Waveform Design for Wireless Powered and Backscatter Hybrid Communication System

For the waveform design and research of wireless powered and backscatter hybrid communication system, it is crucial to balance energy harvesting with ensuring communication rate performance. Considering the communication needs of traditional users in the hybrid communication system is particularly practical. In this paper, we study the model of wireless powered and backscatter hybrid communication system, while also taking the traditional orthogonal frequency division multiplexing (OFDM) user system into account. We jointly design the transmitting signal waveform and the backscatter signal waveform to ensure the communication performance of the traditional user while simultaneously enhancing the communication and energy transmission performance of the hybrid communication system. We maximize the signal-to-noise ratio (SNR) at the receiver by jointly optimizing the amplitude and phase of the transmitted signal waveform from the radio frequency (RF) source and the reflection coefficient of the backscatter device (BD). Furthermore, we use geometric programming methods to solve the problem. The simulation results confirm the effectiveness of the proposed scheme.