Power Amplifier Design for 25.1km Long-distance Transmission under 214km/h High-speed Movement of Air-to-ground Wireless Self-assembled Network Nodes

In this paper, we design a power amplifier for this network protocol to combat the Doppler effect caused by the high-speed movement of network nodes and the rapid signal fading failure caused by the long-distance transmission of network nodes, and to extend the communication distance between network nodes, to realize the long-distance transmission under the high-speed movement of network nodes. The overall design of the power amplifier for bi-directional transmission structure, power amplifier transmitter, and low-noise amplifier receiver is used in a four-stage cascade current series negative feedback structure mode, where the signal transmitter selected RFPA5208 and MAX4003 chip, the signal receiver selected TQP3M9037 and SKY16602 chip. The above overall design enables the self-assembled nodes to ensure stable topology and achieve long-spacing transmission even in the high-speed mobile state. The test results show that the output power is 41.5dBm-44.3dBm, the gain is 44dB-45dB, and the noise is 1.6dB when the frequency band range is 2.4GHz-2.5GHz. The experimental results show that when the self-assembling nodes maintain the relative speed of 214km/h, the longest transmission distance of the point-to-point of the amorphous flat terrestrial wireless self-assembling network reaches 16300m, and the longest transmission distance of the point-to-point of the amorphous flat air-to-ground wireless self-assembling network reaches 25100m. The power amplifier designed in this paper has good application value. It provides an individual research basis for future research on the framework of a low-altitude economic fly-by-wire network.