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A Group Index Ofdm Communication Method Based on Random Sequence

A communication method and random sequence technology, which is applied in the field of OFDM communication based on random sequence grouping index, can solve the problems of poor anti-interception performance and reduced anti-interference performance, and achieve the effect of strong anti-interception ability

Active Publication Date: 2021-03-30
HARBIN ENG UNIV
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Problems solved by technology

[0003] The present invention aims at the problem of poor anti-interception performance of the existing SIM-OFDM communication technology, and provides an index OFDM communication method based on random sequences, which can improve the anti-interception performance of the system without reducing the anti-interference performance of the system

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  • A Group Index Ofdm Communication Method Based on Random Sequence
  • A Group Index Ofdm Communication Method Based on Random Sequence
  • A Group Index Ofdm Communication Method Based on Random Sequence

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Technical scheme of the present invention is:

[0031] Different random sequences are used to activate the subcarriers of each carrier block in each OFDM symbol, and the random sequence that controls the activation of subcarriers in each OFDM symbol is determined by the index bits. The randomness of the random sequences and the differences between them make The relationship between the index bit and the distribution of active carriers is more complicated, which also makes the index bit information more concealed. At the system transmitter, the information source bits are divided into two parts, one part is used as signal modulation bits, which are divided into constellation point symbols mapped to M-ary system; the other part is used as index bits, which are used to select a random sequence from the random sequence set, and use the random sequence The driving m...

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Abstract

The invention belongs to the technical field of wireless communications, and specifically relates to a grouped index OFDM communication method based on random sequences. The principle of a grouped index OFDM communication technology based on the random sequences is to use different random sequences to activate partial subcarriers in each carrier block in each OFDM symbol to transmit modulation symbols, and other subcarriers are kept in a silent state. Random sequences for controlling each OFDM symbol activated subcarrier are determined by index bits, and the randomness of the random sequencesand the difference between the random sequences enable a relation between the index bits and the activated carrier distribution to be more complicated, so that the index bit information is more hidden. According to the grouped index OFDM communication method based on the random sequences provided by the invention, the activation of the subcarriers is realized by means of random sequence driving, compared with the grouped index OFDM communication technology, a PN sequence is introduced, which greatly improves the anti-intercept performance of a system without reducing the anti-interference performance of the system, and the grouped index OFDM communication method has a great application value in military and civil communications.

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 a random sequence. Background technique [0002] The existing group index OFDM, that is, SIM-OFDM, is a communication technology that combines index modulation technology with OFDM technology. At the system transmitter, the information bits are divided into G groups. In each group, the information bits are divided into two parts, and one part is used as a signal Modulation bits are mapped to M-ary constellation point symbols; a part is used as index information bits, and some subcarriers are selected to be activated in each group of subcarriers to transmit constellation point symbols, and other subcarriers are set to 0 to achieve a message-driven indexing method Realize the activation of subcarriers. The disadvantage of the prior art is that there is a certain direct law between the index bits and the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/02H04L5/00
CPCH04L5/0021H04L5/026
Inventor 孙志国严盼宁晓燕
Owner HARBIN ENG UNIV