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This paper investigates and optimizes the performance of simultaneous wireless information and power transfer (SWIPT) in wireless sensor networks over Nakagami-m fading channels. In the considered system, there is one mobile reader (R), which is equipped with one transmit antenna and one receive antenna, and a group of passive sensors. The information delivery includes two stages: (1) R broadcasts a command with radio-frequency energy to the sensors, which adopt time splitting (TS)/power splitting (PS) schemes to harvest energy and (2) sensors deliver their information to R over orthogonal channels by using the harvested energy. In this paper, we propose a unified framework to study and optimize the impact of SWIPT on the system performance with both TS and PS schemes. First, we characterize the probability density function and cumulative distribution function of the signal-to-interference-plus …