13-08-2012, 12:14 PM
MOBILE PHONE INTELLIGENT JAMMING SYSTEM
1MOBILE PHONE.pdf (Size: 1.49 MB / Downloads: 140)
Abstract
The dependence on Mobile Networks is worldwide. The success and growing in mobile
networks becomes troublesome and annoying by the ringing of mobile, especially in places
where silence is required such as Mosques, University lecture rooms, libraries, concert halls,
meeting rooms etc. This project will solve this problem by using an intelligent jamming
device capable of preventing cell phones which operates within a restricted area. This
project gives an explanation to the concept of mobile Jamming and explores jamming in the
two popular mobile networks: Global system for mobile communication (GSM) and digital
cellular network (DCS). The intelligent jamming system is designed to block only the
controller channel, also to operate only if there is active mobile in the restricted area. The
system of mobile jamming is analyzed and simulated using the Advance Design System
(ADS) for Agilent software package.
INTRODUCTION
The last few years have witnessed a dramatic boom in the wireless communications industry
which causes an increase in number of mobile users. This evolution of communication gives
numerous advantages and convenience for mobile user, however, the ringing of mobile phones
becomes troublesome and annoying, especially in places where silence is required such as
Mosques, University lecture rooms, libraries, concert halls, meeting rooms etc. This project will
solve this problem by using an intelligent jamming device capable of prevent cell phones from
operate within a restricted area in Jordan.
Communication jamming devices were first developed and used by military forces to prevent
successful transport of information between enemy forces. Nowadays, the mobile jammer
devices are becoming civilian products rather than military devices. There are two major types
of jammers non‐intelligent and intelligent jammers. The non‐Intelligent Jammer is used in a
restricted area and it is designed to block all mobile phones operate in a certain frequency
bands such as downlink frequency band of global system for mobile communication. This type
of jammers is not fit for civilian use and especially for military applications; because it blocks all
mobile phones present in the restricted area. In addition, the system will transmit jamming
signals, whether there is mobile user in that restricted area or not. Moreover, the nonintelligent
system jams the whole downlink frequency band even though the intruder mobile
phone uses only a small portion of the band.
Importance
The intelligent mobile phone jammer helps us to silence all mobile phones in quite areas and
thus enforce the respect of people’s privacy.
Some countries prevent the use of jamming systems in civilian places; because it is radiates
the jamming signals at all time that may be effect on human health. The proposed intelligent
system solves this problem by designing a mobile detector which can decide if there is mobile
around or not; to make the jamming system work only at calling.
The system is designed to block only the controller channel not the whole of spectrum as the
non‐intelligent jammers.
Report Outline
This Report is divided into seven chapters; Chapter 2 will explain the main structure of
GSM/DCS system network related to air interface base transmission station (BTS) and Base
station center (BSC).The disabling of the mobile communication systems (GSM, DCS) done by
using Jamming techniques which explained in chapter 3. Electronic circuits and power supply
will be designed and simulated using advance design system (ADS) software package, these
details shown in chapter 4. The main feature of this project is to select only the controller
channel and block it only, the technique of knowing this channel will explain in chapter 5. The
intelligent jamming system has intelligent controller system consists of PIC Microcontroller and
interfacing ports these details can be seen in chapter 6. Finally the conclusion and future
recommendation are given in chapter 7.
JAMMING TECHNIQUES
After the background information of GSM/DCS systems, it does make sense to have
information about the methods which followed to jam the communication systems. In
general, the Jamming is successful when the jamming signal denies the communication
Process. This chapter will describe these methods (jamming techniques) in details that based
on two basic ideas: noise mixing and phase changing to obstruct and block the original signal.
Broadband Noise (BBN) Jamming:
Broadband noise (BBN) jamming places noise energy across the entire width of the
frequency spectrum used by the target system radios. It is also called full band or barrage
jamming. This type of jamming is useful against all forms of target system communications. It
is generally useful for coverage an area for screening purposes as well [5].
The limitation of this jamming that is result in low jo (jamming signal power) and this low
power is spread very wide. The BBN can effect on synchronization as Fast Frequency
Hopping (FHSS) which typically need resynchronize on every transmission attempt [5].