Title | ||
---|---|---|
Resource Allocation for Wireless-Powered Full-Duplex Relaying Systems With Nonlinear Energy Harvesting Efficiency |
Abstract | ||
---|---|---|
In wireless power transfer (WPT)-assisted relaying systems, spectral efficiency (SE) of source-relay link plays a dominant role in system SE performance due to the limited transmission power at the WPT-aided relay. In this paper, we propose a novel protocol for a downlink orthogonal frequency division multiple access (OFDMA) system with a WPT-aided relay operating in full-duplex (FD) decode-and-forward (DF) mode, where the time slot durations of the source-relay and relay-users hops are designed to be dynamic, to enhance the utilization of degrees of freedom and hence the system SE. In particular, a multiple-input and signal-output (MISO) source-relay channel is considered to satisfy the stringent sensitivity of the energy harvesting (EH) circuit at the relay, while a single-input and single-output (SISO) relay-user channel is considered to alleviate the power consumption at the relay node. Taking into account the non-linearity of EH efficiency, a near-optimal iteration-based dynamic WPT-aided FD relaying (A-FR) algorithm is developed by jointly optimizing the time slot durations, subcarriers, and transmission power at the source and the relay. Furthermore, self-interference generated at the relay is utilized as a vital energy source rather than being canceled, which increases substantially the total energy harvested at the FD relay. We also reveal some implicit characteristics of the considered WPT-aided FD relaying system through intensive discussions. Simulation results confirm that the proposed A-FR achieves a significant enhancement in terms of SE with different relay's locations and the number of users, compared to the conventional symmetric WPT-aided FD relaying (S-FR) and the time-switching-based WPT-aided FD relaying (TS-FR) benchmarks. |
Year | DOI | Venue |
---|---|---|
2019 | 10.1109/TVT.2019.2948792 | IEEE Transactions on Vehicular Technology |
Keywords | DocType | Volume |
Relays,Protocols,Interference cancellation,Resource management,Wireless communication,Energy harvesting,Wireless sensor networks | Journal | 68 |
Issue | ISSN | Citations |
12 | 0018-9545 | 3 |
PageRank | References | Authors |
0.37 | 0 | 5 |
Name | Order | Citations | PageRank |
---|---|---|---|
Zhongxiang Wei | 1 | 23 | 3.71 |
Sumei Sun | 2 | 1276 | 144.61 |
xu zhu | 3 | 51 | 10.32 |
Dong In Kim | 4 | 3784 | 220.90 |
Derrick Wing Kwan Ng | 5 | 3588 | 189.08 |