Anti-interference method based on combined N-ary spread spectrum and multi-carrier modulation

A multi-carrier modulation and multi-system technology, applied in modulation carrier system, multi-frequency code system, forward error control and other directions, which can solve the problems of inability to transmit high-speed information and low spectrum utilization of direct sequence spread spectrum technology. , to achieve fast and effective anti-interference ability, improve anti-interference ability, and save bandwidth.

Active Publication Date: 2018-11-30
NORTHWESTERN POLYTECHNICAL UNIV +1
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Problems solved by technology

[0005] In order to solve the problem of low spectrum utilization rate and inability to transmit high-speed information of direct sequence spread spectrum technology, the present invention proposes a method that combines multi-ary system spr

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  • Anti-interference method based on combined N-ary spread spectrum and multi-carrier modulation
  • Anti-interference method based on combined N-ary spread spectrum and multi-carrier modulation
  • Anti-interference method based on combined N-ary spread spectrum and multi-carrier modulation

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[0031] The present invention will now be further described in conjunction with the embodiments and drawings:

[0032] Here we take four channels of information transmitted in parallel at high speed, 32 hexadecimal, and m-sequence cyclic shift sequence with a spreading code length of 127 as an example.

[0033] 1. Encoding and interleaving the signal

[0034] First, use the randi function in MATLAB to generate a string of random arrays of 0 and 1 as the source, denoted as S; secondly, use 1 / 2 convolutional coding to perform error correction coding on the signal to improve the anti-interference ability of the system, and use convenc here. Function to achieve this function, the signal at this time is marked as S 1 ; Finally, in order to prevent burst interference, the interleaving technology implemented by the matintrlv function is used to scramble the order of the information symbols to be sent at the transmitting end to achieve the purpose of separating a large number of consecutive e...

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Abstract

The invention relates to an anti-interference method based on combined N-ary spread spectrum and multi-carrier modulation. Through utilization of an N-ary spread spectrum technology, anti-interferenceperformance of unmanned aerial vehicle data links in a complex electromagnetic environment is improved. Through utilization of a multi-carrier technology, multichannel high speed transmission of information is realized. A result shows that according to the method, the anti-interference performance of the unmanned aerial vehicle data links in the complex electromagnetic environment can be effectively improved

Description

technical field [0001] The invention belongs to the technical field of unmanned aerial vehicles, and relates to an anti-interference method for an unmanned aerial vehicle data link, which is applied to research the anti-interference performance of an unmanned aerial vehicle data link by combining multi-ary system spread spectrum and multi-carrier modulation. This is a method that uses multi-ary spread spectrum technology to improve the anti-interference performance of the UAV data link in a complex electromagnetic environment, and uses multi-carrier technology to achieve multi-channel high-speed transmission of information. The results show that this method can effectively improve the anti-jamming performance of UAV data link in complex electromagnetic environment. Background technique [0002] At present, the complex electromagnetic environment formed by information warfare has become a bottleneck problem restricting the combat effectiveness of UAVs. The UAV data link using...

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Application Information

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IPC IPC(8): H04L1/00H04B1/7097H04B1/71H04L27/26
CPCH04B1/7097H04B1/71H04L1/004H04L1/0054H04L1/0059H04L1/0071H04L27/2627H04L27/2649
Inventor 郭淑霞黄方慧宋哲
Owner NORTHWESTERN POLYTECHNICAL UNIV
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