wiki:2011/Projects/NC-OFDM

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<html> <title>NC- OFDM</title> <head> <style type="text/css"> body { background-color:#382D2C; } a { display:inline; font-weight:bold; color: white; background-color:#B93B8F; width:120px; text-align: justify; font-family:"Verdana"; padding:10 px; text-decoration:none; } h2 { font-family:"Arial"; font-size: 25 px; color:white; text-align:center; } p { text-align: justify; color: white; font-family:"Arial"; font-size:18px; } li { text-align: justify; color: white; font-family:"Arial"; font-size: 20px; } </style> </head> <body> <br/> <br/> <h2> Non Contiguous Orthogonal Frequency Division Multiplexing</h2> <div> <center> <br /><br/> <a href = "file:///C:/webpagedevp/webpage.html">Home</a> <a href = "file:///C:/webpagedevp/webpageprojectdescription.html">Project Description</a> <a href = "file:///C:/webpagedevp/webpageteammembers.html">Team Member(s)</a> <a href = "url">Winlab group meeting slides</a> <a href = "http://www.winlab.rutgers.edu/Summer">Winlab summer project homepage</a> </center> </div> <br/><br/> <h2>

Project Description

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The final goal of my project is NC OFDM transmission and reception. This page describes my progress in the project and the various things I learnt in the process.

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<ul> <li> Getting acquainted with LabVIEW</li> <br/> <p> As in any project , the first step is to get acquainted with the software. The software toolkit for the NI PXIe setup is LabVIEW 2010. To draw a rough comparison, LabVIEW is very much like the simulink blockset in MATLAB the only

exception being LabVIEW has many more functional tools( Signal processing, Matrix operations, RF Communications etc.) . The front end of LabVIEW is pretty much like a CRO. It has controls, indicators, graphs on the front panel and the actual control logic flow is built at the rear panel. The following images will give you a clearer idea. </p> <img src="file:///C:/webpagedevp/LVFP.jpg" width="300" height="300" /> &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp <img src="file:///C:/webpagedevp/LVBP.jpg" width="300" height="300" /> <p> <p> Front Panel &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp Rear Panel </p> <li> Playing around with LabVIEW</li> <p>

Before going into the actual implementation of the OFDM, I did a few simulation experiments on LabVIEW. I developed an M- ary communications system which employed M-PSK and M- ASK. The purpose behind doing these simulations was

just to get a hang of the software. I also went ahead and simulated OFDM with a mask. To check whether the simulations make sense, I plotted a BER curve for the simulated communications system. </p> <p> <img src="file:///C:/webpagedevp/2416PSK.jpg" width="600" height="400" /> </p> <li> NC- OFDM Simulation </li> <p>

Before actually going towards the Real time Implementation, It was necessary to know how your waveforms look like. I did an NC- OFDM simulation assuming an AWGN channel with an SNR of 8 dB. LabVIEW has a very good simulation environment and it has any tools which emulate real environment

specifications. The transmitted and received signal amplitude v/s subcarrier index graphs are as shown in the figure

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<img src="file:///C:/webpagedevp/OFDMsignal5V.jpg" width="600" height="400" /> </p>

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