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A secure transmission method of index modulation OFDM based on random mapping

A technology of index modulation and orthogonal frequency division, applied in the field of index modulation orthogonal frequency division multiplexing secure transmission

Active Publication Date: 2021-08-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing research on OFDM-IM focuses on how to improve spectral efficiency and design low-complexity receivers, and seldom involves system security

Method used

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  • A secure transmission method of index modulation OFDM based on random mapping
  • A secure transmission method of index modulation OFDM based on random mapping
  • A secure transmission method of index modulation OFDM based on random mapping

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] The system adopted in the present invention is a three-node model, i.e. source node (N t root antenna), the destination node (N r root antennas) and eavesdropping nodes (N e root antenna). System works under the time division duplex (TDD) mode, and this method comprises the following steps:

[0040] It is assumed that an OFDM system includes N subcarriers divided into g groups, and each group includes L subcarriers, that is, N=Lg. The bandwidth of the system is B T , then the subcarrier spacing B S =B T / N. For each transmission, the source node sends B-bit information, and there are only m active sub-carriers in each group of L sub-carriers, that is, the total number of active sub-carriers in the system is mg. Therefore, to activate subcarrier index part transmission bit information, and gmlog 2 The (M) bits of information are used to map o...

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Abstract

An index modulation OFDM secure transmission method based on random mapping. The multi-antenna index modulation OFDM system is a three-node model composed of a source node, a destination node and an eavesdropping node, specifically including the following Steps: In the first step, the source node and the destination node sequentially send training sequences to estimate the equivalent channel information of the source-destination node; in the second step, the source node selects the corresponding activation Transmit antenna; Step 3: Select the group of activated subcarriers according to the channel gain ranking state of the system subcarrier group; Step 4: Select the constellation mapping method of the transmission symbols on the subcarriers according to the channel gain ranking of each group of activated subcarriers ; The fifth step, the destination node correctly decodes the source information; but the eavesdropper cannot correctly decode the source information. The present invention obtains a traversal secrecy rate greater than 0 and realizes safe transmission.

Description

technical field [0001] The invention belongs to the technical field of physical layer security of a wireless multiple-input multiple-output system, and in particular relates to a random mapping-based index modulation orthogonal frequency division multiplexing secure transmission method. Background technique [0002] Multiple-input multiple-output technology transmits multiple data streams while activating all available antennas at the transmitting end, and selects an appropriate precoding matrix to achieve information multiplexing or transmit diversity gain, which can provide higher system capacity and system spectrum efficiency. Orthogonal frequency division multiplexing (OFDM) is an improvement to traditional multi-carrier modulation. It decomposes the data stream into several lower bit rate sub-data streams to modulate the corresponding sub-carriers to form multiple low-rate symbols in parallel. The transmission system sent. Its characteristic is that each subcarrier is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06H04B7/08H04L25/02H04L27/26H04B7/0413
CPCH04B7/0413H04B7/0608H04B7/0808H04L25/0224H04L27/2601H04L27/2626H04L27/2647
Inventor 高贞贞申迪廖学文
Owner XI AN JIAOTONG UNIV