Abstract
In this paper, we present a few novel simultaneous wireless information and power transfer (SWIPT) schemes that can be effectively used in various 5G wireless network implementations. First, we study the possibility of integrating distributed energy beamforming with the data rate fairness beamforming in a cooperative communication system with multiple cooperative relays and multiple destination users communicating simultaneously. We show that the system exploits significant performance gain using such a joint energy and data rate fairness beamforming scheme. Further, we propose an enhanced version of the SWIPT scheme, the energy-efficient modulation-based non-orthogonal multiple access (M-NOMA) SWIPT scheme, and observe its system efficiency in terms of more harvested energy. Finally, we consider an energy-harvesting SWIPT scheme where the channel response is estimated using the energy-harvesting signal as pilots superimposed on the information signal. For such a scheme, we compute the optimum transmit power ratio between the pilot and information signals under varying SNR conditions and improve the accuracy of the decoding process at the reception.
Highlights
In the rapidly-evolving 5G wireless communication systems, the network size is expected to increase substantially, namely due to machine-to-machine (M2M) communications and sensor networks [1,2]
We first considered the integration of distributed energy beamforming with a cooperative communication system consisting of multiple cooperative relays and users, where multiple cooperative relays performed the data rate fairness beamforming to maintain fair service to all users
We have studied several energy harvesting schemes for the cooperative relay and user system, and we demonstrated that the joint energy harvesting and data rate fairness beamforming with distributed power beacons were the best-performing schemes
Summary
In the rapidly-evolving 5G wireless communication systems, the network size is expected to increase substantially, namely due to machine-to-machine (M2M) communications and sensor networks [1,2]. Enabling SWIPT with NOMA in the wireless network system provides an efficient use of the energy and radio spectrum. Many authors put these schemes together and obtained amazing and substantial results. In [16], the authors studied SWIPT-enabled MIMO NOMA cognitive networks for maximizing the harvested energy by the secondary user (relay) and minimizing the transmission power on cognitive BS. The authors of [20] proposed the MIMO and SISO SWIPT NOMA scheme with joint optimization of power splitting (PS) and beamforming. The latter maximizes the data rate of strong users and the.
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