AFH Techniques Survey Based on Probabilistic Channel Usage

Sejal D'mello, Zahir Aalam


Devices communicating by means of Bluetooth wireless technology run the risk of causing and encountering interference in environments where other wireless technologies such as WiFi, Zigbee etc are in use. These technologies operate in the same unlicensed 2.4 GHz ISM radio band. To improve performance in these environments, a technique known as Adaptive Frequency Hopping has been introduced by the Bluetooth Special Interest Group (SIG) to diminish the impact of such interference. Also referred to as AFH, the technique explained in this paper can avoid the bad frequencies and guarantee the desired level of channel quality. The paper aims at discussing some newly proposed adaptive frequency hopping schemes to reduce the interference. Also some newly proposed adaptive frequency hopping schemes that are based on probabilistic channel usage have been summarized, which provide an important reference for the practical application.

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