Downlink secure transmission policy based on time reversal technology

Abstract

According to a secure transmission policy employing artificial noise, secrecy of a system can be greatly improved, while, energy is additionally consumed, and a life cycle of a whole wireless communication system is likely to be influenced. For a secure communication problem in a multiuser multiple input single output downlink system, the invention discloses a downlink secure transmission policy based on a time reversal technology. The time reversal technology is employed in the multiuser multiple input single output (MISO) downlink system. The secrecy performance of the system is improved through utilization of space-time focusing. The fact that secrecy signals of auxiliary artificial noise interference signals consume the energy additionally is taken into consideration, so an energy consumption problem is effectively solved through importing of an SWIET (simultaneous wireless information and energy transfer) technology, and system security performance is improved. Theoretical analysis and simulation results show that the provide policy is relatively high in secrecy capacity and is relatively low in information leakage quantity.

Description

technical field [0001] The invention relates to the field of wireless communication security, in particular to a downlink security transmission strategy based on time reversal technology. Background technique [0002] The wireless communication system is broadcast, which provides an opportunity for eavesdropping users. The traditional wireless communication system mainly relies on the upper layer encryption protocol system to ensure that the eavesdropping users cannot steal any confidential information through encryption, decryption, authentication and other technologies for information. This encryption method assumes that the algorithm is complex enough that it takes longer for eavesdropping users to decipher the encrypted information than the effective time of the information, but with the rapid improvement of computer computing power, it can no longer meet people's requirements for future wireless communication security. Therefore, the research on secure communication of...

AI Technical Summary

Problems solved by technology

Although the existing literature introduces SWIET technology to effectively solve the energy consumption problem of the secure transmission strategy using artificial noise, it does not explore the introduction of SWIET technology to solve the energy consumption of the combination of time reversal technology and artificial noise in the multi-user MISO downlink system. question

[0006] Using artificial noise (AN) security transmission strategy will greatly improve the confidentiality of the system, but it will consume extra energy, which may affect the life cycle of the entire wireless communication system

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