Changes between Version 1 and Version 2 of 2011/Projects/NC-OFDM


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Timestamp:
Jul 29, 2011, 1:03:10 PM (6 years ago)
Author:
ajayiyer
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  • 2011/Projects/NC-OFDM

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    1 <html> 
    2 <title>NC- OFDM</title> 
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    43 </head> 
    44 <body> 
    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 
    71 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  
    72 panel 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" /> 
    76 <p> 
    77 <p> 
    78 Front 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 
    80 Rear 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 
    85 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.   
    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" /> 
    98 </p>  
    99  
    100  
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