A current-type human body channel modeling method for wearable devices combining field and circuit

Abstract

The invention relates to a field-circuit combined wearable device current-type human body channel modeling method. A current coupling signal transmission method is adopted, firstly a human body communication electric field model is established, enabling the parasitic capacitive impedance between communication parts and electrodes of the wearable device, actually measured external environment coupling capacitive impedance and the like to be equivalent to an external circuit model, and adding the external circuit model into the electric field model to obtain a field-circuit combined model. The field-circuit combined wearable device current-type human body channel modeling method improves the defect that an existing channel modeling method ignores the parasitic capacitive impedance among the electrodes, the external coupling capacitive impedance and the circuit of the wearable device and the like, perfects the integrity of modeling, performs human body channel estimation, can fully reflect the actual situations of actually measured environments and can realize higher fitness with real human body channel characteristics.

Description

technical field [0001] The invention relates to a current-type 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 inte...

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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 current-type 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 impedance of the external environment The external factors of the human body are equivalent to the external circuit model, combined with the constructed human body electric field model, and the field-circuit interface unit is used to construct the current-type human body channel model of the wearable device combined with field and circuit

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