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8/4/2019 Application of digital signal processing in Radio transmitter, CDMA, GSM, Optical fiber, DTH communication
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Application of digital signal processing
in Radio transmitter, CDMA, GSM,
Optical fiber, DTH communication
Name: Ramjee prasad
Roll no: RH6802B54
Reg no: 10804900
B.Tech (ECE), LEET, 5th SEM
ECE-300
Digital Signal Processing:
Introduction:
DSP, or Digital Signal Processing, as the
term suggests, is the processing of signals
by digital means. A signal in this context
can mean a number of different things.
The term "digital" comes from "digit",
meaning a number, so "digital" literally
means numerical. A digital signal consists
of a stream of numbers, usually (but not
necessarily) in binary form. The
processing of a digital signal is done by
performing numerical calculations. Signalscommonly need to be processed in a
variety of ways: For example, the output
signal from a transducer may well be
affected with unwanted electrical "noise.
Processing the signal using a filter circuit
can remove or at least reduce the unwanted
part of the signal. Increasingly nowadays,
the filtering of signals to improve signal
quality or to extract important information
is done by DSP techniques rather than by
analog electronics.
Applications of DSP
Digital Signal Processing technology is
nowadays commonplace in such devices as
mobile phones, multimedia computers,
video recorders, CD players, hard disc
drive controllers, DTH system, satellite
communication etc. An important
application of DSP is in signal
compression and decompression. Signalcompression is used in digital cellular
phones to allow a greater number of calls
to be handled simultaneously within each
local "cell". DSP signal compression
technology allows people not only to talk
to one another but also to see one another
on their computer screens, using smallvideo cameras mounted on the computer
monitors, with only a conventional
telephone line linking them together.
Digital signal processing techniques:
In the digital signal processing various
type of algorithm like discrete Fourier
transform, fast Fourier transform and
filtering methods like FIR and IIR, and
adaptive filtering are involved. In this foranalysis of LTI system we used various
type of transformation technique for the
analysis of frequency domain behaviour of
the system and signal. In many digital
signal processing system we used Fourier
transform and Z- transform.
Radio transmitter communication:
A radio transmitter is an electronicdevice
which, usually with the aid of an antenna,
propagates an electromagnetic signal such
as radio, television, or other
telecommunications. In modern
technology of radio transmitter digital
signal processing is widely used over
analog signal processing. Digital signal
processing (DSP) techniques are rapidly
being applied to many signal conditioning
and signal processing tasks traditionally
performed by analog components and
subsystems in RF communicationreceivers and transmitters.
The use analog system in signal processing
functions with DSP-based processing
includes reduced cost, enhanced
performance, improved reliability, ease of
manufacturing and maintenance, and
operating flexibility and configurability.
Technologies that facilitate cost-effective
DSP-based implementation include a very
large market base supporting high- performance programmable signal
http://en.wikipedia.org/wiki/Electronicshttp://en.wikipedia.org/wiki/Machinehttp://en.wikipedia.org/wiki/Antenna_(electronics)http://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Signalling_(telecommunication)http://en.wikipedia.org/wiki/Radiohttp://en.wikipedia.org/wiki/Televisionhttp://en.wikipedia.org/wiki/Telecommunicationshttp://en.wikipedia.org/wiki/Electronicshttp://en.wikipedia.org/wiki/Machinehttp://en.wikipedia.org/wiki/Antenna_(electronics)http://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Signalling_(telecommunication)http://en.wikipedia.org/wiki/Radiohttp://en.wikipedia.org/wiki/Televisionhttp://en.wikipedia.org/wiki/Telecommunications8/4/2019 Application of digital signal processing in Radio transmitter, CDMA, GSM, Optical fiber, DTH communication
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processing chips, field programmable gate
arrays (FPGA),application-specific
integrated circuits (ASICs), and high-
performance analog-to-digital and digital-
to-analog converters (ADC and DAC
respectively).The DSP based hardwareextend the range and performance of RF
transmitters.
CDMA communication
Code-Division Multiple Access (CDMA)
consistently provides better capacity for
voice and data communications.Mobile
communication which started in the 80s
with an analog system provide higher
quality service with the 2
nd
generationdigital systems such as IS-95 CDMA
(Code Division Multiple Access), GSM
(Global System for Mobile
Communication). With the increasing
number of cell phone mobile
communication focused on data
transmission service is expected to be used
more universally. In mobile
communications very complicated digital
signal processing techniques are being
implemented to improve the transmissionrate and the quality of service while
increasing the number of subscribers. In
these techniques various design
methodologies, algorithms are involved.
The different type of signal processing
involved are antenna signal processing,
transceiver signal processing, and speech
processing In the transceiver, signal
processing method to remove multiple
access interference in CDMA is
incorporated, in antenna signal processing,smart antenna based on array of antenna is
expected to be utilized, and in speech
processing, more efficient and high
performance vocoders and speech
recognition systems are expected to be
provide. In gsm the signal processing are
involved
DTH Communication:
DTH is another form of satellite television.
This is the Direct to Home service where
we can see the television with super
quality of picture and sound. In this alsovarious type of signal processing involved.
A Satellite contribution link or service is a
means to transport video programming by
a satellite link from a remote source (such
as an outside broadcast unit) to a
broadcaster's studio or from the studio to a
satellite TV uplink centre Such
contribution links are often made by
terrestrial connections (landline, fibre, etc)
but the use of a satellite "hop" provides
advantages in some situations. Satelliteoperators and third party agencies provide
satellite contribution links for the
occasional or regular use of the client
broadcasters. In remote locations, using
terrestrial links such as fibre is
prohibitively expensive whereas satellite
can cheaply and easily overcome the "first-
mile" connectivity gaps in rural and other
remote areas. Whereas a contribution link
from a studio to a DTH uplink centre is
usually provided within a single satellitefootprint, the Astra 4A/Sirius 4 satellite
provides for an innovative intercontinental
contribution link service using a single Ka-
band transponder with a European
footprint and a Ku-band transponder
serving southern Africa. Contribution
feeds can be transferred from one region to
the other and in one frequency band to the
other, in a single satellite hop.
Optical Fibre communication:
An optical fibre (or fibre) is a glass or
plastic fiber that carries light along its
length. Fiber optics is the overlap of
applied science and engineering concerned
with the design and application of optical
fibers. Optical fibers are widely used in
fiber-optic communications, which permits
transmission over longer distances and at
higherbandwidths (data rates) than other
forms of communications. Fibers are usedinstead of metal wires because signals
http://en.wikipedia.org/wiki/Outside_broadcasthttp://en.wikipedia.org/wiki/Satellitehttp://en.wikipedia.org/wiki/Uplinkhttp://en.wikipedia.org/wiki/Landlinehttp://en.wikipedia.org/wiki/Fiber-optic_communicationhttp://en.wikipedia.org/wiki/Hop_(telecommunications)http://en.wikipedia.org/wiki/Last_milehttp://en.wikipedia.org/wiki/Last_milehttp://en.wikipedia.org/wiki/Footprint_(satellite)http://en.wikipedia.org/wiki/Astra_4Ahttp://en.wikipedia.org/wiki/Sirius_(satellite)http://en.wikipedia.org/wiki/Glasshttp://en.wikipedia.org/wiki/Plastichttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Applied_sciencehttp://en.wikipedia.org/wiki/Engineeringhttp://en.wikipedia.org/wiki/Fiber-optic_communicationhttp://en.wikipedia.org/wiki/Bandwidth_(computing)http://en.wikipedia.org/wiki/Outside_broadcasthttp://en.wikipedia.org/wiki/Satellitehttp://en.wikipedia.org/wiki/Uplinkhttp://en.wikipedia.org/wiki/Landlinehttp://en.wikipedia.org/wiki/Fiber-optic_communicationhttp://en.wikipedia.org/wiki/Hop_(telecommunications)http://en.wikipedia.org/wiki/Last_milehttp://en.wikipedia.org/wiki/Last_milehttp://en.wikipedia.org/wiki/Footprint_(satellite)http://en.wikipedia.org/wiki/Astra_4Ahttp://en.wikipedia.org/wiki/Sirius_(satellite)http://en.wikipedia.org/wiki/Glasshttp://en.wikipedia.org/wiki/Plastichttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Applied_sciencehttp://en.wikipedia.org/wiki/Engineeringhttp://en.wikipedia.org/wiki/Fiber-optic_communicationhttp://en.wikipedia.org/wiki/Bandwidth_(computing)8/4/2019 Application of digital signal processing in Radio transmitter, CDMA, GSM, Optical fiber, DTH communication
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travel along them with less loss, and they
are also immune to electromagnetic
interference. Fibers are also used for
illumination, and are wrapped in bundles
so they can be used to carry images, thus
allowing viewing in tight spaces. Speciallydesigned fibers are used for a variety of
other applications, including sensors and
fiber lasers. Fibre-optic communication is
a method of transmitting information from
one place to another by sending pulses of
light through an optical fiber. The light
forms an electromagneticcarrier wave that
is modulated to carry information.
http://en.wikipedia.org/wiki/Attenuationhttp://en.wikipedia.org/wiki/Electromagnetic_interferencehttp://en.wikipedia.org/wiki/Electromagnetic_interferencehttp://en.wikipedia.org/wiki/Electromagnetic_interferencehttp://en.wikipedia.org/wiki/Sensorhttp://en.wikipedia.org/wiki/Fiber_laserhttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Optical_fiberhttp://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Carrier_wavehttp://en.wikipedia.org/wiki/Modulationhttp://en.wikipedia.org/wiki/Attenuationhttp://en.wikipedia.org/wiki/Electromagnetic_interferencehttp://en.wikipedia.org/wiki/Electromagnetic_interferencehttp://en.wikipedia.org/wiki/Sensorhttp://en.wikipedia.org/wiki/Fiber_laserhttp://en.wikipedia.org/wiki/Lighthttp://en.wikipedia.org/wiki/Optical_fiberhttp://en.wikipedia.org/wiki/Electromagnetic_radiationhttp://en.wikipedia.org/wiki/Carrier_wavehttp://en.wikipedia.org/wiki/ModulationRecommended