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Interference information filling system and method based on low-bit-rate LDPC code

A technology of LDPC code and interference information, applied in the direction of coding, code conversion, coding components, etc., can solve problems such as performance deterioration of communication systems

Active Publication Date: 2021-06-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of communication system performance deterioration caused by the presence of high-power narrow-band noise in a strong interference environment. The present invention provides a method based on A system and method for filling low-code-rate LDPC code interference information. The method reduces the interference of high-power noise by repeatedly sending at the sending end and diversity receiving at the receiving end, and finally through the LDPC code decoding unit, information replacement unit and The iterative update between the diversity receiving units to realize the update of the interference information in the decoding soft information realizes the anti-interference covert communication in the communication system with strong interference, which has the advantages of strong anti-interference and good concealment

Method used

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  • Interference information filling system and method based on low-bit-rate LDPC code

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Embodiment 1

[0042] Such as figure 2 As shown, a system based on low code rate LDPC code interference information filling disclosed in this embodiment includes an LDPC code encoding unit, a repetition diversity unit, a modulation unit, a demodulation unit, a diversity receiving unit, an LDPC code decoding unit and information Replacement unit.

[0043] The LDPC code encoding unit is used to perform LDPC code encoding on the information bits, and transmit the encoded signal to the repetition diversity unit.

[0044] The repetition diversity unit is used to repeat a plurality of coded signal copies, and transmit the same signals to the modulation unit.

[0045] The modulation unit is used for modulating multiple identical signals to obtain modulated signals and send them to the receiving end through a channel.

[0046] The demodulation unit is used to sense the signal frequency band interfered by narrowband noise on the frequency spectrum, and demodulate the received signal to obtain a de...

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Abstract

The invention relates to a system and a method for filling interference information based on a low-bit-rate LDPC code, in particular to a system and a method for realizing interference resistance in a strong interference system through LDPC code auxiliary interference information filling and diversity, and belongs to the field of digital signal processing. The anti-interference communication system comprises a repeated diversity unit, a modulation unit, a demodulation unit, a diversity receiving unit, an LDPC code decoding unit and an information replacement unit. Interference of high-power narrow-band noise is reduced in a mode of repeated sending at a sending end and diversity receiving at a receiving end; and the interference information in decoding soft information can be replaced through iterative updating among the LDPC code decoding unit, the information replacing unit and the diversity receiving unit so as to improve the decoding performance. Therefore, anti-interference covert communication is realized under the influence of high-power strong interference noise, and the reliability of a communication system is improved. The system has the advantages of strong anti-interference performance and good concealment.

Description

technical field [0001] The invention relates to a system and method for filling interference information based on low code rate LDPC codes, in particular to a system and method for realizing anti-interference in a strong interference system through LDPC code auxiliary interference information filling and diversity, and belongs to the field of digital signal processing. Background technique [0002] In practical applications, low-density parity-check code (LDPC) is a code pattern that is greatly affected by strong interference. The decoding performance will deteriorate drastically. In order to combat strong interference in the channel and realize error-free decoding, how to reduce the impact of high-power strong interference narrowband noise in the channel has become a very important issue in the application of LDPC codes. The existing technology usually uses a frequency-hopping spread-spectrum system to reduce narrow-band interference; the frequency-hopping system enables r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/1154
Inventor 安建平王帅蒙艳松
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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