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Interference restraining method for orthogonal frequency division multiplexing signal

A technology of multiplexing signals and orthogonal frequency division, applied in the field of interference suppression in OFDM signals, can solve the problems of damaged sub-carriers, reception failure, OFDM symbol synchronization failure, etc. Effect

Active Publication Date: 2013-01-30
HANGZHOU NATCHIP SCI & TECH
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Problems solved by technology

However, narrow-band interference such as single-frequency and same-frequency analog TV with medium and high intensity will damage a large number of subcarriers, resulting in reception failure
During the symbol synchronization process of the OFDM system, medium and high-intensity interference will affect the correlation of data, which will cause OFDM data to be correlated everywhere, instead of only having correlation in the cyclic prefix or suffix data, which will lead to OFDM symbol synchronization. fail

Method used

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  • Interference restraining method for orthogonal frequency division multiplexing signal

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Embodiment Construction

[0012] In the present invention, the input data enters the FFT / IFFT module for FFT conversion after passing through two ping-pong selected buffers, then enters the interference detection and suppression module for interference shielding, then returns to the FFT / IFFT module for IFFT conversion, and finally the digital AGC Keep the power of the shielded signal stable.

[0013] The input signal is segmented according to the order of the data flow. Each segment of data includes sequential M data. The next segment of data is the M-N+1th data of the previous segment as the starting point of the segment, and the front and rear segments overlap N data. Due to the FFT New data is sent during the transformation, and the data of the two FFT transformations needs to have N-point overlapping parts (0<N<M), so the input data must first enter two buffers for ping-pong operation, and the data in the overlapping parts must be simultaneously Enter two buffers, and after each buffer is full of d...

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Abstract

This invention relates to a method for suppressing interference in OFDM signals including: segmenting received OFDM signals according to the order of data flows and superposing n data for the segments, carrying out FFT conversion to data of each segment to get frequency domain data of the received signals and computing mean power of the frequency domain to set three thresholds according to the mean power, comparing the power of the frequency domain with the three thresholds to test out interference to be screened. This invention provides a frequency domain process method for single frequency and shared frequency interference in the OFDM signals.

Description

technical field [0001] The invention belongs to the field of digital signal transmission, in particular to a method for suppressing interference in OFDM signals in a digital Orthogonal Frequency Division Multiplexing (OFDM) receiver. Background technique [0002] OFDM is a multi-carrier modulation transmission scheme. The OFDM system uses a large number of mutually orthogonal sub-carriers for data transmission. Low-intensity narrow-band interference such as single-frequency and same-frequency analog TV will only damage a small number of subcarriers, and the data of most subcarriers remains intact. However, narrow-band interference such as single-frequency and same-frequency analog TV with medium and high intensity will damage a large number of subcarriers, resulting in reception failure. During the symbol synchronization process of the OFDM system, medium and high-intensity interference will affect the correlation of data, which will cause OFDM data to be correlated everywh...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04N7/06H04J11/00
Inventor 邹志永赵小祥陈继晖
Owner HANGZHOU NATCHIP SCI & TECH
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