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7/27/2019 4G Technology(Final)
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A Way To Success :Implementaton of 4G For
Millitary Application.
Aanchal.M.Chhabria Disha.G.Gurnani
[email protected] [email protected]
Smt.S.H.Mansukhani Institute Of Technology
Abstract
Using science to turn mystery into mastery
Mobile communications systems revolutionized the way people communicate,
joining together communications and mobility. A long way in a remarkably shorttime has been achieved in the history of wireless. Evolution of wireless access
technologies is about to reach its fourth generation (4G). Looking past, wireless
access technologies have followed different evolutionary paths aimed at unified
target: performance and efficiency in high mobile environment. The first generation
(1G) has fulfilled the basic mobile voice, while the second generation (2G) has
introduced capacity and coverage. This is followed by the third generation (3G),
which has quest for data at higher speeds to open the gates for truly mobile
broadband experience, which will be further realized by the fourth generation (4G).
The Fourth generation (4G) will provide access to wide range of telecommunication
services, including advanced mobile services, supported by mobile and fixed
networks, which are increasingly packet based, along with a support for low to high
mobility applications and wide range of data rates, in accordance with service
demands in multiuser environment.
What is 4G?
The fourth generation wireless mobile systems, commonly known as 4G,
is expected to provide global roaming across different types of wireless and
mobile networks, for instance from satellite to mobile networks and to Wireless
Local Area Networks (WLANs). 4G Technology is basically the extension in the3G
technologywith more bandwidth and services offers in the 3G. The vision of 4G
wireless/mobile systems will be the provision of broadband access, seamless global
roaming, and Internet/data/voice everywhere, utilizing for each the most
"appropriate" always best connected technology . The expectation for the 4G
technology is basically the high quality audio/video streaming over end to end
Internet Protocol. These systems are about integrating terminals, networks, and
applications to satisfy increasing user demands.
History
mailto:[email protected]:[email protected]:[email protected]:[email protected]://www.freewimaxinfo.com/3g-technology.htmlhttp://www.freewimaxinfo.com/3g-technology.htmlhttp://www.freewimaxinfo.com/3g-technology.htmlhttp://www.freewimaxinfo.com/3g-technology.htmlhttp://www.freewimaxinfo.com/3g-technology.htmlhttp://www.freewimaxinfo.com/3g-technology.htmlmailto:[email protected]:[email protected]7/27/2019 4G Technology(Final)
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First Generation 1G (Analog ) : The first generation of mobile phones was
analog systems that emerged in the early 1980s and since then mobile
communications have undergone significant changes and experienced enormous
growth. First-generation mobile systems used analog transmission for speech
services. In 1979, the first cellular system in the world became operational by Nippon
Telephone and Telegraph (NTT) in Tokyo, Japan. The two most popular analog
systems were Nordic Mobile Telephones (NMT) and Total Access Communication
Systems (TACS). All of these systems offered handover and roaming capabilities but
the cellular networks were unable to interoperate between countries. This was one of
the inevitable drawback of first-generation mobile networks. It introduced the first
basic framework for mobile communications like the basic architecture, frequency
multiplexing, roaming concept etc. Access technology used was AMPS (Advances
Mobile Phone Service). The system was allocated a 40-MHz bandwidth within the
800 to 900 MHz frequency range by the Federal Communications Commission (FCC)
for AMPS. In 1988, an additional 10 MHz bandwidth, called Expanded Spectrum
(ES) was allocated to AMPS. Transmissions from the base stations to mobiles occur
over the forward channel using frequencies between 869-894 MHz. The reverse
channel is used for transmissions from mobiles to base station, using
frequencies between 824-849 MHz.
The Second-generation 2G (Digital ) : Second-generation (2G) mobile systems
were introduced in the end of 1980s. Low bit rate data services were supported as
well as the traditional speech service. Second-generation (2G) systems use digital
multiple access technology, such as TDMA (time division multiple access) and
CDMA (code division multiple access). compared with first-generation systems,
higher spectrum efficiency, better data services, and more advanced roaming were
offered by 2G systems. In Europe, the Global System for Mobile Communications
(GSM) was deployed to provide a single unified standard. This enabled seamless
services through out Europe by means of international roaming. Global System for
Mobile Communications, or GSM, uses TDMA technology to support multiple users.
Second generation networks allow limited data support in the range of 9.6 kbps
to 19.2 kbps. Traditional phone networks are used mainly for voice
transmission, and are essentially circuit-switched networks.
The GSM system also has an advantage of giving the operator a chance to create a
whole range of new services During development over more than 20 years, GSM
technology has been continuously improved to offer better services in the market.
New technologies have been developed based on the original GSM system, leading to
some more advanced systems known as 2.5 Generation (2.5G) systems. 2.5G
networks, such as General Packet Radio Service (GPRS), are an extension of
2G networks, in that they use circuit switching for voice and packet switching
for data transmission resulting in its popularity since packet switching utilizes
bandwidth much more efficiently. In this system, each users packets compete for
available bandwidth, and users are billed only for the amount of data transmitted.
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The Third-generation 3G (WCDMA in UMTS, CDMA2000 & TD-SCDMA) :
The standards for developing the networks were different for different parts of the
world. Hence, it was decided to have a network which provides services independent
of the technology platform and whose network design standards are same globally.
Thus, 3G was born. The International Telecommunication Union (ITU) defined the
demands for 3G mobile networks with the IMT-2000 standard. An organization
called 3rd Generation Partnership Project (3GPP) has continued that work by defining
a mobile system that fulfills the IMT-2000 standard. Services include wide-area
wireless voice telephony, video calls, and broadband wireless data, all in a mobile
environment. Additional features also include HSPA (High Speed Packet Access)
data transmission capabilities able to deliver speeds up to 14.4 Mbps on the downlink
and 5.8 Mbps on the uplink. The first commercial 3G network was launched by NTT
DoCoMo
in Japan branded FOMA, based on W-CDMA technology on
October 1, 2001.
4G
In order to make smooth transition from 3G to 4G the mobile communication
companies are promoting Super 3G/LTE. The companies are upgrading 3G
Technology by initializing the introduction of High Speed Downlink Packet Access
(HSDPA) service, which increases the downlink data rate of packet services, and by
finalizing specifications for High Speed Uplink Packet Access (HSUPA), which
enhances uplink speed. HSDPA and HSUPA cover area by 3-4 times relative to W-
CDMA and by providing the high transmission rate with low cost per bit
transmission. The main objective of the Super 3G is to construct simple, low cost
system by removing the complexity from wireless network and mobile handsets. The
3G provides packet and voice services separately where as Super 3G is based on
ALL-IP network covering both packet and voice services. As from diagram we can
infer that by the 2010 we would be able to achieve the 1 Gbps in motion at low speed
and 100 Mbps at high speed. On December 25, 2006, NTT DOCOMObecame the
first in the world to achieve a packet signal speed of 5 Gbpsin an outdoor test in a
low-speed environment (10 km/h). The test was undertaken to demonstrate the
expected maximum transmission speed in an actual cell environment, taking into
account interference from peripheral cells.
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We are steadily approaching towards 4G wireless technologies by upgrading
the current 3G technology by increasing the data rate speed and by reducing the cost
of transmission which is the main objective of 4G wireless technology.
There are some key components for the successful deployment of the 4G
wireless technology :
OFDMA (Orthogonal Frequency Division Multiple Access) modulation
Implementation of MIMO (multiple inputs, multiple outputs)
Smart antenna enhancements
SDR (Software-Defined Radio)
IPv6 and IP mobility
OFDMA (Orthogonal Frequency Division Multiple Access) modulation
Multipath phenomena in CDMA can tolerate long delay but it does not
capture the entire energy, only fraction of the energy of the multipath signal because
of limited no. of capability of taking the signal. In OFDM as from the below figure it
can be understand the long guard band interval is long enough to absorb all inter-
symbols-interference.
Orthogonal Frequency Division Multiplexing (OFDM) not only provides clear
advantages for physical layer performance, but also a framework for improving layer
2 performance by proposing an additional degree of freedom. Using ODFM, it is
possible to exploit the time domain, the space domain, the frequency domain and
even the code domain to optimize radio channel usage. It ensures very robust
transmission in multi-path environments with reduced receiver complexity.
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In OFDM, a data stream is split into Nc parallel lower data streams (a few
kHz) that are modulated on separate subcarriers. The split the signal is called
orthogonal subcarriers and these subcarriers are modulated by Inverse Discrete
Fourier Transformation (IDFT) and hence it does not affect the signals on multipath
effects. The long guard band is inserted between each OFDM symbol to absorb all
inter signal symbols interference. This significantly improves the physical layer
performance. The OFDM signal is also compatible with other enhancement
technologies like smart antennas and MIMO.
Multiple access technology (Orthogonal Frequency Division Multiple Access;
OFDMA) can also be used for modulation of OFDM. In this case, each OFDM signal
symbol can transmit information to/from several users using a different set of
subcarriers (subchannels). This not only provides additional flexibility for resource
allocation (increasing the capacity), but also enables cross-layer optimization of radio
link usage.
Implementation of MIMO (multiple inputs, multiple outputs).
In order to improve the communication performance between sender and
receiver, the multiple antennas are used at both transmitter and receiver end. MIMO
multiplex the signals from the multiple transmitting antennas as it is suitable for
OFDM because time symbols can be processed independently after OFDM waveform
is correctly designed for the channel. This aspects of OFDM reduces the complexity
while transmission and makes processing simple. The signal transmitted by m
antennas and signal received by n antennas and the processing of the received signal
may produce significant performance improvement such as range, quality of received
signal and spectrum efficiency. Hence MIMO is more efficient when many multiple
path signals are received. The gain in spectrum efficiency is directly related to the
minimum number of antennas in the link. The MIMO enables significant increase in
the data throughput and link range with additional bandwidth or transmit power. It
achieves this by higher spectral efficiency more bits per second per hertz of
bandwidth) and link reliability or diversity (reduced fading). Because of these
properties MIMO has become current theme of wireless research.
Smart antenna enhancements.
The main purpose of the radio communication depends on the advancements
of the antennas which refer to smart or intelligent antennas. In early 90s, in order to
meet growing data rate needs of the data communication, many transmission
techniques were proposed such as spatial multiplexing which increases the bandwidth
conservation and power efficiency. Spatial multiplexingprovides the multiple
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deployment of antennas at the transmitting and receiving end and then independent
streams of data can be transmitted as requested by the user can be transmitted
simultaneously from the all transmitting antennas. Thus increasing the throughput
into multiple folds with minimum number of the transmitting and receiving antennas.
There are two types of smart antennas which are switched beam smart
antennas and adaptive array smart antennas. Switched beam systems have several
available fixed beam patterns which help in making decisions as to which beam to
access at any given point of time based on the requirements of the system. While
adaptive arrays allow the antenna to steer the beam to any direction of interest while
simultaneously nulling interfering signals.
The reliability in transmitting high speed data in the fading channel can be
improved by using more antennas at the transmitter or at the receiver. This is called
transmit or receive diversity. Both transmit/receive diversity and transmit spatial
multiplexing are categorized into the space-time coding techniques, which does not
necessarily require the channel knowledge at the time of transmitting the signals. The
other category is closed-loop multiple antenna technologies which use the channel
knowledge at the transmitter.
SDR (Software-Defined Radio)
A basic SDR produces aradiothat is capable of receiving and transmitting a
different form of radio protocol (sometimes referred to as a waveform) as per the
needs just by running different software. A SDR will allow to increase network
capacity at specific time (e.g. during a sports event) and the operator can reconfigure
its network by adding several modems at a given Base Transceiver Station (BTS).
SDR will allow reconfigure network structure as per the needs. At the present SDR
implementation is done by the infrastructure which develops multi-band, multi-
standard base stations and terminals. SDR can be a powerful aid for manufacturer by
providing multi-standard, multi-band equipment with reduced development effortand
costs through simultaneous multi-channel processing. Software radios have
significant utility for the military andcell phoneservices, both of which must serve a
wide variety of changing radio protocols in real time. In the long term, software-
defined radio is expected by its proponents to become the dominant technology in
radio communications.
http://en.wikipedia.org/w/index.php?title=Switched_beam&action=edit&redlink=1http://en.wikipedia.org/w/index.php?title=Switched_beam&action=edit&redlink=1http://en.wikipedia.org/w/index.php?title=Adaptive_array&action=edit&redlink=1http://en.wikipedia.org/w/index.php?title=Adaptive_array&action=edit&redlink=1http://en.wikipedia.org/wiki/Radiohttp://en.wikipedia.org/wiki/Radiohttp://en.wikipedia.org/wiki/Radiohttp://en.wikipedia.org/wiki/Cell_phonehttp://en.wikipedia.org/wiki/Cell_phonehttp://en.wikipedia.org/wiki/Cell_phonehttp://en.wikipedia.org/wiki/Technologyhttp://en.wikipedia.org/wiki/Technologyhttp://en.wikipedia.org/wiki/Radio_communicationshttp://en.wikipedia.org/wiki/Radio_communicationshttp://en.wikipedia.org/wiki/Radio_communicationshttp://en.wikipedia.org/wiki/Technologyhttp://en.wikipedia.org/wiki/Cell_phonehttp://en.wikipedia.org/wiki/Radiohttp://en.wikipedia.org/w/index.php?title=Adaptive_array&action=edit&redlink=1http://en.wikipedia.org/w/index.php?title=Switched_beam&action=edit&redlink=17/27/2019 4G Technology(Final)
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IPv6 and IP mobility
4G wireless technology will be using mobile IPv6 which allows assigning
more number of addresses than IPv4. In IPv6 each device have own I P address. User
can keep their IP address even if user changes the access point. Presently translate IP
with each change because there are not enough IP addresses. The following diagram
shows that each IPv6 packet can have multiple source addresses and multiple
destination addresses.
Mobile IP techniques allow network roaming, a device can move from one network to
other network. IP Mobility is often termed macro-mobility since it will be global,
and independent of mechanisms (such as routing protocols, link-layers technologies
and security architectures) of different administrative IP-domains. These methods are
applicable to data and probably also voice. During handover in IP Mobility the
OFDM, MIMO allows macro-diversity processing with performance gains.
However, the implementation of macro-diversity implies that MIMO processing is
centralizedand transmissions aresynchronous. In high mobility a device is capable to
cope with more than 10 handovers per minute. In contrast, a host performing less than
10 handovers is considered to have low mobility.
Spectral efficiency in 4G
The 4G wireless technology bandwidth efficiency will be measured in terms of
spectral efficiency. Spectrum efficiency describes that the amount of information that
can be transmitted over a givenbandwidthin a specific communication system. It is a
measure of how efficiently a limited frequency spectrum is utilized by the physical
layerprotocol, and sometimes by the media access control (the channel access
protocol). Clearly the bit rate should be associated with an amount of spectrum. For
mobile use, a good target is a network performance of 5 bit/s/Hz, rising to 8 bit/s/Hz
in nomadic use.
For example, a transmission technique using one kilohertz of bandwidth to
transmit 1000 bits per second has a spectral efficiency of 1 (bit/s)/Hz. Also, a V.92
modem for the telephone network can transfer 56,000 bit/s downstream and 48,000
bit/s upstream over an analog telephone network. Due to filtering in the telephone
exchange, the frequency range is limited to between 300 hertz and 3,400 hertz,
corresponding to a bandwidth of 3400 300 = 3100 hertz. The spectral efficiency is
56,000/3,100 = 18.1 (bit/s)/Hz downstream, and 48,000/3,100 = 15.5 (bit/s)/Hz
upstream.
http://en.wikipedia.org/wiki/Bandwidth_%28signal_processing%29http://en.wikipedia.org/wiki/Bandwidth_%28signal_processing%29http://en.wikipedia.org/wiki/Bandwidth_%28signal_processing%29http://en.wikipedia.org/wiki/Physical_layerhttp://en.wikipedia.org/wiki/Physical_layerhttp://en.wikipedia.org/wiki/Physical_layerhttp://en.wikipedia.org/wiki/Media_access_controlhttp://en.wikipedia.org/wiki/Media_access_controlhttp://en.wikipedia.org/wiki/Channel_accesshttp://en.wikipedia.org/wiki/Channel_accesshttp://en.wikipedia.org/wiki/Kilohertzhttp://en.wikipedia.org/wiki/Kilohertzhttp://en.wikipedia.org/wiki/V.92http://en.wikipedia.org/wiki/V.92http://en.wikipedia.org/wiki/V.92http://en.wikipedia.org/wiki/Kilohertzhttp://en.wikipedia.org/wiki/Channel_accesshttp://en.wikipedia.org/wiki/Media_access_controlhttp://en.wikipedia.org/wiki/Physical_layerhttp://en.wikipedia.org/wiki/Physical_layerhttp://en.wikipedia.org/wiki/Bandwidth_%28signal_processing%297/27/2019 4G Technology(Final)
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One Of The Brands Of 4G Technology
WiMAX Wireless Network
In practical terms, WiMAX would operate similar to WiFi but at higher speeds, over
greater distances and for a greater number of users. WiMAX could potentially erasethe suburban and rural blackout areas that currently have no broadband Internet
access.
A WiMAX system consists of two parts:
A WiMAX tower, similar in concept to a cell-phone tower - A single WiMAX tower
can provide coverage to a very large area -- as big as 3,000 square miles (~8,000 square
km).
A WiMAX receiver - The receiver and antenna could be a small box orPCMCIA card,
or they could be built into a laptop the way WiFi access is today.A WiMAX tower station
can connect directly to the Internet using a high-bandwidth, wired connection (for
example, a T3 line). It can also connect to another WiMAX tower using a line-of-sight,
microwave link. This connection to a second tower (often referred to as a backhaul),
along with the ability of a single tower to cover up to 3,000 square miles, is what allows
WiMAX to provide coverage to remote rural areas.What this points out is that WiMAX
actually can provide two forms of wireless service:
There is the non-line-of-sight, WiFi sort of service, where a small antenna on your
computer connects to the tower. In this mode, WiMAX uses a lower frequency range -- 2
GHz to 11 GHz (similar to WiFi). Lower-wavelength transmissions are not as easily
disrupted by physical obstructions -- they are better able to diffract, or bend, around
obstacles.There is line-of-sight service, where a fixed dish antenna points straight at the
WiMAX tower from a rooftop or pole. The line-of-sight connection is stronger and more
stable, so it's able to send a lot of data with fewer errors. Line-of-sight transmissions
use higher frequencies, with ranges reaching a possible 66 GHz. At higher frequencies,
there is less interference and lots more bandwidth.
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Appliction Of 4G : Military Application
Introduction
Information is power, nowhere is this truer than on the battlefield, where the
ability to communicate clearly and rapidly pass on information spells the difference
between survival and death? 4G (4th Generation) is the technology that is going to
drive a soldier in the field in future. The key to empowering the military with tactical
broadband voice, video and data is 4G communications technology. This technology
adopts Wireless technology on the platform of fixed networks, Advanced antennae
technologies and More advanced wireless security technologies. Next thing is about
the gear for the future warrior. Our system provides a enhanced power of vision,
which provides Ground Guidance, Unit Detection, Soldier Status, Target Hand-Off
and provides the Soldier Rescue during the battle. The uniform along with the armor,
onboard computer which will monitor soldiers' overall physiological and
psychological picture of how they are performing in the battle zone and enhancedhuman performance which weighs 50 pounds from head to toe against 120 pounds of
the current day system present.
The new systems include a weapon, head-to-toe individual protection,
onboard computer network, soldier-worn power sources, and enhanced human
performance. "The Future Warrior will be a responsive and formidable member of an
invincible battle space team". The Future Warrior system will meet the more
immediate, short-term demands of our fighting warriors in the battle space, and will
remind you of an ominous creature out of a science fiction movie.
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Technique
The approach will support military operations across a spectrum of
environments from backpacks to ships. The key technology supporting these
initiatives is ad hoc peer-to-peer wireless networking (ad hoc p2p), also known as a
mobile mesh network. Ad hoc p2p operates by taking a collection of mobile terminals
(such as handheld devices and vehicular systems) that communicate directly with
each other without the aid of established infrastructure. Ad hoc networking provides a
self-organizing and self-healing network structure. Multi-hop routing terminals act as
routers and relays for each other, and extend the range and coverage of
communications links between individual soldiers, troop transports and command
centers. This is illustrated in Figure given below.
Battle field forces without any fixed infrastructure
The Basic Design
The military and DARPA have outlined specific capabilities for these devices.
At a minimum, they will need the following setup processes that are essential for a
good and effective communication between the soldier and his troops.
Deploy-ability with little or no fixed- infrastructure :
Military engagements are often spontaneous, and a communications solution
needs to be, as well. 4G Warriors bring their networks with them, and take them away
when they leave. Network setup automatically begins the minute troops exit a
transport, helicopter or ship.
Geo-location well beyond the limitations of GPS :
Soldiers cannot afford to expose themselves on a battlefield to acquire
GPS coordinates. GPS is also limited in that satellite signals cannot penetrate caves,
underground bunkers or inside shielded buildings. Ad hoc p2p wireless has built-in
geo-location using an extremely accurate form of triangulation. The 4G Warrior can
triangulate his or her position, or that of another soldier, based on mesh-enabled
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vehicles or other devices, even when hiding in caves or otherwise out of harm_s way.
Readings are faster than GPS (under a second) because soldiers don_t have to wait for
multiple satellites to acquire a fix.
Security :
The device security must address both communications security (COMSEC)
and a way to protect the network from unauthorized use if the device is captured.
Communications are more secure when mesh networks allow for route diversity.
Meshed architectures also allow devices to transmit at lower output power to
neighbours rather than _Shouting_ at a cell tower. This lowers the probability of
detection and increases battery life. Should a device be captured, the 4G Warrior can
blacklist that device to maintain the integrity of the network.
Anti-jamming robustness : .
The 4G Warrior is neither dependent on a single frequency nor constrained to
a military band. These self-forming, self-healing networks will have the ability to
instinctively and proactively reduce the probability of jamming. Communications
devices must operate while vehicles or soldiers are mobile, even at speeds in excessof 100 mph. 4G Warriors can receive real-time streaming video from aircraft, such as
the Predator. Drone flying over a battlefield. Multi-tap rake receivers minimize the
effects of Doppler radar to maximize the impact of theater air assets.
End-to-end IP :
Modern soldiers grew up with computers and will demand the same applications
and user interfaces available to civilians. The 4G Warrior, using instant messaging,
can send photos of enemy positions back to the camp for analysis, and use voice over
IP to communicate with nonmilitary phones in an occupied city.
4G On The Battlefield
All of the battlefield network devices including those embedded in tanks or
other vehicles will instantly form, heal, and update the network as users come and go.
That is, they will associate in an ad-hoc manner.Moreover, the devices will
automatically and continuously optimize network connections as users merge in and
out of the network at will. As intelligent elements, all of thedevices will constantly
reconfigure routing tables to determine the best network routes and, unlike cell-based
solutions, network coverage and service levels will improve when soldier densityincreases. The network resources are better utilized because networks are self-
balancing, as well. The soldiers_ subscriber devices can hop to distant network access
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points, away from points of congestion, shifting network capacity to meet demand.
Network deployment will be fast and easy because it is tower less. Communication
systems providing the backhaul and the network will disappear as fast as it was
formed once soldiers leave the area. The 4G battlefield will be entirely mobile, with
satellites or other. This technology could function as a personal are network (PAN),
local area network (LAN), or wide area network (WAN), simultaneously. This means
that the same network can connect a soldier to the squad or platoon, to the battalion,
and to a fully mobile division. It is the equivalent of a Bluetooth, 802.11, and 3G
convergences, but in a single network, with a single device.
Power Of Vision
This has been seen in science-fiction movies, a dropdown piece of eyewear
from the helmet allows the soldier to see a 17-inch computer screen displaying
anything relayed to the soldier. "This eyewear device is see-through, so it hangs out
in space. This allows soldiers to take in all supporting data while keeping both hands
on their weapons.
Conclusion :
The last few years have witnessed a phenomenal growth in the wireless
industry. The ever increasing demands of users have triggered researchers and
industries to come up with a comprehensive manifestation of the up-coming fourth
generation (4G) mobile communication system. As the history of mobile
communications shows, attempts have been made to reduce a number of
Technologies to a single global standard. Here we have used the next technology
of mobile technology- 4G for creating a fool proof system that can be used at any
place by a military force in the future. This system can be used to provide intelligent
communication cum detection system using which every soldier can be virtually
connected to a network that will be monitored by a mobile unit. Since the 4G
technology is yet to become a reality the system may look very simple but as the
technology will be implemented a more complex and cost effective system could bedesigned.