System and Design for Selective OFDM SWIPT Transmission

Signal Conditioning for Selective OFDM SWIPT Systems

“…Contrary to other work, however, the current solution takes advantage of the use of the CP and selective portion of the information signal received and further leverages the use of signal conditioning. As such, the selective system introduced achieves full sustainability even at 2m, whereas without conditioning, sustainability was possible at distances under 1.4m [24]. Accordingly, we can conclude with confidence that the inclusion of signal excitation is a beneficial add to an OFDM system with SWIPT transmission.…”

“…The coreceiver architecture includes a dynamic switch used for joint energy harvesting and information decoding. The notation throughout this section is kept in agreement with our previous work in [10], [24] for consistency.…”

“…Accordingly, the inequalities are designed to include constraints on the system that will ensure enough energy is harvested to provide the processing power needed to perform the information decoding in the selective OFDM system. Now because the selective system in this paper has been enhanced with signal excitation, the optimization problem introduced in our prior work [24] has to be extended to account for such, as used by the selective OFDM system with SWIPT transmission. As such, the optimization problem starts off with a first constraint which accounts for energy harvested from the CP (r CP ) and portion of the information signal used for harvesting (r EH ), as well as from the conditioning signal (r c ) introduced at the receiver.…”

“…2. Notice that other feasible solutions exist, however have shown to under perform with respect to achieving system self-sustainability [9], [24]. Also, note that in consideration the constraints and limitations imposed, the goal of this solution is not to identify an optimal transmission strategy via the numerical algorithm but rather understand the optimal transmission strategy through the numerical analysis and results presented in the systems analysis section in this paper.…”

“…For the analysis, we consider a point-topoint transmission with a center frequency of 915MHz with a transmit power P t = 36dBm. Like in [24], the selective OFDM receiver includes an isotropic antenna with 25dBi receive antenna gain and attenuation factor n = 2. Receiver front-end losses are incorporated in the Friis transmission analysis, as are the switching and harvesting losses, which were modeled by a 1µW loss and a conversion efficiency of η = 50% [50].…”