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Code domain index modulation method for covert communication

An index modulation and covert communication technology, which is applied in the field of code domain index modulation of covert communication, can solve the problems of vulnerability to attack, high computational complexity, and large overhead

Active Publication Date: 2021-02-09
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, this security technique generally suffers from the limitations of high computational complexity and high overhead
Also, with the advent of powerful computing devices, they become vulnerable to

Method used

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  • Code domain index modulation method for covert communication
  • Code domain index modulation method for covert communication
  • Code domain index modulation method for covert communication

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Embodiment Construction

[0060] Below in conjunction with accompanying drawing and simulation example, the practicability and effectiveness of the present invention are illustrated:

[0061] Computer simulations of QPSK modulation on an AWGN channel. In the receiver, ML detection is used to determine the interleaver index and spreading code index. The signal-to-noise ratio is defined as SNR (dB) = 10log 10 (E b / N 0 ),in is the average energy and χ is the number of bits of a symbol; in addition, the interleaver only changes the permutation order to E b No effect, use spreading code Normalize, so that the transmission power remains unchanged when K=32 is simulated. This technology uses the interleaver index to transmit 2 bits, the spreading code index to transmit 2 bits, and the QPSK symbol to transmit 2 bits. On the premise of using an orthogonal interleaver, the performance of the system is analyzed by changing the type of spreading code.

[0062] figure 2 It is a schematic diagram of com...

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Abstract

The invention belongs to the technical field of novel physical layer security, particularly provides a code domain index modulation method for covert communication, relates to theoretical knowledge frameworks such as covert communication, index modulation, spreading codes and interleavers, and aims to realize information hiding by researching and utilizing indexes of interleaving codes and spreading codes. Specifically, firstly, a communication framework is designed and provided and comprises a spreading code interleaver selector and a spreading code interleaver detector; then proposing to optimize the performance of the system by utilizing the characteristics of the spreading code and the interleaver in the framework so as to improve the achievable bit error rate; difference between the system and a traditional communication system is considered, and a support vector machine (SVM) is used for expanding a receiving end detection part. On the whole, compared with a traditional coding wireless communication system, the error code performance of the system can be remarkably improved. In addition, it is found that the scheme can achieve effective hidden transmission, and the method isan attractive information hiding technology.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a code domain index modulation method for covert communication. Background technique [0002] In wireless communication networks, the covert transmission of information is a key research issue. In traditional secure communication schemes, the transmission of confidential information mainly depends on the upper-layer key-based encryption technology. However, this security technique generally suffers from the limitations of high computational complexity and high overhead. Furthermore, with the advent of powerful computing devices, they become vulnerable to attack. In order to solve this problem, physical layer security technology has attracted people's attention because of its remarkable performance in enhancing information security. This technology mainly uses the dynamic characteristics of wireless communication, such as random channels, noise and interference, t...

Claims

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Application Information

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IPC IPC(8): H04L27/34H04L1/00
CPCH04L1/0071H04L27/3405H04L27/3483
Inventor 尧希李泳洋杨平肖悦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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