Approximative Error Detection at Wireless Transmission

OData support
Dr. Fehér Gábor
Department of Telecommunications and Media Informatics

In recent days, with the spread of digital communication, wireless transmission is also gaining ground. Radio-frequency channel is, however, exposed to noise and errors on a much larger scale than its wired counterparts, and the current communication protocols force a strictly error-less transmission, regardless of the application's requirements. Multimedia content, for example, has the ability to recover the original message from malformed messages, thus preserving bandwidth and valuable resources.

Approximate error detection can be a solution for this problem. Not only does it signal the presence of bit errors, but also shows the approximate number of them. This way, the application can decide wheter or not it is able to accept the incorrect packages. It means fewer lost packets and better user experiance, while relieving the network from the burden of retransmission.

At first, the literature of traditional error detecting and correcting code is reviewed, and compared to approximate solutions. One such algorithm was successfully implemented on an OpenWrt wireless access point, and by developing a test environment, studies have been made regarding the optimal settings of the code.


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