Abstract
Abstract This paper investigates the performance of simultaneous wireless information and power transfer (SWIPT) in multi-hop amplify-and-forward (AF) and decode-and-forward (DF) wireless sensor networks (WSNs). For SWIPT, conventional energy harvesting (EH) protocols: time switching based relaying (TSR) and power splitting based relaying (PSR) are used. Relays harvest energy from the source using TSR/PSR protocol to assist information transmission to the destination. We have considered both uniform and optimal EH ratios at the relays in each protocol. Using the convex optimization method - Lagrange multiplier and Karush-Kuhn-Tucker (KKT) conditions, we have optimized the EH ratios of a 3-hop network. The mathematical expressions for destination throughput are derived for the aforementioned protocols. Results show that the SWIPT-DF network has higher throughput than the SWIPT-AF network, PSR outdoes TSR at high signal-to-noise ratio (SNR) and optimal EH ratios will result in better network throughput.
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