UAV-Aided Transceiver Design for Secure Downlink OW-DFTs-OFDM System: A Multi-User mmWave Application

Unmanned aerial vehicle (UAV)-based communication system design has already attracted substantial interest due to UAV flexibility in deployment, cost effectiveness, and in-built line-of-sight air-to-ground channels. However, there is a persistent issue of security threats associated with the broadcast nature UAV: physical layer (PLS) can be introduced enhance secrecy performance that regard. In proposed here, combined effect 3D fractional-order Liu chaotic Li PLS UAV-to-ground network. addition, reduce multi-user interference (MUI), efficient orthogonal variable spreading factor (OVSF) codes are integrated zero forcing (ZF) scheme. Moreover, improve bit error rate (BER), MUI signal discrimination ZF detection scheme introduced, strengthened by various channel coding techniques beamforming weighting. The numerical outcomes establish efficacy terms improvement data signal-to-interference-plus-noise ratio. This approach achieved an out-of-band emission reduction 119 dB. Furthermore, improved BER $1 \times 10^{-4}$ 16-QAM for signal-to-noise ratio 6