Chirp spread spectrum human body communication method based on activated carrier label modulation

A technology for human body communication and activating carrier waves, applied in modulation carrier systems, baseband systems, multi-frequency code systems, etc., it can solve the problems of OFDM subcarrier orthogonality being easily destroyed, inter-carrier interference, and communication performance degradation, etc. Communication transmission rate, overcoming high peak power, convenient despreading effect

Active Publication Date: 2021-12-21
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The traditional OFDM multi-carrier communication system is to modulate the serial data onto multiple orthogonal carriers in parallel for transmission to increase the communication rate. Since the orthogonality of OFDM sub-carriers in the time-frequency dual-selection channel is easily destroyed, the carrier Interference between the two leads to a rapid decline in communication performance, while Chirp spread spectrum communication has the characteristics of adapting to time-frequency dual-selection channels. When FRFT is used as a powerful tool for processing Chirp signals, the multi-carrier communication method using Chirp signals as subcarriers has recently received a lot of attention. big concern

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  • Chirp spread spectrum human body communication method based on activated carrier label modulation
  • Chirp spread spectrum human body communication method based on activated carrier label modulation
  • Chirp spread spectrum human body communication method based on activated carrier label modulation

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Embodiment

[0048] This embodiment discloses a Chirp spread spectrum human body communication method based on activated carrier label modulation, and the realization of the block diagram is as follows: figure 2 As shown, it specifically includes the following steps:

[0049] S1. Serial-to-parallel conversion: perform serial-to-parallel conversion on the source sequence to be transmitted. According to the modulation scheme, each group of 3-bit information is grouped, and the serial source data stream is converted into parallel data for transmission.

[0050] S2. Carrier label mapping: Carrier label mapping is performed on the first 2 data bits in the 3-bit parallel data in step S1, and the 2-bit data bits are mapped according to the method in Table 1, wherein b 2 and b 1 Indicates the first two bits after serial-to-parallel conversion of the source sequence, c 1 、c 2 、c 3 、c 4 Indicates the 4-bit carrier label activation status bit. Through such a mapping rule, the 2-bit information...

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Abstract

The invention discloses a Chirp spread spectrum human body communication method based on activated carrier label modulation. According to the invention, the transmitting end directly modulates the information source information and then carries out Chirp spread spectrum, small-scale fading in human body communication can be effectively resisted, and activation carrier mark number modulation is carried out by utilizing multiple paths of Chirp subcarriers overlapped in a frequency domain, so that more information bits are carried to ensure a high communication rate; meanwhile, the problems of high peak power, carrier interference and the like in multi-carrier communication can be solved; in addition, the receiving end carries out channel estimation in the fractional domain, completes virtual time reversal and carries out carrier mark number identification and dispreading, the cost is low, implementation is easy, and higher communication quality can be guaranteed.

Description

technical field [0001] The invention relates to the technical fields of spread spectrum communication, multi-carrier communication, body area network and the like, in particular to a Chirp spread spectrum human body communication method based on active carrier label modulation. Background technique [0002] With the gradual miniaturization, low power consumption and portability of wearable and implantable devices, these wireless terminal devices can be used in revolutionary medical applications such as mobile medical care, long-term health monitoring and health assistance, telemedicine systems, and can also be used in In non-medical applications such as auxiliary sports training, safety certification, and real-time streaming media, wireless access to the body area network can be used in the future to realize the interconnection of everything. Wireless body area network communication involves multiple technical fields such as wireless personal area network, wireless sensor ne...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04B1/707H04B1/7073H04B1/711H04L25/03H04L27/26
CPCH04B1/707H04B1/7073H04B1/711H04L27/2614H04L27/2621H04L25/03821
Inventor刘娇蛟严远美马碧云余华
OwnerSOUTH CHINA UNIV OF TECH