A Group Index Ofdm Communication Method Based on the Combination of Message and Random Sequence

A random sequence and communication method technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as poor anti-intercept performance, reduced anti-interference performance and spectral efficiency

Active Publication Date: 2021-05-14
HARBIN ENG UNIV
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Problems solved by technology

[0003] Aiming at the problem of poor anti-interception performance of the existing SIM-OFDM communication technology, the present invention provides a group index OFDM communication technology based on the combination of message and random sequence, which improves the system's anti-interference performance and spectrum efficiency without reducing the system's anti-interference performance. Anti-interception performance

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  • A Group Index Ofdm Communication Method Based on the Combination of Message and Random Sequence
  • A Group Index Ofdm Communication Method Based on the Combination of Message and Random Sequence
  • A Group Index Ofdm Communication Method Based on the Combination of Message and Random Sequence

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[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] It should be reminded that the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The invention relates to a group index OFDM communication technology based on the combination of a random sequence and a message, belonging to the technical field of wireless communication. The principle of packet SIM-OFDM communication technology based on the combination of random sequence and message is to use the combination of message drive and random sequence drive to activate some subcarriers of each carrier block in each OFDM symbol to transmit modulation symbols, and other subcarriers remain silent. State, using the randomness of a PN sequence causes the relationship between the index bit and the distribution of the active carrier to also change randomly, making the index bit information more concealed. The pres...

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Abstract

The invention belongs to the technical field of wireless communication, and in particular relates to a group index OFDM communication method based on the combination of message and random sequence. The principle of packet SIM-OFDM communication technology based on the combination of random sequence and message is to use the combination of message drive and random sequence drive to activate some subcarriers of each carrier block in each OFDM symbol to transmit modulation symbols, and other subcarriers remain silent. State, the group index OFDM communication technology based on the combination of message and random sequence uses the randomness of a PN sequence to cause the relationship between index bits and active carrier distribution to also change randomly, making the index bit information more concealed. In the joint driving mode of PN sequence and index bit, without sacrificing the spectral efficiency of the system, the anti-interception performance of the system is greatly improved without reducing the anti-interference performance.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a group index OFDM communication method based on the combination of message and random sequence. Background technique [0002] The existing SIM-OFDM communication technology is the main technology for the application of index modulation technology in the frequency domain. The index technology is introduced into the OFDM system. Compared with traditional OFDM, SIM-OFDM technology can enlarge the frequency domain transmission due to the scarcity of activated subcarriers. The distance between signals reduces the sensitivity of the system to frequency offset, and has a lower peak-to-average ratio. The introduction of index bit information can compensate for the loss of spectral efficiency caused by partial subcarrier silence. However, the disadvantage of the existing technology is that the index information bit controls the selection of activated subcarrier...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2601H04L27/2605
Inventor 孙志国严盼宁晓燕
Owner HARBIN ENG UNIV
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