Grouping index OFDM communication method based on combination of message and random sequence

A technology of random sequence and communication method, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve the problems of reducing anti-interference performance, spectrum efficiency, poor anti-interception performance, etc., and achieve the effect of improving anti-interception performance

Active Publication Date: 2019-03-19
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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  • Grouping index OFDM communication method based on combination of message and random sequence
  • Grouping index OFDM communication method based on combination of message and random sequence
  • Grouping index OFDM communication method based on combination of message and random sequence

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Embodiment Construction

[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 the packet SIM-OFDM communication technology based on the combination of random sequence and message is to activate some subcarriers of each carrier block in each OFDM symbol to transmit modulation symbols by using a combination of message drive and random sequence drive, while 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. Th...

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Abstract

The invention belongs to the technical field of wireless communication, specifically relates to a grouping index OFDM communication method based on combination of a message and a random sequence. Theprinciple of grouping SIM-OFDM communication technology based on the combination of the random sequence and the message is to activate the partial subcarrier transmission modulation symbols of each carrier block in each OFDM symbol by using the combination of message driving and random sequence driving, and the other subcarriers remain silent. The grouping index OFDM communication method based onthe combination of the message and the random sequence utilizes the randomness of a PN sequence, which results in a random change in the relationship between an index bit and an activated carrier distribution, so that the index bit information is more concealed. In the combined driving mode of the PN sequence and the index bit, the anti-interception performance of the system is greatly improved without sacrificing the spectral efficiency of a system and 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 Applications(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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