Unmanned aerial vehicle backscatter communication method based on time modulation array

Abstract

The invention provides an unmanned aerial vehicle backscatter communication method based on a time modulation array, and belongs to the technical field of unmanned aerial vehicle wireless communication. A time-frequency full-duplex time modulation antenna array FD-TMA is arranged on the unmanned aerial vehicle, and an SPMT switch and an SPDT switch in the FD-TMA are combined, so that receiving and transmitting radio frequency chains are isolated while receiving and transmitting antennas are shared; local self-interference is suppressed by adjusting the phase angle of a phase shifter in the FD-TMA in the unmanned aerial vehicle and the modulation time sequence of the transceiving state of an antenna array element; when the unmanned aerial vehicle communicates with the BD, the maximum gain direction of the fundamental frequency component is aligned with the BD, and then a radio frequency signal is sent; the unmanned aerial vehicle modulates the received signal through FD-TMA and then obtains a BD sending signal through a low-pass filter. According to the invention, the receiving and transmitting radio frequency chains are isolated by using the radio frequency switch network, the self-interference signal suppression is realized, and the data collection application requirements of a large number of backscatter communication devices BD in the Internet of Things are met.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to wireless simultaneous and same-frequency full-duplex communication technology and backscatter communication technology, in particular to a UAV simultaneous and same-frequency full-duplex backscattering communication technology based on a time modulated array (Time modulated array, TMA). Scatter communication method. Background technique [0002] With the rapid development of wireless communication technology and sensing technology, sensors with perception, computing and wireless communication capabilities have emerged. The wireless sensor network is composed of the above-mentioned large number of sensor nodes in a multi-hop and self-organizing manner, which can realize cooperative perception and collection of information data in the monitored area, and process and transmit the data, so that people can get valuable information. Wireless sensor nodes have the characteristics of...

AI Technical Summary

Problems solved by technology

[0006] However, the current UAV duplex technology has insufficient research on UAV self-interference elimination methods, and most of the existing UAV full-duplex communications have not designed self-interference suppression

In addition, there are many limitations in the current self-interference suppression scheme: for example, the interference suppression performance of antenna zeroing is weak, the reflection surface suppression is not conducive to miniaturization, radio frequency self-interference suppression is affected by the inconsistency of transmission and reconstruction links, digital self-interference suppression There are transmit power constraints and active device nonlinearities

In addition, interference elimination requires additional radio frequency links and complex calculations, which is not suitable for UAVs with limited load and computing power.

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