Characterizing terahertz channels for monitoring human lungs with wireless nanosensor networks

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• 作者：Eisa Zarepour^a ; ^c ; ^{ezarepour@cse.unsw.edu.au" class="auth_mail" title="E-mail the corresponding author} ; ^{zarepour@ictic.sharif.ir" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Mahbub Hassan^a ; ^{mahbub@cse.unsw.edu.au" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Chun Tung Chou^a ; ^{ctchou@cse.unsw.edu.au" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Majid Ebrahimi Warkiani^b ; ^{m.warkiani@unsw.edu.au" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：WNSNs ; In-vivo communication ; Lung monitoring system ; Periodic channel ; Channel estimation ; Nanoscale communication
• 刊名：Nano Communication Networks
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：9
• 期：Complete
• 页码：43-57
• 全文大小：2111 K

文摘

We characterize terahertz wireless channels for extracting data from nanoscale sensors deployed within human lungs. We discover that the inhalation and exhalation of oxygen and carbon dioxide causes periodic variation of the absorption coefficient of the terahertz channel. Channel absorption drops to its minimum near the end of inhalation, providing a window of opportunity to extract data with minimum transmission power. We propose an algorithm for nanosensors to estimate the periodic channel by observing signal-to-noise ratio of the beacons transmitted from the data sink. Using real respiration data from multiple subjects, we demonstrate that the proposed algorithm can estimate the minimum absorption interval of the periodic channel with 98.5% accuracy. Our analysis shows that by confining all data collections during the estimated low-absorption window of the periodic channel, nanosensors can reduce power consumption by six orders of magnitude. Finally, we demonstrate that for wireless communications within human lungs, 0.1–0.12 THz is the least absorbing spectrum within the terahertz band.