Simultaneous Wireless Information and Power Transfer Based on Symbol Allocation for GFDM-NOMA Cooperative Communications

In this letter, a simultaneous wireless information and power transfer (SWIPT) enabled generalized frequency division multiplexing based non-orthogonal multiple access (GFDM-NOMA) cooperative communication model is proposed to guaranteed the transmission performance of the source while saving the power consumption of the relay. The GFDM subsymbols in two phases are both divided into two sets. In the first phase, the relay utilizes two different subsymbol sets to decode the source information and harvest the source energy, respectively. In the second phase, the relay uses the paired subsymbols to transmit the source information to the destination and the relay information to the relay’s receiver simultaneously by NOMA, and utilizes the remaining subsymbols for the transmissions between the relay and the relay’s receiver. The sum system rate is maximized through a joint optimization algorithm for subsymbol and power allocations. Simulation results show that the proposed scheme has better performance.