From ce8ae723cf496b698a0f6395e43bc3b993081d5b Mon Sep 17 00:00:00 2001 From: "Matthias P. Braendli" Date: Sat, 4 Feb 2017 17:53:09 +0100 Subject: Clarify some parts of align notebook --- align/GenerateExampleTxRxIQ.ipynb | 1644 ++----------------------------------- 1 file changed, 52 insertions(+), 1592 deletions(-) diff --git a/align/GenerateExampleTxRxIQ.ipynb b/align/GenerateExampleTxRxIQ.ipynb index 8f2fe6b..9ded3ec 100644 --- a/align/GenerateExampleTxRxIQ.ipynb +++ b/align/GenerateExampleTxRxIQ.ipynb @@ -7,6 +7,34 @@ "# Generate an example RX and TX dataset, with a subsample delay and try to resolve it afterwards" ] }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Configuration" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": { + "collapsed": false + }, + "outputs": [], + "source": [ + "# whether to correct for delays larger than one sample\n", + "# Not necessary unless you have delay larger than oversample/2\n", + "do_integer_compensation = 0\n", + "\n", + "# by how much to oversample the signal before applying the delay\n", + "oversample = 16\n", + "\n", + "# Add a delay of delay/oversample samples to the input signal\n", + "delay = 7\n", + "\n", + "print(\"Expecting a delay of {} samples\".format(delay/oversample))" + ] + }, { "cell_type": "markdown", "metadata": {}, @@ -16,7 +44,7 @@ }, { "cell_type": "code", - "execution_count": 12, + "execution_count": null, "metadata": { "collapsed": false }, @@ -32,8 +60,13 @@ "iq_file = \"/home/bram/dab/aux/odr-dab-cir/phasereference.2048000.fc64.iq\"\n", "\n", "iq_data = np.fromfile(iq_file, np.complex64)\n", + "\n", + "# oversampling the input signal doesn't make much of a difference\n", "phase_ref_iq = scipy.signal.resample(iq_data, 2 * len(iq_data))\n", "\n", + "# make the signal periodic by duplicating the signal\n", + "phase_ref_iq = np.concatenate((phase_ref_iq, phase_ref_iq))\n", + "\n", "noise_iq = np.random.normal(scale = np.max(np.abs(phase_ref_iq)) * 0.02,\n", " size=len(phase_ref_iq))\n", "\n", @@ -45,10 +78,8 @@ " (np.linspace(0, 0.5, len(phase_ref_iq)/2, endpoint=False),\n", " np.linspace(-0.5, 0, len(phase_ref_iq)/2, endpoint=False)))\n", "\n", - "phase_ref_uc = scipy.signal.resample(phase_ref_iq, 4 * len(phase_ref_iq))\n", + "phase_ref_uc = scipy.signal.resample(phase_ref_iq, oversample * len(phase_ref_iq))\n", "\n", - "do_integer_compensation = 0\n", - "delay = 1\n", "\n", "phase_ref_uc_delayed = np.roll(phase_ref_uc, delay)\n", "\n", @@ -64,20 +95,12 @@ }, { "cell_type": "code", - "execution_count": 13, + "execution_count": null, "metadata": { "collapsed": false, "scrolled": false }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Integer delay corrected: 0\n" - ] - } - ], + "outputs": [], "source": [ "corr_begin_ix = -32\n", "corr_end_ix = 32\n", @@ -111,804 +134,12 @@ }, { "cell_type": "code", - "execution_count": 14, + "execution_count": null, "metadata": { "collapsed": false, "scrolled": false }, - "outputs": [ - { - "name": "stdout", - "output_type": "stream", - "text": [ - "Applying subsample correction: -0.4999999999999981\n", - "-3249.30731816 5104.0 -1.0 0.0 0.0\n" - ] - }, - { - "data": { - "application/javascript": [ - "/* Put everything inside the global mpl namespace */\n", - "window.mpl = {};\n", - "\n", - "mpl.get_websocket_type = function() {\n", - " if (typeof(WebSocket) !== 'undefined') {\n", - " return WebSocket;\n", - " } else if (typeof(MozWebSocket) !== 'undefined') {\n", - " return MozWebSocket;\n", - " } else {\n", - " alert('Your browser does not have WebSocket support.' +\n", - " 'Please try Chrome, Safari or Firefox ≥ 6. ' +\n", - " 'Firefox 4 and 5 are also supported but you ' +\n", - " 'have to enable WebSockets in about:config.');\n", - " };\n", - "}\n", - "\n", - "mpl.figure = function(figure_id, websocket, ondownload, parent_element) {\n", - " this.id = figure_id;\n", - "\n", - " this.ws = websocket;\n", - "\n", - " this.supports_binary = (this.ws.binaryType != undefined);\n", - "\n", - " if (!this.supports_binary) {\n", - " var warnings = document.getElementById(\"mpl-warnings\");\n", - " if (warnings) {\n", - " warnings.style.display = 'block';\n", - " warnings.textContent = (\n", - " \"This browser does not support binary websocket messages. \" +\n", - " \"Performance may be slow.\");\n", - " }\n", - " }\n", - "\n", - " this.imageObj = new Image();\n", - "\n", - " this.context = undefined;\n", - " this.message = undefined;\n", - " this.canvas = undefined;\n", - " this.rubberband_canvas = undefined;\n", - " this.rubberband_context = undefined;\n", - " this.format_dropdown = undefined;\n", - "\n", - " this.image_mode = 'full';\n", - "\n", - " this.root = $('
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