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wireless optical communication full report
Post: #1


Wireless OPTICAL COMMUNICATION is suitable for wireless home links because:
¢ Wide bandwidth is available for an optical carrier and is suitable for high speed transmission
¢ The optical devices are small and low in cost.Thus they can simplify the structure of transmitters and receivers
¢ The optical wireless network needs no license

There are certain scenarios in which RF signals are not suitable because:
¢ They produce and are affected by EM interferences
¢ As they require legal procedure to be installed they are confined to some frequencies and the bandwidth become a scarce recourse
¢ They can be intercepted by other users and communication can result non secure


¢ They neither produce,nor are affected by EM interferences,so they can be used in EM restricted scenarios and in others in which interferences are present now
¢ They do not require legal procedures to be installed so you have all the bandwidth you can manage
¢ There are well established commercial devices and standards offering good performance
¢ They can be intercepted but it is not easy to accessdata without detection and even without codification


The UOWC terminal includes an optical transmitter and a receiver positioned,several hundred meters




The standardisation of communication processes that has led to the explosion of tele communication products in the consumer area has yet to take hold in the world of clinical medicine
IT standards within the commercial application domain are inadequate to fully address the needs of the clinical IT domain especially in the patients bed side
RF system has got security and operation problems


¢ ON BOARD systems for cable replacement on satellites
¢ Weight considerations
¢ Robustness on rocket launching


¢ UWB is to assume much of the nowadays applications of wireless optical systems
¢ MANY OF THE SCENARIOS are held by very conservative organisations such as hospitala,nuclear administrations and changes are delayed to the state of art in communications
¢ Optical system have an opportunity on cheap in house and ad-hoc sensor internet working
Post: #2
plz send the report of this topic....
Post: #3
wireless communication systems

Traditional wireless communication systems use a single antenna for
transmission and a single antenna for reception. Such systems are
known as single input single output (SISO) systems (Fig.1). In
recent years, significant progress has been made in developing
systems that use multiple antennas at the transmitter and the receiver
to achieve better performance[3]. Such systems are known as
multiple input multiple output (MIMO) systems (Fig.2).
There are two types of benefits of using multiple antennas: link
budget / spatial diversity improvement and throughput improvement
from spatial multiplexing. Both are intrinsic to wireless channels,
where rich spatial variations or spatial dimensionality exist [3].
Spatial diversity refers to the fact that the probability of having
all antennas at bad locations is significantly lower as the number of
antennas increases. Link budget improvement refers to the fact that
the signals from the various antennas can be combined to form a
signal stronger than any of the individual signals. For receive
spatial diversity, signals received on multiple antennas are weighted
and combined, e.g. maximal ratio combining (MRC)[3]. There are
two types of transmit spatial diversity, open-loop and closed-loop.
Open-loop transmit diversity involves transmitting signals from
multiple antennas in some deterministic pattern, that does not
depend on the channel. Open-loop techniques include cyclic delay
diversity (CDD) and space-time block codes (STBC)[3]. Closedloop
transmit diversity techniques, in contrast, require channel
information to guide transmissions. An example is transmit
beamforming (TxBF), where proper magnitude and phase weights
computed from the channel estimation are re-applied across
antennas to aim the signal in a given desired direction[3]. MIMO
systems with spatial diversity achieve better performance, i.e. longer
range for a given data rate, or higher data rate than SISO systems at
a given same location.
Post: #4
hi ...
i am arun. i want full report
Post: #5
to get information about the topic securing wireless communication full report ,ppt and related topic please refer link bellow

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