A UAV Backscatter Communication Method Based on Time Modulation Array

Abstract

The invention provides a UAV backscatter communication method based on a time modulation array, which belongs to the technical field of UAV wireless communication. In the present invention, a time-frequency full-duplex time-modulated antenna array FD-TMA is set on the UAV, and by combining the SPMT switch and the SPDT switch in the FD-TMA, the transceiver antenna is shared while the transceiver radio frequency chain is isolated; by adjusting The phase angle of the phase shifter in the FD-TMA in the UAV and the modulation timing of the receiving and receiving state of the antenna element suppress local self-interference; when the UAV communicates with the BD, the maximum gain direction of the fundamental frequency component is aligned with the BD Send radio frequency signal; the UAV modulates the received signal by FD-TMA and then obtains the BD sending signal through a low-pass filter. The invention realizes the use of a radio frequency switch network to isolate the transceiver radio frequency chain, realizes self-interference signal suppression, and satisfies the data collection application requirements of a large number of backscatter communication devices BD in the Internet of Things.

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...

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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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