Changes between Version 49 and Version 50 of Other/Summer/2015/aSDR3


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Timestamp:
Jul 31, 2015, 3:29:35 AM (9 years ago)
Author:
catle3006
Comment:

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  • Other/Summer/2015/aSDR3

    v49 v50  
    3636Each repository focuses on a different data communication layer or focus of 3GPP implementation.
    3737
    38 {{{#!html
    39 <table align=center cellpadding=10 width=50%>
    40   <tr>
    41     <td><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/OpenAirInterface.png" height=350></td>
    42   </tr>
    43   <tr>
    44     <td><center><b>Figure 1. OpenAir LTE Protocol<b><center></td>
    45   </tr>
    46 </table>
    47 }}}
     38[[Image(http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/OpenAirInterface.png, height=350, center)]]
    4839
    4940===== OpenAir1 [http://svn.eurecom.fr/openair4G/releases/rel_0.1_26.10.2014/openair1/ Code] =====
    … …  
    10899|-----------------------------------------------------------
    109100||= [#Graph Graphs] =||\
    110 || [[Image(http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Tektronix.png, height=300, center)]] ||\
    111 || [[Image(http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/RTLSDR.png, height=300, center)]]  ||
     101|| [[Image(http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Tektronix(1).png, height=300, center)]] ||\
     102|| [[Image(http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/RTLSDR(1).png, height=300, center)]]  ||
    112103|-----------------------------------------------------------
    113104
    … …  
    120111
    121112* `Method 2` Estimate the noise power by calculating the received signal variance.
    122 [[Image(http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/SNR.png, width=120, center)]]
    123 
    124 MATLAB code to measure SNR:
     113[[Image(http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/SNR.png, width=180, center)]]
     114
     115SNR Estimation MATLAB Program:
     116
    125117
    126118=== Experiments 1: Transmit and Receive LTE Signal ===
    127 The experiment is simulated in Sandbox 1 with USRP Hardware Driver (UHD) using OAI software.
    128 
    129 {{{#!html
    130 <table align=center cellpadding=10 width=50%>
    131   <tr>
    132     <td><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp1.1.png" height=250></td>
    133     <td><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp1.2.png" height=250></td>
    134   </tr>
    135   <tr>
    136     <td colspan="2"><center><b>Figure 4. Received LTE Signal<b><center></td>
    137   </tr>
    138 </table>
    139 }}}
     119The experiment is simulated in Sandbox 1 with `USRP Hardware Driver` (UHD) using `OpenAirInterface` (OAI) software.
     120
     121{{{#!html
     122<table align=center cellpadding=10 width=50%>
     123  <tr>
     124    <td><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp1.1.png" height=230></td>
     125    <td><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp1.2.png" height=230></td>
     126  </tr>
     127  <tr>
     128    <td colspan="2"><center><b>Figure 1a. Received LTE Signal ASCII Plot<b><center></td>
     129  </tr>
     130</table>
     131}}}
     132
     133The left figure shows the overview of the received LTE signal: the carrier and the sidebands. The right figure indicates clearly that there are noises in both the carrier and the sideband.
     134
     135The SNR can be quickly estimated by taking the average of the carrier or (around -50dB) and subtract by the average of the sideband (around -90dB). Thus, the SNR should be approximately 40dB.
     136
     137The SNR calculated by the MATLAB Program gives a very close result: ...dB
    140138
    141139{{{#!html
    … …  
    146144  </tr>
    147145  <tr>
    148     <td colspan="2"><center><b>Figure 5. I/Q Samples<b><center></td>
     146    <td colspan="2"><center><b>Figure 1b. I/Q Samples<b><center></td>
    149147  </tr>
    150148</table>
    … …  
    154152* '''PSS''' ''Primary Synchronization Signal''
    155153* '''SSS''' ''Secondary Synchronization Signal''
    156 * '''CFI'''
    157 * '''CSRS'''
     154* '''CFI''' ''Control Format Indicator''
     155* '''CSRS''' 
    158156
    159157=== Experiment 2: The Waterfall Plot ===
     158The experiment is simulated in GNU Radio and Spectrum Analyzer (Tektronix SA2600) after activating the LTE eNB Base Station to transmit signal.
     159 
    160160{{{#!html
    161161<table align=center cellpadding=10 width=50%>
    … …  
    164164  </tr>
    165165  <tr>
    166     <td><center><b>Figure 6. Block Diagram<b><center></td>
     166    <td><center><b>Figure 2a. GNU Radio Block Diagram<b><center></td>
    167167  </tr>
    168168</table>
    … …  
    173173  <tr>
    174174    <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp2.2.jpg" height=300><center></td>
    175    <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp2.3.jpg" height=300><center></td>
    176   </tr>
    177   <tr>
    178     <td colspan="2"><center><b>Figure 7. Constellation and FFT Plot<b><center></td>
     175  </tr>
     176  <tr>
     177    <td><center><b>Figure 2b. The Constellation Plot<b><center></td>
     178  </tr>
     179</table>
     180}}}
     181
     182{{{#!html
     183<table align=center cellpadding=10 width=50%>
     184  <tr>
     185     <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp2.3.jpg" height=300><center></td>
     186     <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp2.6.jpg" height=300><center></td>
     187  </tr>
     188  <tr>
     189    <td><center><b>Figure 2c. The FFT obtained from GNU Radio (left) and Tektronix SA2600 (right)<b><center></td>
    179190  </tr>
    180191</table>
    … …  
    185196  <tr>
    186197    <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp2.4.jpg" height=200><center></td>
    187    <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp2.5.jpg" height=200><center></td>
    188   </tr>
    189   <tr>
    190     <td colspan="2"><center><b>Figure 8. Waterfall Plot<b><center></td>
     198   <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Exp2.7.jpg" height=200><center></td>
     199  </tr>
     200  <tr>
     201    <td colspan="2"><center><b>Figure 8. The Waterfall Plot obtained from GNU Radio (left) and Tektronix SA2600 (right)<b><center></td>
    191202  </tr>
    192203</table>