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M-element parallel combination Chirp spread spectrum air sound wave communication method

An acoustic wave communication and air technology, applied in ultrasonic/acoustic/infrasonic transmission systems, electrical components, transmission systems, etc., can solve the problems of complex channel structure, inter-symbol interference at the receiving end, etc., to achieve large processing gain and improve frequency band utilization. , The effect of strong anti-Doppler effect

Inactive Publication Date: 2015-12-23
BEIJING SIXIANGWUXIAN CULTURE MEDIA LTD
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Problems solved by technology

When the transmission and reception distance of the acoustic wave signal in the air is several meters or more, the air acoustic channel will produce complex multipath effects due to the reflection of the sound wave and the scattering of the environment. Le effect is serious, such as figure 1 and figure 2 As shown, according to the actual measurement, when the sending and receiving distances are 4m and 10m in the indoor environment, the time delay of the multipath channel will reach hundreds of milliseconds, and sometimes the channel structure is extremely complex, which will cause serious intersymbol interference at the receiving end , so far, there are no public reports of effective communication methods for the above-mentioned complex channels

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  • M-element parallel combination Chirp spread spectrum air sound wave communication method
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  • M-element parallel combination Chirp spread spectrum air sound wave communication method

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] figure 1 and figure 2 They are the air acoustic channel structures when the actual measured indoor environment transmits and receives distances at 4m (short distance) and 10m (long distance). figure 1 and figure 2 ,As can be seen:

[0027] (1) The channel multipath structure is very complex, and non-minimum phase channels appear (that is, the channel multipath energy distribution does not decrease in time order), and it is difficult to counteract this multipath channel by using the usual equalization processing methods to deal with multipath channels , the performance is poor.

[0028] (2) The multipath time extension reaches 30-50ms. Since the bandwidth of the air acoustic channel is usually on the order of kHz, the ratio of the multipath extension to the symbol time of the communication data reaches the order of tens to one hundred. If the usual equal...

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Abstract

The invention discloses an M-element parallel combination Chirp spread spectrum air sound wave communication method, and the method comprises steps: signal transmitting and signal receiving. The method comprises the steps: generating a Chirp sequence set which is formed by the construction of Chirp signals; enabling to-be-transmitted digital information to be modulated by an M-element parallel combination Chirp spread spectrum modulation unit into a modulation signal; inserting a synchronous signal and a time protection interval before the modulation signal, so as to form a transmission signal; carrying out the time synchronization of the received signal, obtaining the starting time of a sound signal, and recovering original digital information of a digital signal part through an M-element parallel combination Chirp spread spectrum demodulation unit. The method provided by the invention can effectively improve the utilization rate of conventional Chirp spread-spectrum frequency bands, neutralizes a multi-path effect and a Doppler effect in an air sound channel, is low in calculation complexity, is large in processing gain, is strong in resistance to the Doppler effect, and is convenient to use in an intelligent terminal with audio receiving and transmitting equipment.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a communication method using airborne acoustic waves as a channel, and more specifically, to an airborne acoustic wave communication method using M-element parallel combination Chirp spread spectrum. Background technique [0002] The rapid development of smart terminal technology has made mobile phones an important tool for information transmission. The microphone and speaker of the smart terminal can be used for convenient and fast communication in the air. Therefore, it can be widely used in mobile payment and message push. [0003] There are three main technologies for using sound wave communication in the air. One is a new technology called Zoosh developed by Naratte, which can realize NFC (near field wireless communication) operation on any mobile device with microphone and speaker. Unlike the past that had to rely on NFC professional chips, Zoosh technology use...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B11/00H04B1/707H04B1/711H04B1/7073
Inventor 傅静静蔡振华谢晓辉
Owner BEIJING SIXIANGWUXIAN CULTURE MEDIA LTD
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