Power Allocation Method using Pilot Signal for Simultaneous Transmission of Power and Information

In this paper, a method for simultaneously transmitting power and information using subcarrier allocation is proposed. The proposed scheme allocates the specific subcarriers which transmit power signals having a large energy in the orthogonal frequency division multiplexing system. Therefore, information signals can be loaded on subcarriers except power transmission subcarriers, so that information and power can be simultaneously transmitted in the same time and frequency domain. Because the transmitted power signals are located at specific subcarriers and have a constant power, the power signals can be used as pilot signals which supports a function such as channel estimation. To verify the performance of proposed scheme, we implemented a power transfer system with multiple RF antennas and a rectenna, and made an information transfer system using software defined radio equipment and Gnuradio software. Then, we confirmed the possibility of simultaneous transmission of information and power through the implemented test system.