Abstract
Robust secure design for relay wireless sensor networks with simultaneous wireless information and power transfer
Highlights
Wireless sensor network (WSN) is envisioned as one of the most important research areas with numerous applications such as vehicular tracking, environmental monitoring,[1] and other fields.[2]
We investigate the BF and artificial noise (AN) design to minimize the relay transmit power based on the following settings: (1) one multi-antenna relay forward the information from the source to the information sensor node, denoted as information receiver (IR), in the presence of multiple energy sensor nodes, denoted as energy receivers (ERs), which may be potential Eve; (2) relay employs BF and AN to improve security and enhance energy transfer simultaneously; (3) relay has perfect channel state information (CSI) of the IR, but imperfect CSI of the ERs and the ERs colluding to eavesdrop the confidential information
Our main contributions can be summarized as follows: first, we propose a framework for secrecy Simultaneous wireless information and power transfer (SWIPT) in AF relay WSN with different service requirements at different wireless sensor nodes which gives rise to new BF and AN task
Summary
Wireless sensor network (WSN) is envisioned as one of the most important research areas with numerous applications such as vehicular tracking, environmental monitoring,[1] and other fields.[2]. International Journal of Distributed Sensor Networks which exploits the characteristics of wireless channels such as fading to fulfill secure communication, has been proved to be an effective way to improve security in WSN9 as well as SWIPT system.[10,11,12] Curiac[9] investigated the utility of directional antennas to improve security in WSN, while Xing et al.,[10] Liu et al.,[11] and Shi et al.[12] investigated the secrecy SWIPT scheme for single-input single-output (SISO) channel, multiple-input single-output (MISO) channel, and multiple-input multiple-output (MIMO) channel, respectively Among these literatures, beamforming (BF) and artificial noise (AN) are two key techniques to improve security and enhance EH.[13]. Our problem of interest is to design the BF matrix W and AN covariance Q such that minimize the relay transmit power while meeting the secrecy rate at the IR and the EH constraint at the ERs. Mathematically, our problem can be expressed as min TrÀWCWH. The SDR reformation of equation (11) can be defined as min TrðC WÞ + TrðQÞ
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