the en

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  • Impulse noise detection method in OFDM communication system
  • Impulse noise detection method in OFDM communication system

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[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be understood that the described embodiments are only some of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0023] In a general OFDM communication system, in order to reduce the requirements for filter roll-off characteristics and reduce the interference to adjacent channels, a section of subcarriers at the edge of the OFDM symbol frequency band usually does not modulate data; while the center of the frequency band of the OFDM symbol, Due to the influence of the local oscillator, some subcarriers are usually reserved for not modulating dat...

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Abstract

The invention provides an impulse noise detection method in an OFDM communication system, comprising the following steps: setting a judgment threshold based on the average energy of the null subcarriers of at least one OFDM symbol in an OFDM communication system; estimating the average energy of the null subcarriers of subsequent OFDM symbols, comparing the average energy with the judgment threshold, and judging whether there is impulse noise; and updating the judgment threshold according to the comparison result, and giving an instruction on whether there is impulse noise detected. Impulse noise is detected based on the fact that data is not modulated on the null subcarriers in an OFDM communication system, energy mainly comes from leaked energy of Gaussian noise and adjacent subcarriers, and the energy of impulse noise is usually significantly higher than that of Gaussian noise.

Description

technical field [0001] The invention relates to an Orthogonal Frequency Division Multiplexing (OFDM) communication system, in particular to a pulse noise detection method in the OFDM communication system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology. Its modulation and demodulation are realized based on Inverse Fast Fourier Transform (IFFT) and Fast Fourier Transform (FFT) respectively, and it is the lowest complexity , The most widely used multi-carrier transmission scheme. OFDM data divides the channel into several orthogonal sub-channels, converts high-speed data signals into parallel low-speed sub-data streams, and modulates them on each sub-channel for transmission. At the receiving end, the orthogonal signals can be separated by correlation technology, which can reduce the mutual interference between sub-channels. [0003] For practical communication systems, in addition to additiv...

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Application Information

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IPC IPC(8): H04L25/06H04B17/309
CPCH04B17/309H04L25/061
Inventor 刘跃赵辉张诚
Owner BEIJING HANNUO SEMICON TECH CO LTD
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