Wireless interference network secure transmission method based on interference alignment and artificial noise

Abstract

The invention belongs to the field of wireless communication, and particularly relates to a wireless interference network secure transmission method based on interference alignment and artificial noise, which comprises the following steps: constructing an interference alignment system comprising K pairs of legal transceivers and T single-antenna eavesdropping nodes, sending a useful signal and an artificial noise signal by a sending end r, and only sending the useful signal by other sending ends; aligning the interference signal and the artificial noise signal to an interference subspace by adopting an alternating minimization interference alignment algorithm; calculating the signal-to-noise ratio of the receiving end r and the signal-to-noise ratios of the T eavesdropping nodes after interference alignment, and constructing an objective function for optimizing the power distribution coefficient and the safety outage probability of the transmitting end r; the objective function is analyzed through a numerical method to obtain an optimal power distribution coefficient, and wireless interference network secure transmission under the optimal secure outage probability is achieved; the alternating minimization interference alignment algorithm can be applied to TDD and FDD systems at the same time, has wider applicability, and realizes flexible distribution of useful signal and AN signal power.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a wireless interference network security transmission method based on interference alignment and artificial noise. Background technique [0002] The important indicators to measure the performance of wireless communication systems are reliability, effectiveness, security, etc. Interference is a key factor affecting these important indicators. On the one hand, interference will affect the receiving quality of the legitimate receiver, thereby reducing the effectiveness and reliability of the system. On the other hand, interference can affect the potential eavesdropping nodes in the wireless communication network to a certain extent, thereby indirectly improving the reliability of the system and improving the security transmission of the system. Therefore, how to use the interference in the wireless communication network to improve the performance of the communicati...

AI Technical Summary

Problems solved by technology

Since the transmission system needs to generate additional artificial noise, this will add new constraints to the interference alignment network, thereby changing the interference alignment conditions

"Anti-Eavesdropping Schemes for Interference Alignment (IA)-Based Wireless Networks" analyzed the feasibility conditions after adding artificial noise to the interference alignment network, and improved the minimum algorithm based on the interference leakage (Leakage Minimization, LM), But the article does not make flexible adjustments to the power allocation between the useful signal and the AN

"Joint Secure Transceiver Design and Power Allocation for AN-assisted MIMONetworks" proposed the use of joint optimized interference alignment network interference and artificial noise transceiver precoding matrix to solve the problem of power allocation between useful information and artificial noise, but the The optimization problem of the article does not consider the influence of the unknown Channel State Information (CSI) of the eavesdropping node

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