Baseband Signal Image Interference Suppression Method

A technology of image interference and baseband signal, applied in transmission systems, electrical components, etc., can solve problems such as image interference, and achieve the effect of suppressing interference, easy to implement, and suppressing image interference

Active Publication Date: 2022-02-15
CHONGQING COLLEGE OF ELECTRONICS ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a baseband signal image interference suppression method to solve the image interference problem caused by zero-IF I and Q offset

Method used

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  • Baseband Signal Image Interference Suppression Method
  • Baseband Signal Image Interference Suppression Method
  • Baseband Signal Image Interference Suppression Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment one is basically as attached figure 1 Shown: baseband signal image interference suppression method, comprising the following steps:

[0030] S1. Configure the front-end broadband receiver, bias the receiving local oscillator frequency and the receiving signal frequency, and separate the image interference signal into positive and negative frequencies. For example, the receiving signal is at the positive frequency, and the image signal is at the negative frequency, that is, the two sides of the zero intermediate frequency, and then Take ADC sampling.

[0031] The bias frequency must meet the following conditions at the same time:

[0032] S11. The zero-IF sampling image signal and the received baseband signal are respectively distributed in positive and negative frequency ranges.

[0033] S12. The sampled baseband received signal is within the sampling frequency range, and frequency aliasing will not occur.

[0034] S2. Perform Hilbert transform filtering o...

Embodiment 2

[0048] Compared with Embodiment 1, the difference is that: for suppressing adjacent channel interference, the specific steps are as follows:

[0049] S1. Configure the front-end wideband receiver, offset the receiving local oscillator frequency and the receiving signal frequency, and separate the adjacent channel interference signal into positive and negative frequencies. For example, the receiving signal is at the positive frequency, and the adjacent channel signal is at the negative frequency, that is, both sides of the zero intermediate frequency. , followed by ADC sampling.

[0050] The bias frequency must meet the following conditions at the same time:

[0051] S11. The zero intermediate frequency sampling adjacent channel signal and the received baseband signal are respectively distributed in positive and negative frequency ranges.

[0052] S12. The sampled baseband received signal is within the sampling frequency range, and frequency aliasing will not occur.

[0053] ...

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Abstract

The invention belongs to the technical field of mobile communication, and discloses a method for suppressing baseband signal image interference, comprising the following steps: S1, configuring a front-end broadband receiver, biasing the receiving local oscillator frequency and receiving signal frequency, and then performing ADC sampling; S2, pairing The sampled I and Q two-way signals are subjected to Hilbert transform filtering; at the same time, the I and Q two-way signals are delayed, and the delay is equal to the processing delay of the Hilbert filter; S3, judging the frequency distribution range of the received signal and the image signal, And by calculating the signal after the image interference is suppressed; S4, digital frequency conversion processing is performed on the signal after the image interference is suppressed, and the signal generated by the processing in step S3 is converted into a baseband I and Q signal of zero intermediate frequency. The invention solves the image interference problem caused by the zero intermediate frequency I and Q offset.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, in particular to a method for suppressing image interference of baseband signals. Background technique [0002] The traditional receiver adopts a superheterodyne structure. The radio frequency signal enters the mixer after passing through the radio frequency filter and the low noise amplifier, and mixes with the local oscillator signal to generate an intermediate frequency signal output. The image rejection filter filters out the mixed image signal, and the intermediate frequency The filter filters out the out-of-band interference signal and plays the role of channel selection, then performs gain adjustment and ADC sampling on the intermediate frequency signal, and converts it into a digital signal for signal processing in the digital domain. [0003] With the development and improvement of the integration of radio frequency devices, zero-IF receivers have been widely used at present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B1/30
CPCH04B1/10H04B1/1027H04B1/30
Inventor 陶小鱼曾晓宏陈川东
Owner CHONGQING COLLEGE OF ELECTRONICS ENG
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