Research And Implementation Of Sound Wave Communication Protocol

With the spread of mobile terminal, the instant communication between mobile terminals is growing fast. Instant communication can be divided into online and offline communication. Because lack of the internet, offline communication between mobile terminals also plays an important part of the world. The near field communication (NFC) technology is growing up. But the equipment of NFC is much expansive and inconvenient to spread. In this paper, we propose a sound wave communication system, which aims at short distance and offline communication. Comparing with NFC, sound wave communication is much cheaper.In this paper, we analyze two non-open source projects, called Chirp and Alipay. Analyzing their implementation technology, we can figure out that their communication would rely on the internet. Moreover, their security depend on the server side logic to guarantee. During their communication, they would likely to be attacked by illegal clients.In this paper, we propose a sound wave communication protocol. To deal with the data compression problem, we propose an improved version of Run Length Encoding which is used to compress the sound wave during communication. What’s more, to deal with the integrity and security problem in offline scenario, we propose a method which would mix the MD5 numbers into the original data to provide basic security policy. While in online scenario, we could provide security channel for clients to communication using our system.