System and method for eliminating single-frequency interference and multi-frequency interference

A technology for eliminating interference and interfering signals, applied in multi-frequency code systems, transmission systems, baseband system components, etc., can solve problems such as large amount of computation, achieve high tracking accuracy and reduce computational complexity

Active Publication Date: 2010-06-09
MONTAGE TECH CHENGDU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of method requires matrix operations. Although iterative methods can be us...

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  • System and method for eliminating single-frequency interference and multi-frequency interference
  • System and method for eliminating single-frequency interference and multi-frequency interference
  • System and method for eliminating single-frequency interference and multi-frequency interference

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example 1

[0117] Please refer to Image 6 , for a 4k 16QAM modulated OFDM signal, a signal power spectrum diagram of an interference signal is added under 5dB Gaussian noise, wherein the average gain of the interference signal is 1.3, and the frequency is 100.5 subcarrier spacing of the OFDM signal, and Change slowly. It can be seen that the interference signal exceeds the useful signal by 30dB on the signal power spectrum diagram. Since the frequency of the interfering signal is a fractional multiple of the subcarrier spacing of the useful signal, the single-frequency interference will expand to a certain extent in the data domain, and nearly ten nearby data points will be damaged to varying degrees.

[0118] Please refer to Figure 7 , is the signal power spectrum obtained after canceling the reference interference signal during the process of capturing the interference signal when the general LMS algorithm is adopted. It can be seen that the interference signal is more Image 6 I...

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Abstract

The invention relates to a system and a method for eliminating single-frequency interference and multifrequency interference, which comprises the following steps: acquiring an estimated frequency and an estimated gain of an interfering signal through low-precision time-frequency transformation; producing a reference interfering signal according to the estimated frequency and the estimated gain; based on a minimum relevance principle, calculating to obtain an error signal according to a received signal and the reference interfering signal; and based on an adaptive algorithm, updating the reference interfering signal according to the error signal. The method of the invention has the advantages of low computational complexity, high convergence speed and high tracking accuracy, and the like.

Description

【technical background】 [0001] In communication systems, strong single-frequency or multi-frequency interference signals will seriously affect the performance of communication receivers. This type of interference comes from a wide range of sources, such as single-frequency or multi-frequency interference in the propagation space, multiple harmonics introduced by non-ideal circuit boards, and radio frequency modulation or demodulation residues. For a single-carrier transmission system, such interference will directly affect the effective signal-to-noise ratio of the system. For a multi-carrier system similar to OFDM, when the interference frequency falls in the frequency domain of the effective data, if it is not eliminated, it will not only destroy one or more subcarrier data, but also affect the time domain synchronization and channel estimation . The traditional solution is to use a filtering method, such as detecting the interference frequency point, and then using a notch...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26H04B1/707
CPCH03D1/04H03D3/002
Inventor 聂远飞胡刚吴美武
Owner MONTAGE TECH CHENGDU CO LTD
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