A signal security transmission method of mimo amplification and forwarding relay network

Abstract

The invention provides a signal safe transmission method of an MIMO amplifying forwarding relay network. According to the method, in the process of designing a precoding matrix, the GSVD-ZF-SVD joint strategy is adopted to parallelize a system, the expression mode of the safety speed of the system is simplified, and an optimization problem is solved under power constraint; in the power distribution process, the non-convexity of the original problem makes direct solutions difficult to work out, each sub-problem can have the only optimal solution due to the adoption of alternating iteration and optimization, and a point of convergence can be finally obtained through alternating iteration. In the method, joint precoding of a sending node end and a relay node is considered, channels are parallelized through the GSVD-ZF-SVD method, and therefore problem analysis is simplified. Power distribution is optimized. Calculation complexity is small.

Description

technical field [0001] The invention belongs to the technical field of wireless transmission, in particular to a signal security transmission method of a MIMO amplification and forwarding relay network. Background technique [0002] Security is a fundamental problem in wireless communication. The openness of the wireless medium brings greater challenges to security. The physical layer security technology of wireless communication is a new wireless signal security transmission technology. It does not rely on the use of key encryption to achieve secure data transmission, but through reasonable design of signals, power distribution, and modulation and coding methods to improve the security rate of signal transmission and prevent information from being eavesdropped by eavesdroppers, thereby improving the security of information transmission . In recent years, wireless physical layer security has received great attention from academia. [0003] Multiple-input multiple-output ...

AI Technical Summary

Problems solved by technology

The decoding and forwarding scheme requires the relay node to decode the information, which increases the complexity of the system, and at the same time increases the delay of the system, and the relay node must also ensure correct decoding

[0005] Liu Yang, Song Mei, Zhang Yong and others mentioned the issue of relay security in the invention patent "Wireless Relay Security Forwarding Method Based on Layered Modulation", but did not consider the use of MIMO technology. In addition, the inventors also considered the following node to decode

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