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.

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Nonlinear phase noise in a fiber optical communication system with 16 Quadrature Amplitude Modulation (16-QAM) has been analyzed in this work. Three new constellation schemes are compared with the post compensation using mean shift rotation method. The new constellations focus on optimizing the ratio between the amplitudes in the 16-QAM and placing the points of 16-QAM in different patterns to minimize the effect of the nonlinear phase noise. In previous works, the best performance was achieved with circular constellation without any additional compensation techniques. The performance is improved by improved circular constellation with optimized radii, five shells circular constellation and improved five-shell circular constellation in this work. The improved five-shell circular constellation diagram improves the bit error rate performance by one order of magnitude from the existing circular constellation at the transmission distance of 3000 km. This result is due to the fact that moderate amplitude signals are more tolerance to nonlinear phase noise.Index Terms-16-QAM, Constellation diagram, nonlinear phase noise, optical fiber communication.

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