Preliminary Evaluation of Simultaneous Data and Power Transmission in the Same Frequency Channel

Combining wireless transmission of data and power signals enables us to use wireless devices without charging batteries. To improve the utilization of wireless resources, a sender could simultaneously transmit data and power signals in the same frequency channel. A disadvantage of simultaneous transmission is that it induces interference between data and power signals. To minimize the effect of interference, we propose a new frequency-sharing system. The proposed system makes two contributions. The first contribution is interference cancellation of the power signal to receive data from the collided signal using a combination of digital and analog interference cancellation techniques. The second contribution is a media access control protocol to receive the transmitted power effectively by varying the sleep time. To evaluate the performance of the proposed system, we built an experimental apparatus using software-defined radio. Evaluations show that it is feasible to transmit data and power simultaneously using the proposed system.