Mobile jammer
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Mobile jammers are devices that transmit signals to prevent cellular phones from receiving signals from base stations. They work by transmitting powerful radio frequencies that disrupt communication between phones and cell towers. There are different types of jamming techniques, including devices that transmit interfering signals (Type A), detect signals in quiet areas (Type B), function as beacons to disable phones (Type C), directly interact with phones (Type D), and use electromagnetic shielding (Type E). Mobile jammers have applications in maintaining silence in places like libraries, avoiding distractions in classrooms, and providing security in conferences. While jamming devices are illegal, companies are working on passive blocking technologies.
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Slide 5
Single Tone FM (cont.)
Slide 6
Narrow Band FM
Slide 7
Bandwidth of an FM Signal
Slide 8
Demod. by a Frequency Discriminator
Slide 9
FM Discriminator (cont.)
Slide 10
Discriminator Using Pre-Envelope
Slide 11
Discriminator Using Pre-Envelope (cont.)
Slide 12
Discriminator Using Complex Envelope
Slide 13 Phase-Locked Loop Demodulator
Slide 14
PLL Analysis
Slide 15
PLL Analysis (cont. 1)
Slide 16
PLL Analysis (cont. 2)
Slide 17
Linearized Model for PLL
Slide 18
Proof PLL is a Demod for FM
Slide 19
Comments on PLL Performance
Slide 20
FM PLL vs. Costas Loop Bandwidth
Slide 21
Laboratory Experiments for FM
Slide 21
Experiment 8.1 Spectrum of an FM
Signal
Slide 22
Experiment 8.1 FM Spectrum (cont. 1)
Slide 23
Experiment 8.1 FM Spectrum (cont. 1)
Slide 24
Experiment 8.1 FM Spectrum (cont. 3)
Slide 24
Experiment 8.2 Demodulation by a Discriminator
Slide 25
Experiment 8.2 Discriminator (cont. 1)
Slide 26
Experiment 8.2 Discriminator (cont. 2)
Slide 27
Experiment 8.3 Demodulation by a PLL
Slide 28
Experiment 8.3 PLL (cont.)
MATLAB and Simulink for Communications System Design (Design Conference 2013)
This session will show how Model-Based Design with MATLAB® and Simulink® can be used to model, simulate, and implement communications systems. Attendees will learn how multidomain modeling with continuous verification and automatic code generation can dramatically reduce system design time. A QPSK receiver model will be used as an example to highlight the design flow.
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This document outlines a presentation on simulating communication systems with MATLAB. It discusses simulating both analog and digital communication systems. For analog systems, it covers simulating amplitude modulation (AM) by generating a message signal, modulating it with a carrier, and demodulating to recover the message. It demonstrates adding noise to simulate a channel. For digital systems, it states it will cover binary phase-shift keying (BPSK) but does not provide details. The objective is for attendees to be able to write MATLAB scripts to simulate communication links and compare results to theory. It assumes a basic understanding of MATLAB, communications concepts, and performance metrics like bit error rate.
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Mobile jammer
- 1. SAI CHANDU.PAWAR 2ND MCA[4TH SEM] ROLL NO:13691F0035
- 2. What is mobile jammer? A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations. It is a device that transmit signal on the same frequency at which the GSM systems operates, the jamming is success when the mobile phone in the area where the jammer is located are disabled.
- 3. History Mobile jammer were originally developed for law enforcement and military to interrupt communications by criminals and terrorists. Some were also designed to foil the use of certain remotely detonated explosives.
- 4. How mobile jammer works A jammer device transmits- same radio frequencies of grate power as the cell phone, disrupting the communication between the phone and the cell- phone based station in the tower. it’s a called a denial- of-service attack.
- 6. This causes interference with communication of cell phones and towers to render the phones unusable. On most phones, the network would be out of range. So jammers work by either disrupting phone to tower freq.. Or tower to phone frequencies.
- 7. Jamming Techniques Type “A” Device: JAMMERS Type “B” Device: INTELLIGENT CELLULAR DISABLERS Type “C” Device: INTELLIGENT BEACON DISSABLERS Type “D” Device: DIRECT RECEIVE & TRANSMIT JAMMERS Type “E” Device: EMI SHIELD-PASSIVE JAMMING
- 8. Jamming Techniques 1.Type “A” Device: JAMMERS This type of device comes equipped with several independent oscillators transmitting ‘jamming signals’ capable of blocking frequencies used by paging devices as well as those used by cellular systems control channels for call establishment.
- 9. Jamming Techniques 2.Type “B” Device: INTELLIGENT CELLULAR DSSABLERS Unlike jammers, Type “B” devices do not transmit an interfering signal n the control channels. The device, when located in a designated ‘quite’ area, functions as a ‘detector’. It has a unique identification number for communicating with the cellular base station.
- 10. Jamming Techniques 3. Type “C” Device (INTELLIGENT BEACON DISABLERS) Unlike jammers, Type C devices do not transmit an interfering signal on the control channels. The device, when located in a designated ‘quiet’ area, functions as a ‘beacon’ and any compatible terminal is instructed to disable its ringer or disable its operation, while within the coverage area of beacon.
- 11. Jamming Techniques 4. Type “D” Device (Direct Receive & Transmit Jammers) This jammer behaves like a small, independent and portable base station, which can directly interact intelligently or unintelligently with the operation of the local mobile phone. The jammer is predominantly in receive mode and will intelligently choose to interact and block the cell phone directly if it is within close proximity of the jammer.
- 12. Jamming Techniques 5. Type “E” Device (EMI Shield –Passive Jamming) This technique is using EMI suppression techniques to make a room into what is called Faraday cage. Although labor intensive to construct, the Faraday cage essentially Blocks or greatly attenuates, virtually all electromagnetic radiation from entering or leaving the cage-or in this case a target room.
- 14. Types of Jammer Device Types of call phone jammer device. There are many types of cell phone jammer device which is used in our daily life. As we take a example of class room, where we does at want to use of cell phone than there we can use cell phone jammer device. By this we can produce the interface between the cell phone base station and cell phone. Resulting it disconnect the cell from base station. And we can not receive the any calls from base station.
- 15. Remote Control Mobile Jammer Adjustable Mobile Jammer School & Prison Mobile Jammer Explosion-Proof Mobile Jammer Police & Military Mobile Jammer Portable Mobile Jammer
- 17. Application To maintain the complete silence in library and lecture hall To avoid fraud in examination hall To avoid disturbance in class room For providing security in business conference, board of directors rooms, seminars, etc., For providing calm and peaceful atmosphere in hospitals Church/Mosques/Cathedral/Temple/Religious establishment
- 18. Future Scope of Jamming Technology While the law clearly prohibits using a device to actively disrupt a cell-phone signal, there are no rules against passive cell-phone blocking. Companies are working on devices that control a cell phone but do not jam the signal.
- 19. Conclusion Every technology has good aspect as well as bad aspect the important thing is, how we are using it. Cell phone jammers are very useful to the society from the anti-social elements. we can save our national leaders. We can restrict the communication network between the anti-social elements by using the Mobile Jammers. Cell phone jammers prevent the students from carrying cell phones to the colleges.
- 20. Thank you