Air sound wave communication channel equalization method and device based on channel characteristics

Abstract

The invention discloses an air sound wave communication channel equalization method and device based on channel characteristics. A frame structure, designed through the method, meets the requirements of time domain and frequency domain, and provides a basis for the combined processing of a receiving end. The method provided by the invention gives consideration to the advantages of time domain equalization and frequency domain equalization, avoids the high calculation complexity of a time domain equalization method under the condition that a channel structure is complex, improves the possibility of algorithm convergence, and also can improve the performance of frequency domain equalization in a Doppler frequency shift air sound wave channel, so as to achieve the reliable air sound wave communication in different channel environments.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a method and device for communicating using airborne acoustic waves, in particular to a method and device for equalizing airborne acoustic wave communication channels based on channel characteristics. Background technique [0002] With the rapid popularization and promotion of smart terminal products, mobile phones, as a mobile terminal, have become an important carrier of information transmission. Users can use mobile phones to make payments, receive voice broadcast information, etc. Since the air acoustic wave communication technology can be used to carry out software development on mobile terminals such as mobile phones to realize the above functions, it has convenience and good user experience, and the application prospect is very broad. [0003] However, using the air acoustic channel will face some problems. The reflection and refraction of sound waves will prod...

AI Technical Summary

Problems solved by technology

The reflection and refraction of sound waves will produce complex multipath effects. In addition, the Doppler effect caused by the relative movement of the sending and receiving process is serious

In view of the above problems, phase frequency shift keying modulation combined with channel equalization technology can offset the intersymbol interference caused by multipath effect. Equalization can be divided into two methods: time domain equalization and frequency domain equalization. Time domain equalization can be used The symbol rate adaptively adjusts the equalizer coefficients and tracks the carrier phase. However, when the channel structure is too complex, such as the channel time delay is long, the equalizer order will be too high, and the calculation complexity will increase. In some cases, it may not even be possible. Convergence; and frequency domain equalization can work in the case of complex channel structure, but it is more sensitive to Doppler frequency offset

It can be seen that the two methods of time domain equalization and frequency domain equalization have their own shortcomings when applied in complex air acoustic channels.

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