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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 10 Wireless digital communication"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 10.2 Page no 467"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#given\n",
+      "n=3                 #shift registers\n",
+      "n1=7\n",
+      "\n",
+      "#calculation\n",
+      "x=(2**n)-1\n",
+      "y=(2**7)-1\n",
+      "\n",
+      "#result\n",
+      "print\"(a) n =\",n,\"PN sequence length = \",x\n",
+      "print\"(b) n =\",n1,\"PN sequence length = \",y"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(a) n = 3 PN sequence length =  7\n",
+        "(b) n = 7 PN sequence length =  127\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 10.3 Page no 477"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#given\n",
+      "x=56.0                                #modulation bit rate\n",
+      "y=560                                 #chip rate\n",
+      "a=256.0                               #modulation bit rate\n",
+      "b=1792                                #chip rate\n",
+      "\n",
+      "#calculation\n",
+      "z=y/x\n",
+      "c=b/a\n",
+      "\n",
+      "#result\n",
+      "#part(a)\n",
+      "print\"Spreading of a DSSS signal = \",z\n",
+      "print\"Spreading of a DSSS signal = \",c"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Spreading of a DSSS signal =  10.0\n",
+        "Spreading of a DSSS signal =  7.0\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file