2011/Projects/NC-OFDM: webpageprojectdescription.html

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2<title>NC- OFDM</title>
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45<br/> <br/>
46<h2> Non Contiguous Orthogonal Frequency Division Multiplexing</h2>
47<div>
48<center>
49<br /><br/> 
50<a href = "file:///C:/webpagedevp/webpage.html">Home</a>
51<a href = "file:///C:/webpagedevp/webpageprojectdescription.html">Project Description</a>
52<a href = "file:///C:/webpagedevp/webpageteammembers.html">Team Member(s)</a>
53<a href = "url">Winlab group meeting slides</a>
54<a href = "http://www.winlab.rutgers.edu/Summer">Winlab summer project homepage</a>
55</center>
56</div>
57<br/><br/>
58<h2>
59  Project Description
60</h2>
61<p>
62  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.
63<p>
64
65<br/> <br/>
66 <ul>
67 <li> Getting acquainted with LabVIEW</li>
68 <br/>
69 <p>
70 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
71exception 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
72panel and the actual control logic flow is built  at the rear panel.  The following images will give you a clearer idea.
73</p>
74<img src="file:///C:/webpagedevp/LVFP.jpg"  width="300" height="300" /> &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp
75<img src="file:///C:/webpagedevp/LVBP.jpg"  width="300" height="300" />
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77<p>
78Front Panel &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp
79&nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp
80Rear Panel
81</p>
82<li> Playing around with LabVIEW</li>
83<p>
84 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
85just 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. 
86</p>
87<p>
88<img src="file:///C:/webpagedevp/2416PSK.jpg"  width="600" height="400" />
89</p> 
90<li>  NC- OFDM Simulation </li>
91<p>
92  Before actually going towards the Real time Implementation, It was necessary to know how your waveforms look like. I did an NC- OFDM simulation
93  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
94   specifications. The transmitted and received signal amplitude v/s subcarrier index graphs are as shown in the figure
95</p>
96 <p>
97<img src="file:///C:/webpagedevp/OFDMsignal5V.jpg"  width="600" height="400" />
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