A signal transmission method, device and system

Abstract

The embodiment of the invention discloses an information transmission method, device and system; wherein a relay device can receive a first signal sent by a signal sending device; when judging that the relay device is a forwarding relay device, a second signal is generated according to the first signal; when an interference relay device sends a second interference signal, the second signal is sent to a signal receiving device at the same time; when judging that the relay device is a non-forwarding relay device, whether the value of the determinant of the channel response matrix between the relay device and the signal receiving device is more than the value of the determinant of the channel response matrix between another non-forwarding relay device and the signal receiving device is judged; and if so, when the forwarding relay device sends the second signal, the preset second interference signal is sent to the signal receiving device at the same time. In application of the invention, the calculation complexity of demodulating the second signal by the signal receiving device can be reduced; the signal transmission process can be simplified; and moreover, the security of transmitting the second signal to the signal receiving device by the relay device can be ensured.

Description

technical field [0001] The present invention relates to the technical field of wireless communication systems, in particular to a signal transmission method, device and system. Background technique [0002] Multiple-input-multiple-output (MIMO) wireless communication system has become a new generation of wireless communication due to its good anti-fading performance, low bit error rate, high channel capacity level and faster data transmission rate. an important technology. [0003] However, while paying attention to the effectiveness and reliability of wireless communication systems, the security of wireless communication cannot be ignored. Due to the openness of the transmission medium of the wireless communication system, the mobility of the wireless terminal, and the diversity and variability of the topology of the wireless communication network, the security threats to the wireless communication system are more severe than those of the wired communication system compare...

AI Technical Summary

Problems solved by technology

The destination node uses the reverse synchronization to send the training sequence, so that the source node can estimate the channel information between the source node and the destination node. This reverse synchronization can prevent the eavesdropping node from estimating the channel information between the eavesdropping node and the source node. Blindly estimate the transmitted signal, thus increasing the complexity of eavesdropping on the signal transmitted by the source node

Although this strategy does not need to know the CSI from the sender to the eavesdropper in advance, however, since the random encoder needs to rely on the actual input signal for encoding, this strategy makes the destination receiver more complicated

[0007] It can be seen that the existing wireless communication security technology based on the physical layer is cumbersome, complicated, and poor in practicability

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