A Sum-Rate Maximum Design of Transceiver and Relay for SWIPT Systems
Simultaneous Wireless Information and Power Transfer (SWIPT) system is considered in this paper, where the relay has no fixed power supply and thus needs to be charged by the source. We propose a new joint design of transceiver and relay architecture in terms of maximum sum-rate performance. We first propose a novel scheme for energy-constraint relay to harvest energy, when relay knows channel state information and each relay receives power or information judging by a certain threshold. For the proposed scheme we investigate the trade-off of information rate and energy harvest. When the relay transfer information, its power have to be subjected to the collected energy. Then we transfer the problem of sum-rate to the problem of minimum mean square error (MSE) and propose a low-complexity calculating algorithm to calculate joint precoding of transceiver and relay based on a duality relationship. By simulation, we show that the proposed scheme has a better trade-off when compared to traditional periodic switching scheme, and the proposed algorithm could get lower computation complexity.
KeywordsSum-Rate SWIPT Relay Transceiver Receiver
This work was supported by the Open Research Fund of State Key Laboratory of Space-Ground Integrated Information Technology under grant No. 2015SGII TKFJJTX02 and the National Science Foundations of China (No. 61671183).
- 6.Krikidis, I., Zheng, G., Ottersten, B.: Harvest-use cooperative networks with half/full-duplex relaying. In: Proceedings of IEEE Wireless Communications and Networking Conference (WCNC 2013), pp. 4256–4260, April 2013Google Scholar
- 7.Atapattu, S., Jiang, H., Evans, J., Tellambura, C.: Time-switching energy harvesting in relay networks. In: Proceedings of IEEE International Conference on Communications (ICC), pp. 5416–5421, June 2015Google Scholar