Novel energy-harvesting AF relaying schemes with channel estimation errors

Three novel structures using simultaneous wireless information and power transfer in energy-harvesting (EH) amplify-and-forward relaying are investigated in this paper. Different combinations of time-switching and power-splitting (PS) EH protocols are studied. Three dynamic schemes are proposed as channel estimation PS (CEPS), data transmission PS (DTPS), and combination PS (CPS). From source to relay in these schemes, the data packet includes three parts: channel estimation, data transmission, and EH. From relay to destination in these schemes, the data packet includes two parts: data transmission and channel estimation. Closed-form expressions for the cumulative distribution function of the end-to-end signal-to-noise ratio for the three structures are derived. Using these expressions, achievable rate and bit-error-rate are derived. Different parameters are examined. Numerical results show the optimal splitting ratio for the channel estimation, EH, and data transmission, when the packet size is fixed