Signal Quality Assessment for Transdermal Optical Wireless Communications under Pointing Errors

In this paper, we assess the signal quality of the out-body to in-body optical communication link, which can be used as a fundamental enabler of novel biomedical appliances, such as medical implants, as well as biological and chemical components monitoring. In particular, we present a mathematical understanding of the transdermal system, which takes into account the optical channel characteristics, the integrated area limitations of the in-body unit, the transceivers’ pointing errors and the particularities of the optical units. Moreover, to accommodate the propagation characteristics, we present a novel simplified, but accurate, transdermal path-gain model. Finally, we extract low-complexity closed-form expressions for the instantaneous and average signal to noise ratio of the transdermal optical link (TOL). Numerical and simulation results are provided for several insightful scenarios and reveal that pointing errors can significantly affect the reliability and effectiveness of the TOL; hence, it should be taken into account in the analysis and design of such systems.

[1]  S. Nash,et al.  Linear and Nonlinear Optimization , 2008 .

[2]  P. Toint,et al.  Trust-region and other regularisations of linear least-squares problems , 2009 .

[3]  Ji-Woong Choi,et al.  Review of Near-Field Wireless Power and Communication for Biomedical Applications , 2017, IEEE Access.

[4]  Maurits Ortmanns,et al.  Optical transcutaneous link for low power, high data rate telemetry , 2012, 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[5]  Shlomi Arnon,et al.  Feasibility of retroreflective transdermal optical wireless communication. , 2012, Applied optics.

[6]  George K. Karagiannidis,et al.  BER Performance of FSO Links over Strong Atmospheric Turbulence Channels with Pointing Errors , 2008, IEEE Communications Letters.

[7]  Ashley J. Welch,et al.  Effects of compression on soft tissue optical properties , 1996 .

[8]  Valery V. Tuchin,et al.  OPTICAL PROPERTIES OF SKIN, SUBCUTANEOUS, AND MUSCLE TISSUES: A REVIEW , 2011 .

[9]  Maurits Ortmanns,et al.  System level model for transcutaneous optical telemetric link , 2013, 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013).

[10]  A. N. Bashkatov,et al.  Optical properties of human skin, subcutaneous and mucous tissues in the wavelength range from 400 to 2000 nm , 2005 .

[11]  George K. Karagiannidis,et al.  On the impact of misalignment fading in transdermal optical wireless communications , 2018, 2018 7th International Conference on Modern Circuits and Systems Technologies (MOCAST).

[12]  George K. Karagiannidis,et al.  Low-cost Cognitive Radios against Spectrum Scarcity , 2018, ArXiv.

[13]  Paul R. Stoddart,et al.  Infrared Neural Stimulation: Influence of Stimulation Site Spacing and Repetition Rates on Heating , 2013, IEEE Transactions on Biomedical Engineering.

[14]  Zabih Ghassemlooy,et al.  Emerging Optical Wireless Communications-Advances and Challenges , 2015, IEEE Journal on Selected Areas in Communications.

[15]  J. Abita,et al.  Transdermal Optical Communications , 2004 .

[16]  B. Smith,et al.  Design of a High Speed Transcutaneous Optical Telemetry Link , 2006, 2006 International Conference of the IEEE Engineering in Medicine and Biology Society.

[17]  Richard G Trohman,et al.  Interference in Implanted Cardiac Devices, Part I , 2002, Pacing and clinical electrophysiology : PACE.

[18]  Shlomi Arnon,et al.  Effects of atmospheric turbulence and building sway on optical wireless-communication systems. , 2003, Optics letters.

[19]  Maurits Ortmanns,et al.  In vivo verification of a 100 Mbps transcutaneous optical telemetric link , 2014, 2014 IEEE Biomedical Circuits and Systems Conference (BioCAS) Proceedings.

[20]  I. S. Gradshteyn,et al.  Table of Integrals, Series, and Products , 1976 .

[21]  Kaj Madsen,et al.  Introduction to Optimization and Data Fitting , 2008 .

[22]  Xiao-Feng Wang,et al.  Designing the Optical Interface of a Transcutaneous Optical Telemetry Link , 2008, IEEE Transactions on Biomedical Engineering.

[23]  Nitish V. Thakor,et al.  Wireless Power Transfer Strategies for Implantable Bioelectronics , 2017, IEEE Reviews in Biomedical Engineering.

[24]  S. Hranilovic,et al.  Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors , 2007, Journal of Lightwave Technology.