Design and Implementation of a Novel MSK-based Frequency-Domain SWIPT Multiplexing Scheme

In this paper, we propose a novel frequency-domain simultaneous wireless information and power transfer (FD-SWIPT) waveform which allows for rectifiers based on local oscillators (LO) and eliminates the need for receive (demultiplexing) filters. This is achieved via appropriate multiplexing a multitone energy signal with a minimum shift keying (MSK) data signal. We analytically derive the average error probability for a point-to-point link in the presence of i.i.d. Rayleigh fading, additive white Gaussian noise, and multitone interference. The performance of the proposed waveform is evaluated via numerical simulations, assuming either a LOs-based receiver or a power splitting (PS)-based one for comparison purposes. The simulation results show that the proposed scheme substantially increases both the data rate and the harvested energy in comparison with conventional PS-SWIPT at the cost of negligible performance loss in data detection. Finally, the proposed concept is experimentally validated in a realistic indoor propagation environment.