HLSI/12_pathloss_interference.html at master · vtwireless/HLSI · GitHub

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<!DOCTYPE html>
<!--
To Do: Update spectrum plot to use Lance's framework; Add path loss model menu
with 2-3 models; Replace text-based status display with bar graph that includes
text labels, and numeric values
-->
<html lang="en-US" style="display: flex;">
<head>
  <title>12 - Path Loss</title>
  <meta charset="UTF-8"/>
  <meta name="viewport" content="width=device-width"/>
  <link rel="stylesheet" type="text/css" media="all" href="base.css">
  <link rel=stylesheet type=text/css href=sidebar.css />
</head>

<body style="margin:0;">
  <!-- <h2>Exercise 12 - Path Loss with Interference</h2>
  <p><a href="index.html">[exercises]</a></p> -->

  <section class="banner" style="position: fixed; z-index: 11; background: rgba(0,0,0,0.85)">
    <label for="menu-control" class="hamburger">
      <i class="hamburger__icon"></i>
      <i class="hamburger__icon"></i>
      <i class="hamburger__icon"></i>
    </label>

    <input type="checkbox" id="menu-control" class="menu-control">

    <aside class="sidebar" style="z-index: 10;">

      <nav class="sidebar__menu">
        <a href="01_bw.html"><b>1</b> Bandwidth</a>
        <a href="02_freq.html"><b>2</b> Frequency</a>
        <a href="03_gn.html"><b>3</b> Gain</a>
        <a href="04_freq_bw_gn.html"><b>4</b> Frequency, Bandwidth, and Gain</a>
        <a href="05_capacity.html"><b>5</b> Information Capacity</a>
        <a href="06_interference.html"><b>6</b> Interference and Information Capacity</a>
        <a href="07_capacity.html"><b>7</b> Information Capacity</a>
        <a href="08_capacity.html"><b>8</b> Information Capacity</a>
        <a href="09_capacity.html"><b>9</b> Information Capacity</a>
        <a href="10_capacity.html"><b>10</b> Information Capacity</a>
        <a href="11_pathloss.html"><b>11</b> Path Loss</a>
        <a href="12_pathloss_interference.html" class="selected"><b>12</b> Path Loss with Interference</a>
        <a href="13_manual_avoidance.html"><b>13</b> Manual Interferer Avoidance</a>
        <a href="" onclick="alert('Exercise 14: reserved for future use')"><b>14</b> SAS (Spectrum Access System)</a>
        <a href="15_rule_based_avoidance.html"><b>15</b> Rule Based Interferer Avoidance</a>
        <a href="16_programmable_avoidance.html"><b>16</b> Programmable Interferer Avoidance</a>
        <a href="17_machine_learning_avoidance.html"><b>17</b> Machine Learning Interferer Avoidance</a>
        <a href="18_machine_learning_time_based_avoidance.html"><b>18</b> Machine Learning With Periodic Interferer Avoidance</a>
        <a href="19_rf_front_end_spectrum_sharing.html"><b>19</b> RF Front End Spectrum Sharing</a>
        <a href="20_rf_front_end_spectrum_sharing.html"><b>20</b> Programmable RF Front End Spectrum Sharing</a>
        <a href="21_rf_front_end_spectrum_sharing_with_interferer.html"><b>21</b> RF Front End Spectrum Sharing with Interferer</a>
        <a href="22_rf_front_end_spectrum_sharing_with_interferer.html"><b>22</b> Programmable Spectrum Sharing with Interferer</a>
        <a href="23_rf_front_end_spectrum_sharing_sliders_programmable.html"><b>23</b> RFFE Spectrum Sharing - Manual and Programmable</a>
        <a href="25_rf_front_end_spectrum_sharing_menu.html"><b>25</b> RFFE Spectrum Sharing - Calculate SINR options menu</a>
        <a href="26_rf_front_end_spectrum_sharing_ programmable.html"><b>26</b> RFFE Spectrum Sharing -- SINR Calculations Programmable</a>
      </nav>

      <label for="menu-control" class="sidebar__close"></label>


    </aside>

    <div style="margin-left: 6%; font-size: 1.3rem; margin-top: 0.3%; font-family: sans-serif; order: 1; width: inherit;"><span style="color: #ddd;">Exercise 12</span> Path Loss with Interference</div>
    <div style="order: 2; margin-left: auto; margin-right: 2%; display: flex;">
      <span style="font-size: 250%; font-family: monospace; letter-spacing: 2px; margin-left: auto; margin-right: 5px; color: #e6d9ba;"></span>
      <div style="width: 20%;">
        <img style="width: 100%;" src="images/wireless-logo.png">
      </div>
    </div>
  </section>

    <div class="content-section" id="slider_1_parent" style="margin-left: 1%; margin-top:8%;">
        <p style="color: #62B9E4"><label>Distance = </label><output id="d0"></output>, <label>Path Loss = </label><output id="L0"></output> - User</p>
        <p style="color: #EAB6B6"><label>Distance = </label><output id="d1"></output>, <label>Path Loss = </label><output id="L1"></output> - Interferer</p>
        <p>
          <label for="signal_to_int_noise_ratio">Signal to Interference &amp; Noise Ratio:  SINR = </label>
          <output for="signal_to_int_noise_ratio" id="sinr"></output>
        </p>
        <p>
          <label for="information_capacity">Information Capacity:  C = </label>
          <output for="information_capacity" id="cap"></output>
        </p>
        <p>
          <label style="color: #62B9E4" for="frequency">Frequency</label>
          <input class="width-4" type="range" min="-0.3" max="0.3" value="0.0" id="frequency" step="0.001"
              oninput="update_display(parseFloat(value))">
          <output for="frequency" id="fc"></output>
        </p>
    </div>


</body>

<!-- Load in the javascript libraries -->
<script src="d3.v5.min.js"></script>
<script src="fft.js"></script>
<script src="support.js"></script>
<script src="signal.js"></script>
<script src="iqPlot.js"></script>
<script>


// 2. Use the margin convention practice
var margin = {top: 10, right: 50, bottom: 50, left: 50}
  , width  = 720 - margin.left - margin.right  // Use the window's width
  , height = 320 - margin.top - margin.bottom; // Use the window's height

// options
var fs=40e6, f0=1800e6;    // sample rate, center frequency
var bw     = 0.3912234, fc     =  0.0,        gn     = 20;  // user values
var bw_int = 0.086, fc_int = -0.033, gn_int = 20;  // interference values
var n0 = -80, sinr = 0, cap = 10;
var xrange=1200, yrange=200; // range in meters
var xmax  =1150, ymax  =180; // maximum values
var dmin = 10;               // minimum distance between nodes for path loss calculation
var nfft = 2048, generator = new siggen(nfft);
generator.m = 80;  // set filter semi-length
generator.beta = 2;

var lambda = 299.792458e6 / (fc*fs + f0);   // wavelength in meters

// create a signal object
var sig = Signal(JSON.parse(JSON.stringify(conf.signal_multi)), '', {
    gn_init: gn, // dB
    bw_int: bw,
    fc_int: fc,
    mcs_init: 2, // array index int
  });

  // create IQ plot plot variable
  const plot = {
  width: 620,   // total svg width in px
  height: 260,  // total svg height in px
  margin: { top: 10, right: 30, bottom: 40, left: 60 }
};

// scale
var xScale = d3.scaleLinear().domain([-xrange, xrange]).range([0, width]);
var yScale = d3.scaleLinear().domain([-yrange, yrange]).range([height, 0]);

// inverted scale
var xInvScale = d3.scaleLinear().range([-xrange, xrange]).domain([0, width]);
var yInvScale = d3.scaleLinear().range([-yrange, yrange]).domain([height, 0]);

// determine time and frequency scale/units
var [scale_freq,units_freq] = scale_units(f0+fs/2,0.1); // freq scale
var fScale = d3.scaleLinear().domain([(f0-0.5*fs)*scale_freq, (f0+0.5*fs)*scale_freq]).range([0, width]);
var pScale = d3.scaleLinear().domain([-90, -20]).range([height, 0]);

// create SVG objects (map and frequency plot)
var svgm = svg_create(margin, width, height, xScale, yScale);
var svgf = svg_create(margin, width, height, fScale, pScale);

// add labels
svg_add_labels(svgm, margin, width, height, "Horizonal Position (m)", "Vertical Position (m)");
svg_add_labels(svgf, margin, width, height, "Frequency ("+units_freq+"Hz)", "Power Spectra Density (dB)");

// clip paths
svgf.append("clipPath").attr("id","clipf").append("rect").attr("width",width).attr("height",height);

// add pointer definition
var pointer = svgm.append("defs").append("g")
        .attr("id","pointer")
        .attr("transform","scale(0.8)");
pointer.append("path").attr("d","M0-1c-14.5-25.6-14.5-25.7-14.5-33.8c0-8.1,6.5-14.6,14.5-14.6s14.5,6.6,14.5,14.6C14.5-26.7,14.5-26.6,0-1z");
pointer.append("path").attr("d","M0-49c7.7,0,14,6.3,14,14.1c0,8,0,8.1-14,32.8c-14-24.7-14-24.9-14-32.8C-14-42.7-7.7-49,0-49 M0-50c-8.3,0-15,6.8-15,15.1 S-15-26.5,0,0c15-26.5,15-26.5,15-34.9S8.3-50,0-50L0-50z");

// create markers with default positions
var markers = [
    {x:xScale(-xmax), y:yScale( ymax), c:"#039be5", b:"#004080"},
    {x:xScale(    0), y:yScale(    0), c:"#03e539", b:"#008040"},
    {x:xScale(    0), y:yScale(-ymax), c:"#9d7d7d", b:"#400000"},];
// spectrum data
var dataf = d3.range(0,nfft-1).map(function(f) { return {"y": 0 } })

// d3's line generator
var line = d3.line()
    .x(function(d) { return d.x; })
    .y(function(d) { return d.y; });
var linef = d3.line()
    .x(function(d, i) { return fScale((f0+(i/nfft-0.5)*fs)*scale_freq); })  // map frequency
    .y(function(d)    { return pScale(d.y);        }); // map PSD

// Append the path, bind the data, and call the line generator
var path = svgm.append("path")
    .datum(markers)
    .attr("class", "stroke-light no-fill dashed stroke-gray-0")
    .attr("d", line);
var pathf = svgf.append("path")
    .attr("clip-path","url(#clipf)")
    .datum(dataf)
    .attr("class", "stroke-med no-fill stroke-yellow")
    .attr("d", linef);

// add markers with associated data
svgm.selectAll("use")
    .data(markers)
    .enter()
    .append("use")
        .attr("href","#pointer")
        .attr("x",      function(d) { return (d.x) })
        .attr("y",      function(d) { return (d.y) })
        .attr("fill",   function(d) { return (d.c) })
        .attr("stroke", function(d) { return (d.b) })
        .attr("class","pin");

var dragHandler = d3.drag()
    .on("drag", function(d) {
        d3.select(this)
            .attr("x", d.x = Math.max(Math.min(d3.event.x,xScale(xmax)),xScale(-xmax)))
            .attr("y", d.y = Math.min(Math.max(d3.event.y,yScale(ymax)),yScale(-ymax))); // min/max flipped for y-axis
        update_display();
    });

dragHandler(svgm.selectAll("use"));

// run initial update
update_display();

// generate power spectral density
function compute_pathloss(marker_a, marker_b)
{
    let dx = xInvScale(marker_a.x) - xInvScale(marker_b.x);
    let dy = yInvScale(marker_a.y) - yInvScale(marker_b.y);
    let d  = Math.max(dmin,Math.sqrt(dx**2 + dy**2));
    return [d, 20*Math.log10(4*Math.PI*d/lambda)];
}


function update_display(freq) {

    if(freq!=null) { fc = freq; }

    function update_freq() {

        document.querySelector('#fc').value = d3.format(".2f")((f0+fc*fs)*scale_freq) + " " + units_freq + "Hz";
        document.querySelector('#frequency').value = fc;
    }


    update_freq();

    // compute loss between appropriate nodes and update generator
    let [d0, L0] = compute_pathloss(markers[0], markers[1]);
    let [d1, L1] = compute_pathloss(markers[2], markers[1]);
    // update generator, compensating for bandwidth
    generator.clear();
    generator.add_signal(fc,    bw,    gn    -L0+10*Math.log10(bw)    ); // user signal
    generator.add_signal(fc_int,bw_int,gn_int-L1+10*Math.log10(bw_int)); // interference
    generator.generate(n0); // generate with specific noise floor
    dataf = d3.range(0,nfft-1).map(function(i) { return {"y": generator.psd[i] } })
    pathf.datum(dataf).attr("d", linef);

    // draw line between markers
    path.datum(markers).attr("d", line);

    // update ouput values
    document.querySelector('#d0').value = d3.format(".3f")(d0) + " m";
    document.querySelector('#L0').value = d3.format(".1f")(L0) + " dB";
    document.querySelector('#d1').value = d3.format(".3f")(d1) + " m";
    document.querySelector('#L1').value = d3.format(".1f")(L1) + " dB";

    // compute and display SINR
    let S     = Math.pow(10.,(gn    -L0)/10); // received signal power (linear)
    let I     = Math.pow(10.,(gn_int-L1)/10); // received interference power (linear)
    let N     = bw * Math.pow(10.,n0/10.);  // noise power (linear)


    // overlap will be the fraction of the interferer that overlaps.
    let overlap;

    let int_lower = fc_int - bw_int/2.0;
    let int_upper = fc_int + bw_int/2.0;

    let sig_lower = fc - bw/2.0;
    let sig_upper = fc + bw/2.0;

    if(int_lower > sig_upper || int_upper < sig_lower)
        overlap = 0.0;
    else {
        // they overlap at least some.
        if(int_lower < sig_lower)
            int_lower = sig_lower;
        if(int_upper > sig_upper)
            int_upper = sig_upper;
        overlap = (int_upper - int_lower)/bw;
    }


    //console.log("S = " + 10*Math.log10(S) + ", I = " + 10*Math.log10(I) + ", N = " + 10*Math.log10(N));
    let SINRdB= 10*Math.log10(S/(N+ overlap * I));
    document.querySelector('#sinr').value = d3.format(".2f")(SINRdB) + " dB";

    // compute and display capacity
    let C = fs * bw * Math.log2(1+Math.pow(10.,SINRdB/10.));
    var [scale_cap,units_cap] = scale_units(C,0.1);
    document.querySelector('#cap').value = d3.format(".1f")(C*scale_cap) + " " + units_cap + "bps";
}


// IQPlot(sig);

</script>
</html>