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<h1 id="pulse-transmission-between-software-defined-radios-sdrs">Pulse Transmission between Software-Defined Radios (SDRs)</h1>
<p>In this notebook, we will walk through setup and operation of SDRs to transmit pulse train data for pulsar signal simulation.</p>
<h2 id="checking-sdr-connectivity">Checking SDR Connectivity</h2>
<p>To start, it is necessary to make sure you have successfully mounted the SDRs to your PC via USB. You can check this by executing the following commands in a command prompt:</p>
<div class="language-text highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a># ping 192.168.2.1
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a># ping 192.168.2.2
</span></code></pre></div>
<p>For each of these commands, you should see four data packets successfully sent to the SDR and received back by the PC.</p>
<p>Next, it will be necessary to check that both SDRs can transmit and receive data <i>to themselves</i>. You can do so by executing the following code. Before running this code, make sure both SDRs are mounted to your PC and have been pinged successfully, and that each one has a BNC cable connecting its Rx port to its Tx port.</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="kn">import</span> <span class="nn">adi</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="kn">import</span> <span class="nn">sdr_io</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="n">sample_rate</span> <span class="o">=</span> <span class="mf">1e6</span> <span class="c1"># Hz</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="n">center_freq</span> <span class="o">=</span> <span class="mf">915e6</span> <span class="c1"># Hz</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="n">tx_data</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s1">&#39;test_vec.npy&#39;</span><span class="p">)</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="n">tx_length</span> <span class="o">=</span> <span class="mi">5000</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="n">plot_rx_pulse_train</span> <span class="o">=</span> <span class="kc">True</span>
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="n">plot_rx_samples</span> <span class="o">=</span> <span class="kc">True</span>
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="n">plot_fft</span> <span class="o">=</span> <span class="kc">True</span>
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="n">check_fid</span> <span class="o">=</span> <span class="kc">True</span>
</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a>
</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a><span class="n">sdr1</span> <span class="o">=</span> <span class="s2">&quot;ip:192.168.2.1&quot;</span>
</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="n">sdr2</span> <span class="o">=</span> <span class="s2">&quot;ip:192.168.2.2&quot;</span>
</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a>
</span><span id="__span-1-20"><a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a><span class="n">sdr_io</span><span class="o">.</span><span class="n">sdr_tx_rx</span><span class="p">(</span><span class="n">sample_rate</span><span class="p">,</span><span class="n">center_freq</span><span class="p">,</span>
</span><span id="__span-1-21"><a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a> <span class="n">sdr1</span><span class="p">,</span><span class="n">sdr1</span><span class="p">,</span>
</span><span id="__span-1-22"><a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a> <span class="n">tx_data</span><span class="p">,</span><span class="n">tx_length</span><span class="p">,</span>
</span><span id="__span-1-23"><a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a> <span class="kc">False</span><span class="p">,</span><span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
</span><span id="__span-1-24"><a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a>
</span><span id="__span-1-25"><a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a><span class="n">sdr_io</span><span class="o">.</span><span class="n">sdr_tx_rx</span><span class="p">(</span><span class="n">sample_rate</span><span class="p">,</span><span class="n">center_freq</span><span class="p">,</span>
</span><span id="__span-1-26"><a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a> <span class="n">sdr2</span><span class="p">,</span><span class="n">sdr2</span><span class="p">,</span>
</span><span id="__span-1-27"><a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a> <span class="n">tx_data</span><span class="p">,</span><span class="n">tx_length</span><span class="p">,</span>
</span><span id="__span-1-28"><a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a> <span class="kc">False</span><span class="p">,</span><span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
</span></code></pre></div>
<p>Now that you have verified both SDRs can transmit and receive data to and from your PC, connect the Tx port of the "X-RAY EMITTER" SDR to the Rx port of the "X_RAY DETECTOR" SDR and execute the following code. This will transmit the same test pulse as above, but between the two SDRs instead of within each one.</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="n">sdr_io</span><span class="o">.</span><span class="n">sdr_tx_rx</span><span class="p">(</span><span class="n">sample_rate</span><span class="p">,</span><span class="n">center_freq</span><span class="p">,</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a> <span class="n">sdr1</span><span class="p">,</span><span class="n">sdr2</span><span class="p">,</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a> <span class="n">tx_data</span><span class="p">,</span><span class="n">tx_length</span><span class="p">,</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a> <span class="n">plot_rx_pulse_train</span><span class="p">,</span><span class="n">plot_rx_samples</span><span class="p">,</span><span class="n">plot_fft</span><span class="p">,</span><span class="n">check_fid</span><span class="p">)</span>
</span></code></pre></div>
<p><img alt="png" src="../output_3_0.png" /></p>
<p><img alt="png" src="../output_3_1.png" /></p>
<p><img alt="png" src="../output_3_2.png" /></p>
<div class="language-text highlight"><pre><span></span><code>Out of phase by 1141
Success! Perfect Transmission!
</code></pre></div>
<p>Once you have verified that the SDRs can communicate with one another, you are ready to proceed with data transmission.</p>
<h2 id="transmitting-pulsar-simulation-data">Transmitting Pulsar Simulation Data</h2>
<p>After generating a pulse train from the OpenXNAV software, transmit it from the "Emitter" SDR to the "Detector" SDR by loading it through the code below.</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="n">tx_data_name</span> <span class="o">=</span> <span class="s2">&quot;pulsar_vec.npy&quot;</span> <span class="c1"># insert filename for pulse train here</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="n">tx_data</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">tx_data_name</span><span class="p">)</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="n">tx_data</span> <span class="o">=</span> <span class="n">tx_data</span><span class="p">[:</span><span class="mi">5000</span><span class="p">]</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="n">tx_length</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">tx_data</span><span class="p">)</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="n">plot_rx_samples</span> <span class="o">=</span> <span class="kc">True</span> <span class="c1"># once connectivity and fidelic transmission is verified,</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a> <span class="c1"># this is redundant</span>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="n">plot_fft</span> <span class="o">=</span> <span class="kc">True</span> <span class="c1"># no longer concerned with freq domain - only concerned </span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a> <span class="c1"># with transmitted pulses</span>
</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a><span class="n">check_fid</span> <span class="o">=</span> <span class="kc">True</span> <span class="c1"># we have already verified connectivity - no need to check again</span>
</span><span id="__span-3-11"><a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Transmitted data&quot;</span><span class="p">)</span>
</span><span id="__span-3-12"><a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">tx_data</span><span class="p">)</span>
</span><span id="__span-3-13"><a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
</span><span id="__span-3-14"><a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a><span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Received data&quot;</span><span class="p">)</span>
</span><span id="__span-3-15"><a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a><span class="n">sdr_io</span><span class="o">.</span><span class="n">sdr_tx_rx</span><span class="p">(</span><span class="n">sample_rate</span><span class="p">,</span><span class="n">center_freq</span><span class="p">,</span>
</span><span id="__span-3-16"><a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a> <span class="n">sdr1</span><span class="p">,</span><span class="n">sdr2</span><span class="p">,</span>
</span><span id="__span-3-17"><a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></a> <span class="n">tx_data</span><span class="p">,</span><span class="n">tx_length</span><span class="p">,</span>
</span><span id="__span-3-18"><a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></a> <span class="n">plot_rx_pulse_train</span><span class="p">,</span><span class="n">plot_rx_samples</span><span class="p">,</span><span class="n">plot_fft</span><span class="p">,</span><span class="n">check_fid</span><span class="p">)</span>
</span></code></pre></div>
<div class="language-text highlight"><pre><span></span><code>Transmitted data
</code></pre></div>
<p><img alt="png" src="../output_5_1.png" /></p>
<div class="language-text highlight"><pre><span></span><code>Received data
</code></pre></div>
<p><img alt="png" src="../output_5_3.png" /></p>
<p><img alt="png" src="../output_5_4.png" /></p>
<p><img alt="png" src="../output_5_5.png" /></p>
<div class="language-text highlight"><pre><span></span><code>Out of phase by 2890
Success! Perfect Transmission!
</code></pre></div>
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