基於藍牙在IEEE802.11b頻道下之干擾情況模擬

Abstract

目前，通訊在生活上已經成為不可或缺的一部份。這個研究主要是為了發展出比較好的通訊系統。藍牙是一個無線短距離互聯運用在手機，電腦，和其它電子裝置。本 篇論文主要注重在如何增加藍牙訊號的品質。 2.4GHz ISM頻帶是一個未授權的無線電頻帶，且已經被選定為給各式不同的通訊電子裝置使用頻帶。IEEE802.11b和藍牙是共同使用在這個頻帶裡。 IEEE802.11b使用直接排序展頻技術來調變信號，這是不同於藍牙的調變技術。IEEE802.11b和藍牙使用的目地與比特率(速度)也都不相 同，也就是不同的頻率與不同的長度。在本篇論文，我們討論藍牙和IEEE802.11b調變技術，模擬藍牙傳送時的狀況，使用MATLAB模擬建構傳送時 的環境，模擬結果將顯示在BER。

Essentially, communication is unavoidable in today’s life. The research on the new technology to develop a better communication to facilitate the greater human needs is quite challenging and critical. Bluetooth is a standard for the short-range wireless interconnection of mobile phones, computers, and other electronic devices. This research will be in-depth focusing on the possibility of new technology to enhance the quality of Bluetooth signal. The 2.4 GHz ISM band is an unlicensed radio band which has been chosen to be a band for physical layer in many of communication devices. IEEE802.11b and Bluetooth are network systems for commercial usage that also share this band. IEEE802.11b used the direct sequence spread spectrum technique to modulate the signal which is different from Bluetooth modulation technique. IEEE802.11b and Bluetooth use in the different aimed targets and bit rate. Thus, frequency usage have varies length. In this paper, Bluetooth and IEEE802.11b modulation techniques are discussed but the simulation is based in Bluetooth transmission. And in this simulation, because of IEEE802.11b have characteristic familiar with the noise so we will assume the IEEE802.11b signal as a wideband noise that is been add into the channel that overlapped with the Bluetooth channels. This paper used MATLAB for building transmission environment, also apply Pseudorandom frequency hopping spread spectrum and the result would show as BER.