International Journal of Scientific & Engineering Research‚ Volume 4‚ Issue 8‚ August-2013 ISSN 2229-5518 1937 Automatic Vehicle Accident Detection And Messaging System Using GPS and GSM Modems Sri Krishna Chaitanya Varma‚ Poornesh‚ Tarun Varma‚ Harsha Abstract —The aim of our work is to find the vehicle accident location by means of sending a message using a system which is placed inside of vehicle system. The main purpose is to provide security to the vehicle in very reasonable cost
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channel‚ decode-and-forward‚ keyhole effects‚ moment generating function‚ orthogonal space-time block codes‚ symbol error rate. I. I NTRODUCTION It has been known that use of multiple antennas at transmitter and receiver increases speed of data transmission between communication terminals. However‚ MIMO channel capacity is degraded by correlation and keyhole effects. Because of the keyhole effect [1]‚ [2]‚ the rank of MIMO channel matrix is reduced to one‚ even in the absence of antenna correlation
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the frequency of the signal‚ the shorter the wavelength. vp Is the phase velocity f is the frequency vp Is the phase velocity f is the frequency λ=vpf Figure 1.1 What is a wave guide? Figure 1.2 A waveguide is a special form of transmission line consisting of a rectangular (figure 1.2) or cylindrical metal tube or pipe‚ through which electromagnetic waves are propagated in microwave and RF communications. It is commonly used in microwave communications‚ broadcasting‚ and radar installations
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* Set of techniques that allows the simultaneous transmission of multiple signals across a single link * allows several transmission sources to share a larger transmission capacity Link = physical path Channel = portion of a link that carries a transmission between a given pairs of lines 2 CATEGORY OF MULTIPLEXING WDM FDM TDM ADSL Frequency Division Multiplexing * FDM – numerous signals are combined for transmission on a single communications line or channel. Each
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present in the VoIP system. The comparison of how the delay varied with network load showed that there was a directly proportional relationship. A quantitative result was generated for the amount of audio lost during a 17 minute (1022 seconds) VoIP transmission‚ which was calculated to be 4.4 seconds. In conclusion hypotheses are drawn regarding the future application of VoIP and factors that might affect its commercial success. CHAPTER 1: Introduction Voice over IP (VoIP) is a technology that has
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LECTURE 7 * What 3 things must be present for communication to occur? * Transmission media‚ data transmission‚ cooperation * Define Bandwidth * Amount of data can be transferred from one point to another in a certain time * Define attenuation * Loss of power in a signal as it travels from sending device to receiving device * What is a protocol and why is it important in electronic communication? * Rules governing data communication including error detection
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is what to buy a revolver or a semi-automatic handgun. You see they both have the same outcome as they both will lay lead down in a hurry. So as I had done my research on what type of handgun to purchase‚ I looked at the history of what works for law enforcement as we carry handguns on a daily basis. I looked back on the Tennessee Highway Patrol and what we carried for years and found that we carried a .357 caliber revolver for years‚ until the semi-automatic was purchased. I have carried and been
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Encoding methods and Modulation schemes 25.P.1 Computers use digital signalling‚ digitals signals are represented by the base 2 numbering system “Binary”. Binary bits are shown as 1 or 0‚ where 1 means ON and 0 means OFF. In a network where digital devices exist‚ digital signalling will be used. Dependant upon the encoding method used‚ a high voltage on a communications medium can represent a logical 1 and a low voltage of can represent a logical 0. Different methods of encoding exist these
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project aims at providing a wireless information system that helps in transfer of information to the near by station immediately after the accident. The project consists of an accident identification system that can be placed in the car‚ information transmission system and information reception system. The information is also passed to the relatives mobile phone through GSM modem. The project also controls the theft of the vehicle. In case of theft‚ the exact location of the vehicle can
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Theory Introduction- In this report I will be writing about Signal Theory and all of its aspects‚ this involves talking about how data is transferred over a network‚ what a packet is and what information it contains‚ asynchronous and synchronous transmission‚ errors that data may encounter and what protocols are in place to avoid this from happening. Digital Signalling Methods- When data is sent over a network‚ it can either be through a wired or a wireless technology. The data is sent over a
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