Wireless Information and Energy Provision with Practical Modulation in Energy Self-Sustainable Wireless Networks

Due to its long-distance propagation, radio-frequency (RF) signals have been relied upon for remotely charging low-power communication devices, which significantly extends the lifetime of battery-powered devices. Delivering both wireless information provision (WIP) and wireless energy provision (WEP) services in the RF band requires a holistic design of wireless information and energy provision (WIEP) for achieving energy self-sustainability in the next generation of wireless networks, such as 6G. However, most of the existing works studied the integrated WIEP performance by exploiting Gaussian distributed signals with the infinite alphabet, which cannot be realised in a practical communication system. Therefore, we investigate the WIEP performance by considering practical modulation schemes having finite alphabet in a well-known Nakagami-m wireless fading channel. Furthermore, we jointly optimise the transmit power allocation and the transmission switching threshold of a WIEP transmitter and the power splitting ratio of a WIEP receiver in order to maximise the attainable spectrum efficiency for WIP, while satisfying both the WEP requirement and the WIP reliability constraint. Numerical results are provided for characterising the rate-energy-reliability trade-off of different modulation schemes in various wireless fading conditions.