Activities

Modify the

Addition.java

class (

or some other program as you see fit

, or start from scratch) to implement Shannon's

Theorem to compute the Capacity "

C" (

maximum data rate), of a communications channel, given the Bandwidth "

B"

,

and Signal-to-Noise Ratio "

SNR"

. Output your results using the

JOptionpane.showMessageDialog()

method (also use

JOptionpane for input of values). The maximum data rate

should be returned as a deci

mal number with two decimal

places of precision (clues may be fou

nd in your text book or the "Really big

index" regarding decimal places to

display).

Function to apply Shannon's Theorem for capacity:

MDR = (H) [log2(1 + s)]

Where:

MDR

= maximum data rate

H

= bandwidth in Herz

S/N

= signal to noise (SNR)

Assume

S/N

is in decibels

dB

. The signal-to-noise ratio uses a signal power

S

and the noise power

N

,

the signal-to-noise ra

tio is shown as

S/N.

The ratio itself is not quoted;

rather the quantity 10 log(10)

S/N

is given. These units are called decibels

dB

. An

S/N

ratio of 10 is

10 dB

, a ratio of 100 is

20 dB

,

a ratio of 1000 is

30 dB

...

So ...

Let x = log2(1+SNR) then MDR = (H) * (x)

Now solve for x ???

Documentation

Make sure you run javadoc against your source code and

have the documentation files placed in a folder called

"docs".

The command in a DOS window woul

d be >javadoc -d docs *.java

... assuming all source files are in the de

fault folder where you execute javadoc.

Testing

Your program should be thoroughly unit

tested using the JUnit testing fram

ework. You must use the provided

skeleton for Junit test classes and add the Junit jar file as

an external JAR to your Eclipse Project (ensure you follow

the test class naming conventions implemented in the skel

eton classes). The skeleton

classes (ShannonsSample) and

test classes are not intended to implement your requirement

s for this lab. Place your sour

ce code in a package named

network and your JUnit test classes (AllTests.j

ava and Test_ShannonsTheorm) in a package named

networktest. Make sure among other te

sts, you include a test for the standard

parameters of a telephone line. The

following zip file contains a sample to illustra

tes the setup for your project, (see attached

ShannonsSample.zip

).

Tests should consist not only of va

lid data but also invalid data.

You may follow the directory structure of the provided sa

mple. The "junit.jar" file must be in your "classpath"

environment variable, or

defined thru your IDE tool

. My class path was set as pe

r the following statements. (you

may pick the latest version of Junit if you wish)

set JUNIT_HOME=c:\javaaddons\junit3.8.1

set classpath=.;%JUNIT_HOME%\junit.jar

Each IDE handles additions to

the classpath differently, refer to th

e documentation for your IDE tool.

UML:

Shannons Theorem Theorem bandwidth double signal Tol oise double Class to implement Shannon's Theorem for network capacity. This class contains attributes forthe signal to +getBandwidth0 double ue and the bandwidth value. It s both accessors and modifiers for those a butes noise latio va also contain getMaximumDataRate( hentz double, signalToNoise double double getset pattern). You must also factor the netwo capacity caluciation into its own method. +getMaximum Data Rate0 double getiMaximumDataRate0. +getSignalToNoise0 double The main0 method instantiates the class ShannonsTheorem. +setBandwidth h double void +setSignalToNoise( snr double): void eg. ShannonsTheorem shannons a new ShannonsTheore Theorem +Shannons Theorem0 +toString0 String This creates an instance of the class, making instance members available from the within the static ma method The calculation of maximum data rate can be found in the method getiMaximumDataRate(double. double) HINT The method get MaximumDataRate0 (absent of any arguments) has been overriden by the method that accepts arguments. The implementation of the public method would invoke the private method passing the instance values for bandwidth and signalto-noise. MORE H) [l og2 Where MDR maximum data rate bandwidth in Herz signal to noise (SNR SIN e.g. (hz math math.log(2) Notice that e only static member(s) are e maino method As a standard for all java classes. a toS go method has been overridden and should provide a meaningful string that Iepresents the class. Quite often this involves returning the attributes and their values in some meaningful format