




Students fill in missing lines of code to create a Matlab simulation of a foursymbol frequency shift keying (FSK) transmitter. Students are encouraged to change the symbol period and observe the change in the transmitted signal's spectrum.
Prelab: matlab preparation
We have made considerable use of Matlab in previous labs to
design filters and determine frequency responses of systems.Matlab is also very useful as a simulation tool.
Use the following Matlab code skeleton to simulate your system
and fill in the incomplete portions. Note that the code is notcomplete and will not execute properly as written. How does the
spectrum of the transmitted signal change with
${T}_{\mathrm{symb}}$ ?
lab_5_prelab.m
1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2 % Matlab code skeleton for Digital Transmitter
3
4 close all;clear;
5
6 % Generate random bits
7 bits_per_symbol=2;
8 num_symbols=64;
9 numbits=bits_per_symbol*num_symbols;
10 bits=rand(1,numbits)>0.5;
11
12 Tsymb=32; % samples per symbol
13
14
15 % These are the 4 frequencies to choose from
16 % Note that 32 samples per symbol does not correspond to
17 % an integer number of periods at these frequencies
18 omega1 = 9*pi/32;
19 omega2 = 13*pi/32;
20 omega3 = 17*pi/32;
21 omega4 = 21*pi/32;
22
23
24 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
25 % Transmitter section
26
27 % Initialize transmit sequence
28 index=1; % Initialize bit index
29 n=1; % Initialize sample index
30 phi=0; % Initialize phase offset
31
32 % Generate 64 32sample symbols
33 while (n<=num_symbols*Tsymb)
34
35 if (bits(index:index+1) == [0 0])
36 sig(n:n+Tsymb1) = sin(omega1*[0:Tsymb1]+phi);
37 phi = omega1*Tsymb+phi; % Calculate phase offset for next symbol
38 phi = mod(phi, 2*pi); % Restrict phi to [0,2*pi)
39
40 % > Insert code here <%
41
42 end % end ifelse statements
43
44 index=index+2; % increment bit counter so we look at next 2 bits
45
46 n=n+Tsymb;
47 end % end while
48
49
50 % Show transmitted signal and its spectrum
51 % > Insert code here <%
Questions & Answers
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?
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
nano basically means 10^(9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
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?
Damian
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.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
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
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
what's the easiest and fastest way to the synthesize AgNP?
how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:
OpenStax, Ece 320 spring 2004. OpenStax CNX. Aug 24, 2004 Download for free at http://cnx.org/content/col10225/1.12
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