Application of digital signal processing in Radio transmitter, CDMA, GSM, Optical fiber, DTH communication

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/Telecommunications


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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)


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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/Modulation

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Application of digital signal processing in Radio transmitter, CDMA, GSM, Optical fiber, DTH communication