A multi-coupling human body channel modeling method for wearable devices combining field and road

Abstract

The invention relates to a wearable device multi-coupling type human body channel modeling method combining a field and a path. The modeling method comprises steps of firstly establishing an electric field model of human body communication by adopting the transmission mode combining a capacitance coupling signal and a current coupling signal; on this basis, equating a communication part of a wearable device, the parasitic capacitive impedance among electrodes and the coupling capacitive impedance in an external environment in an actual measurement into an external circuit model; and adding the external circuit model in the electric field model so as to obtain the model combining the field and the path. According to the invention, the shortage is overcome that the parasitic capacitive impedance among electrodes, the coupling capacitive impedance in an external environment and circuits of a wearable device are often ignored in the current channel modeling method; integrity of modeling is improved; and with the method, human body channel evaluation is carried out, so actual situation of the actual measurement environment can be completely reflected and the result is highly consistent with actual human body channel characteristics.

Description

technical field [0001] The invention relates to a multi-coupling human body channel modeling method for wearable devices combining field and road. Background technique [0002] Human body communication is an electrical signal transmission technology with the human body as the transmission medium. It has broad application prospects and market potential in short-distance wireless communication fields such as medical detection, sports monitoring, consumer electronics, and soldier monitoring. The establishment of the human body channel model provides a basis for subsequent research on human body channel capacity, human body channel estimation, design of coding methods, optimization of modulation methods and other application development. The patent (application number 200910081416.X) proposes a finite element human body modeling method for human body communication. The various parts of the human body are geometrically abstracted according to the shape characteristics, the inter...

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Problems solved by technology

[0005] The existing human body channel models often ignore the parasitic capacitive impedance between the electrodes and the wearable device circuit, such as the influence of the input and output impedance of the internal signal source and receiver of the wearable device on signal transmission. In order to overcome these shortcomings, this paper Invented and designed a multi-coupling human body channel modeling method for wearable devices combining field and circuit. The communication part of the wearable device (including the sending module and receiving module), the parasitic capacitive impedance between electrodes, and the coupling capacitance of the external environment The external factors of the human body such as sexual impedance are equivalent to an external circuit model, combined with the constructed human body electric field model, and the corresponding field-circuit interface unit is used according to the different coupling methods used in information transmission, and the circuit model is combined with the electric field model to obtain a field-circuit combination Multi-coupled human body channel model for wearable devices

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