Changes between Version 30 and Version 31 of Other/Summer/2015/aSDR3


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Timestamp:
Jul 23, 2015, 4:12:18 AM (10 years ago)
Author:
catle3006
Comment:

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  • Other/Summer/2015/aSDR3

    v30 v31  
    7676
    7777=== Analyzing Tools ===
     78===== Spectrum Analyzer  =====
     79Hardware Spectrum Analyzer - Tektronix SA2600:
     80* Wire measurement must be connect with 30dB attenuator in order to avoid saturation
     81* Wireless measurement requires much higher gain than using wire
     82{{{#!html
     83<table align=center cellpadding=10 width=50%>
     84  <tr>
     85    <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Tektronix.png" height=300><center></td>
     86  </tr>
     87  <tr>
     88    <td><center><b>Figure 2. Tektronix SA2600<b><center></td>
     89  </tr>
     90</table>
     91}}}
     92
     93Software Spectrum Analyzer - RTLSDR Scanner:
     94 * PROS: user-friendly, convenient, remote access, software-based spectrum analyzer
     95 * CONS: Realtek 2832 EZCap can’t tune to frequencies higher than 1.8GHz
     96
     97{{{#!html
     98<table align=center cellpadding=10 width=50%>
     99  <tr>
     100    <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/RTLSDR.png" height=250><center></td>
     101  </tr>
     102  <tr>
     103    <td><center><b>Figure 3. RTLSDR Scanner<b><center></td>
     104  </tr>
     105</table>
     106}}}
     107
    78108===== GNU Radio  =====
    79 
    80 ===== Spectrum Analyzer  =====
    81 * Hardware Spectrum Analyzer - Tektronix SA2600
    82 
    83 {{{#!html
    84 <table align=center cellpadding=10 width=50%>
    85   <tr>
    86     <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/Tektronix.png" height=300><center></td>
    87   </tr>
    88   <tr>
    89     <td><center><b>Figure 2. Tektronix SA2600<b><center></td>
    90   </tr>
    91 </table>
    92 }}}
    93 
    94 * Software Spectrum Analyzer - RTLSDR Scanner
    95   * PROS: user-friendly, convenient, remote access, software-based spectrum analyzer
    96   * CONS: Realtek 2832 EZCap can’t tune to frequencies higher than 1.8GHz
    97 
    98 {{{#!html
    99 <table align=center cellpadding=10 width=50%>
    100   <tr>
    101     <td><center><img src="http://www.orbit-lab.org/raw-attachment/wiki/Other/Summer/2015/aSDR3/RTLSDR.png" height=250><center></td>
    102   </tr>
    103   <tr>
    104     <td><center><b>Figure 3. RTLSDR Scanner<b><center></td>
    105   </tr>
    106 </table>
    107 }}}
    108 
     109GNU Radio is an important tool to obtain the Waterfall Plot.
     110[http://www.orbit-lab.org/attachment/wiki/Other/Summer/2015/aSDR3/Necessary_Commands_Links_GNU.docx.pdf How to use GNU Radio]
    109111===== Signal-to-Noise Ratio (SNR)  =====
    110 There are 2 methods to approximate the SNR.
    111 
     112There are 2 methods to approximate the SNR:
    112113* Method 1:  Estimate the noise power by measure the received signal power when transmitter is turned off.
    113 
    114114* Method 2: Estimate the noise power by calculate the received signal variance.
    115115
    116 noise = variance = mean ( signal - mean ( signal ) )
    117 
    118 noise [dB] = 10 log (noise power)
    119 
    120 signal [dB] = 10 log (signal power)
    121 
    122 SNR = signal power / noise power
    123 
    124 SNR [dB] = signal [dB] - noise [dB]
     116The relationship between signal, noise, SNR:
     117* noise = variance = mean ( signal - mean ( signal ) )
     118* noise [dB] = 10 log (noise power)
     119* signal [dB] = 10 log (signal power)
     120* SNR = signal power / noise power
     121* SNR [dB] = signal [dB] - noise [dB]
     122
     123MATLAB code to measure SNR:
    125124
    126125=== Experiments ===
    … …  
    187186[http://www.orbit-lab.org/attachment/wiki/Other/Summer/2015/aSDR3/Week_8.pdf Presentation: Week 8]
    188187
     188[http://www.orbit-lab.org/attachment/wiki/Other/Summer/2015/aSDR3/Week_9.pdf Presentation: Week 9]
     189
     190[http://www.orbit-lab.org/attachment/wiki/Other/Summer/2015/aSDR3/Week_10.pdf Presentation: Week 10]
     191
     192[http://www.orbit-lab.org/attachment/wiki/Other/Summer/2015/aSDR3/Week_11.pdf Presentation: Week 11]
     193
     194[http://www.orbit-lab.org/attachment/wiki/Other/Summer/2015/aSDR3/Week_12.pdf Presentation: Week 12]
    189195=== Resources ===
    190196[http://www.nctatechnicalpapers.com/Paper/2014/2014-lte-unlicensed-augmenting-mobile-data-capacity-but-coexistence-needs-consideration LTE Unlicensed Augmenting Mobile Data Capacity But Coexistence Needs Consideration]