Ambient Backscatter Communication Symbiotic Intelligent Transportation Systems: Covertness Performance Analysis and Optimization

With the continuous integration of wireless communication and intelligent information technologies, Internet of Vehicles (IoV) technology has been widely used in Intelligent Transportation Systems (ITS). Unfortunately, it is still facing challenges such as spectrum scarcity, environmental restrict and transportation data leakage. Motivated by this, we propose an ambient backscatter communication (AmBC) symbiotic ITS. To evaluate the system performance, we derive the expressions in terms of detection error probability, outage probability (OP), effective covert rate (ECR) and energy efficiency (EE). In addition, the asymptotic analysis of the OPs in the high signal-to-noise ratio (SNR) is performed. Simulation results verify the analysis and prove that: {i} ) increasing the number of transmitting antennas significantly reduces the OPs of vehicles and backscatter device; ii) the maximum ECR is obtained by optimizing the power allocation factor, and it first increases with the vehicle's maximum transmit power, and then converges to a constant; iii) the multi-antenna selection scheme can significantly improve covertness performance and EE.