Towards Optimal Power Splitting in Simultaneous Power and Information Transmission

Simultaneous wireless information and power transfer (SWIFT) offers novel designs that could enhance the sustainability and resilience of communication systems. Due to the very limited receiving power from radio frequency (RF) signals, optimal splitting strategies play an essential role for many SWIFT systems. This paper investigates optimal power splitting from the outage perspective by formulating the power, information and joint outage performance using a Markov chain, and studying the boundary conditions for achieving an energy-neutral state. Our results show that: 1)the power splitting factor is the key factor of intrinsic trade-off between power and information outage; and 2) the proposed polynomial method can obtain the optimal power splitting factor which leads to the minimum joint outage probability.