1 http://journals.cihanuniversity.edu.iq/index.php/cuesj CUESJ 2019, 3 (2): 1-4 ReseaRch aRticle Evaluation of the Effect of Follower Jammer on the Mobile Bluetooth Network Abdulqadir Ismail Abdullah 1 *, Adil Hussein M. Al-Dalawie 2 1 Department of Computer Science, College of Science, Knowledge University, Erbil, Iraq, 2 Department of Communication and Computer Engineering, College of Engineering Cihan University-Erbil, Erbil, Iraq ABSTRACT Bluetooth wireless communication technology has spread rapidly in the past 20 years. It has made life much easier with all the devices that use Bluetooth technology around us such as mobile phones, laptops, and watches. With all the good and useful applications of Bluetooth technology, it has been used in harmful and bad ways such as cheating in an examination. In this article, parameter design considerations have been discussed for a follower jammer to interrupt a Bluetooth network, especially when it is used in unauthorized way. Te efects of the follower jammer were studied and tested. Te efects were calculated for time and jamming-over-signal ratio for three diferent distances (1, 5, and 10 m). Te testing showed that the follower jammer designed was successful in disrupting the Bluetooth signal. Keyword: Bluetooth, follower jammer, mobile jammer INTRODUCTION B luetooth wireless technology since its development by Ericsson in Sweden in 1994 has become an essential tool of everyday life. Bluetooth wireless technology (BWT) has been used by many devices such as laptops, mobile phones, and car stereo systems. It has made everyday tasks very easy and efficient. [1] Bluetooth-enabled devices use ISM frequency band range between 2.4 GH and 2.48 GH. It uses a technique called frequency hopping (FH). This technique is useful for reducing interference. There are three classes of Bluetooth networks: Class 1 is 100-m range, Class 2 is 50-m range, and Class 3 is 10-m range. [1] Bluetooth wireless networks are subject to interference such as jamming which could be intentional, and this disrupts the service. Not all disruptions are bad thing because some people nowadays use bluetooth networks for some purposes which are not allowed. [2] There are deferent types of jamming techniques such as overall band noise jamming or spot jamming and swept jamming. Research into the evaluation of the effects of these three deferent methods on the mobile Bluetooth network provides good motivation to make a comparison between these techniques. The authors in a research article [3] focused on overall noise jamming techniques, spot noise with bandwidth 5 MHz and 20 Mhz, and sweep jammer. The conclusions of the research article [3] were that the block jammer signal (noise powered with different bandwidths 5 MHz and 20 MHz) does not affect the Bluetooth network, and it needs high power to overcome the processing gain and the path loss attenuator. The effect appears within 1-m distance by increasing the power density of the jamming signal; the bandwidth of the jamming signal was set to 5 MHz and uses very slow swept noise in order to affect the channels sequentially and keep the channel out of service according to Adaptive frequency hopping (AFH) and that will reduce the processing gain with time. Due to the power problems in the previous work, a new method had to be followed in order to reach better results that, in mid, a new technology was tested and studied in the research article such as the follower jammer technique, which is effected on FH. [3] FOLLOWER JAMMER TECHNIQUE FH spread spectrum is particularly useful to combat jamming primarily because it is relatively easy to operate Corresponding Author: Abdulqadir Ismail Abdullah, Department of Computer Science, College of Science, Knowledge University, Erbil, Iraq. E-mail: abdulqadir.abdullah@knowledge.edu.krd Received: Mar 27, 2019 Accepted: Apr 09, 2019 Published: Aug 20, 2019 DOI: 10.24086/cuesj.v3n2y2019.pp1-4 Copyright © 2019 Abdulqadir Ismail Abdullah, Adil Hussein M. Al-Dalawie. This is an open-access article distributed under the Creative Commons Attribution License. Cihan University-Erbil Scientific Journal (CUESJ)