The Application And Performance Research Of AFH In Bluetooth

Bluetooth is a new technology standard for close distance wireless communications. It is used for describe and regulate how to connect all kinds of electronic production with close distance wireless. It works in industry science medicine (ISM) frequency band which is not need to be accredited, so there are many interferences. Although Bluetooth adopts frequency hopping to avoid interference, its bit error ratio will rise sharply when there are strong interference in the selected frequency band. This paper investigates adopting adaptive frequency hopping (AFH) to replace FH, in order to enhance Bluetooth's anti-jamming performance.This paper analyzes the interference Bluetooth faces on, the mechanism of Bluetooth for Anti-jamming, the work principle and key technology of AFH firstly, which are the bases for the next investigation. The emphasis of the paper is to research the enhance degree of Bluetooth's anti-jamming performance with AFH in different conditions. Inorder to resolve this question, the paper bring forwards a new method that adopting the simple two states interference modle and the interference-limited model, and simulates with MATLAB. For the simple two states interference modle, the different improvement of Bluetooth's anti-jamming performance after applying AFH is investigated for two instances such as parameters or active channels are different. Because the results from the simple two state interference model have much relations with the parameters selected, the interference-limited model is adopted then. For this, we consider two instances, one is the signal's power is constant and the other is signal's amplitude is Rayleigh distributed, and compare the results from two models.