# 6.9 Baseband communication

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Baseband communication is the simplest form of analog communication.

We use analog communication techniques for analog message signals, like music, speech, and television. Transmission andreception of analog signals using analog results in an inherently noisy received signal (assuming the channel addsnoise, which it almost certainly does).

The simplest form of analog communication is baseband communication .

We use analog communication techniques for analog message signals, like music, speech, andtelevision. Transmission and reception of analog signals using analog results in an inherently noisy received signal(assuming the channel adds noise, which it almost certainly does).
Here, the transmitted signal equals the message times a transmitter gain.
$x(t)=Gm(t)$
An example, which is somewhat out of date, is the wireline telephone system. You don't use baseband communication inwireless systems simply because low-frequency signals do not radiate well. The receiver in a baseband system can't do muchmore than filter the received signal to remove out-of-band noise (interference is small in wireline channels). Assuming thesignal occupies a bandwidth of $W$ Hz (the signal's spectrum extends from zero to $W$ ), the receiver applies a lowpass filter having the same bandwidth, as shown in [link] .

We use the signal-to-noise ratio of the receiver's output $\stackrel{^}{m}(t)$ to evaluate any analog-message communication system. Assume that the channel introduces an attenuation $\alpha$ and white noise of spectral height $\frac{{N}_{0}}{2}$ . The filter does not affect the signal component—we assume its gain is unity—but does filter the noise,removing frequency components above $W$ Hz. In the filter's output, the received signal power equals $\alpha ^{2}G^{2}\mathrm{power}(m)$ and the noise power ${N}_{0}W$ , which gives a signal-to-noise ratio of

${\mathrm{SNR}}_{baseband}=\frac{\alpha ^{2}G^{2}\mathrm{power}(m)}{{N}_{0}W}$
The signal power $\mathrm{power}(m)$ will be proportional to the bandwidth $W$ ; thus, in baseband communication the signal-to-noise ratio variesonly with transmitter gain and channel attenuation and noise level.

Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
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nano basically means 10^(-9). nanometer is a unit to measure length.
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do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
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how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
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for teaching engĺish at school how nano technology help us
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Do somebody tell me a best nano engineering book for beginners?
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what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
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That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
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is Bucky paper clear?
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carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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so some one know about replacing silicon atom with phosphorous in semiconductors device?
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Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
how did you get the value of 2000N.What calculations are needed to arrive at it
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