Field-circuit coupled capacitive human body channel modeling method for wearable device

Abstract

The invention relates to a field-circuit coupled capacitive human body channel modeling method for a wearable device. In a capacitive coupling signal transmission mode, an electric field model of intra-body communication is established; and based on this, a communication part of the wearable device, parasitic capacitive impedance between electrodes and coupling capacitive impedance of external environment in actual measurement are equivalent into an external circuit model, and the external circuit model is added into the electric field model to obtain a field and circuit combination model. According to the method, the deficiencies of neglect of parasitic capacitive impedance between electrodes, coupling capacitive impedance of external environment and a circuit of a wearable device, and the like in an existing channel modeling method are improved, the completeness of modeling is perfected, and the human body channel estimation is performed with the field-circuit coupled capacitive human body channel modeling method for the wearable device, so that a true condition of actual measurement environment can be comprehensively reflected, and the degree of matching with true human body channel characteristics is higher.

Description

technical field [0001] The invention relates to a capacitive human body channel modeling method of a wearable device combining field and circuit. 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 intern...

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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 capacitive 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 capacitive capacitance of the external environment Impedance and other external factors of the human body are equivalent to an external circuit model, combined with the constructed human body electric field model, and the field-circuit interface unit is used to construct the capacitive human body channel model of the wearable device combined with field and circuit

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