WIP DSSS decoding

1 files changed, 14 insertions, 10 deletions

diff --git a/lab-windows/dsss_experiments-ber.ipynb b/lab-windows/dsss_experiments-ber.ipynb
index 83a4a17..5d0de5f 100644
--- a/lab-windows/dsss_experiments-ber.ipynb
+++ b/lab-windows/dsss_experiments-ber.ipynb
@@ -73,11 +73,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [],
    "source": [
-    "def modulate(data, nbits=5):\n",
+    "def modulate(data, nbits=5, pad=True):\n",
     "    # 0, 1 -> -1, 1\n",
     "    mask = np.array(gold(nbits))*2 - 1\n",
     "    \n",
@@ -85,7 +85,10 @@
     "    data_lsb_centered = ((data&1)*2 - 1)\n",
     "\n",
     "    signal = (np.multiply(sel, np.tile(data_lsb_centered, (2**nbits-1, 1)).T).flatten() + 1) // 2\n",
-    "    return np.hstack([ np.zeros(len(mask)), signal, np.zeros(len(mask)) ])"
+    "    if pad:\n",
+    "        return np.hstack([ np.zeros(len(mask)), signal, np.zeros(len(mask)) ])\n",
+    "    else:\n",
+    "        return signal"
    ]
   },
   {
@@ -124,7 +127,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 21,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -139,18 +142,19 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 73,
+   "execution_count": 26,
    "metadata": {},
    "outputs": [],
    "source": [
-    "test_duration = 300\n",
+    "test_duration = 200\n",
     "test_nbits = 5\n",
     "test_signal_amplitude=2.0e-3\n",
     "test_decimation=10\n",
     "\n",
     "for test_signal_amplitude in [2.0e-3, 20e-3, 200e-3, 2]:\n",
     "    test_data = np.random.RandomState(seed=0).randint(0, 2 * (2**test_nbits), test_duration)\n",
-    "    signal = np.repeat(modulate(test_data, test_nbits) * 2.0 - 1, test_decimation) * test_signal_amplitude\n",
+    "    #test_data = np.array([0, 1, 2, 3] * 50)\n",
+    "    signal = np.repeat(modulate(test_data, test_nbits, pad=False) * 2.0 - 1, test_decimation) * test_signal_amplitude\n",
     "    with open(f'dsss_test_signals/dsss_test_noiseless_{test_signal_amplitude*1000:.0f}mHz.bin', 'wb') as f:\n",
     "        for e in signal:\n",
     "            f.write(struct.pack('<f', e))"
@@ -1174,9 +1178,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "labenv",
+   "display_name": "winlabenv",
    "language": "python",
-   "name": "labenv"
+   "name": "winlabenv"
   },
   "language_info": {
    "codemirror_mode": {
@@ -1188,7 +1192,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.1"
+   "version": "3.7.6"
   }
  },
  "nbformat": 4,