Ultrasonic intra-human communication method and device based on group index modulation
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A technology of index modulation and communication method, applied in ultrasonic/sonic/infrasonic transmission systems, sustainable communication technology, advanced technology, etc.
Active Publication Date: 2021-03-30
SOUTH CHINA UNIV OF TECH
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However, applying index modulation directly to the slot index is not suitable for human body communication
Due to the serious multipath effect in the human body, when multiple pulses are sent in one transmission frame, adjacent pulses will cause serious interference, resulting in serious bit errors
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Embodiment 1
[0078] This embodiment discloses an ultrasonic communication method in the human body based on group index modulation, such as figure 1 As shown, the steps are as follows:
[0079] S1. On the sending node, perform serial / parallel conversion on the serial information, and divide it into multiple information blocks, each information block includes Y modulation bits and M index bits. In this embodiment, every 5 bits is an information block, wherein the first 3 bits are modulation bits, and the last 2 bits are index bits.
[0080] In this embodiment, the sending node may be, for example, a medical device implanted in a human body, or a wearable sensing device. The sending node is located in a wireless communication network using the human body as a transmission medium, and the number of sending nodes can be set to one or more. The wireless communication network also has a receiving node. The receiving node can be, for example, a medical device implanted in the human body, or a w...
Embodiment 2
[0137] This embodiment discloses an ultrasonic communication device in the human body based on group index modulation, such as image 3 As shown, it includes: a transmitter module and a receiver module. The transmitter module is wirelessly connected to the receiver module through the human body. The transmitter module and the receiver module can be, for example, medical devices implanted in the human body, or wearable sensing devices. .
[0138] Wherein, the sending end module includes a first converter, a packet module, an index modulator, a digital modulator, a second converter and a first communication module:
[0139] The first converter is used to perform serial / parallel conversion on the serial information, divide it into a plurality of information blocks, and transmit the information blocks in parallel to the index modulator and the digital modulator, wherein each information block includes Y modulation bits and M index bits.
[0140] The grouping module is used to di...
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Abstract
The invention discloses a method and device for ultrasonic intra-body communication based on packet index modulation. The method includes dividing serial information into blocks on a sending node, each information block including modulation bits and index bits; dividing each sending frame into into multiple groups; carry out index modulation on the group of each sending frame, and determine the corresponding activation group serial number according to the index bit; carry out digital modulation on the modulation bits of each information block, and map the modulation bits after digital modulation Go to the activation group corresponding to the activation group number; sequentially perform parallel / serial conversion, pulse shaping and ultrasonic conversion on multiple information blocks processed in parallel to obtain the transmission signal, and transmit the transmission signal in the human body through the sending frame; on the receiving node The transmission signal transmitted by the human body is received, and the transmission signal is demodulated to obtain index bits and modulation bits. The invention can effectively overcome the multipath effect of the human body and realize high-speed and energy-saving ultrasonic human body communication.
Description
technical field [0001] The invention relates to the technical fields of physical layer modulation, human body communication and ultrasonic wireless communication, in particular to an ultrasonic intra-human communication method and device based on packet index modulation. Background technique [0002] In recent years, with the advancement of medical technology, the miniaturization of medical equipment, and the development of individualized medical needs, human body communication research has made remarkable progress. Human body communication research plays an important role in mobile medical care and health monitoring, and implantable human body communication is an important part of human body communication. However, the existing radio frequency communication technology has a high absorption rate in human body communication, and long-term radiation hazards are great; the sending node and receiving node of capacitively coupled human body communication need to form a ground loo...
Claims
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