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+{

+ "metadata": {

+  "name": "",

+  "signature": "sha256:b380d0b5ef5988f7e443e226b65a3140dbdac6a491db60a3303ae9eccfb37838"

+ },

+ "nbformat": 3,

+ "nbformat_minor": 0,

+ "worksheets": [

+  {

+   "cells": [

+    {

+     "cell_type": "heading",

+     "level": 1,

+     "metadata": {},

+     "source": [

+      "CHAPTER 8 - Multiple Access Techniques"

+     ]

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "EXAMPLE 8.1 - PG NO.253"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#page no. 253\n",

+      "import math\n",

+      "Y=2.#prpogation path-loss exponent\n",

+      "r2=10.**3.\n",

+      "r1=10.\n",

+      "delPr=20.*math.log10(r2/r1)**2.#log(r2/r1)*20dB/decade\n",

+      "print '%s %d %s' %('difference between the recieved signal strength is =',delPr,'dB')\n",

+      "imp=delPr+20#impact\n",

+      "print '%s %d %s' %('effect of shadow fading causes difference between the recieved signal strength to exceed to',imp,'dB')\n",

+      "outrad=40#out of bound radiations\n",

+      "print '%s %d %s' %('IMPACT is out-of-bound radiations exceeds the desired signal strength by',imp-outrad,'dB')\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "difference between the recieved signal strength is = 80 dB\n",

+        "effect of shadow fading causes difference between the recieved signal strength to exceed to 100 dB\n",

+        "IMPACT is out-of-bound radiations exceeds the desired signal strength by 60 dB\n"

+       ]

+      }

+     ],

+     "prompt_number": 1

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "EXAMPLE 8.3 - PG NO.255"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#page no.255\n",

+      "Bt=12.5*10.**6.\n",

+      "Bg=10.**3.\n",

+      "Bc=30.*10.**3.\n",

+      "N=(Bt-2.*Bg)/Bc#no. of channels\n",

+      "print'%s %d %s' %('no. of channels available in an FDMA system is',N,'channels')\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "no. of channels available in an FDMA system is 416 channels\n"

+       ]

+      }

+     ],

+     "prompt_number": 2

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "EXAMPLE 8.4 - PG NO.256"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#page no. 256\n",

+      "TS=5.*10.**6.#total spectrum\n",

+      "CBW=25000.#bandwidth (channel)\n",

+      "ns=TS/CBW\n",

+      "nspd=2.\n",

+      "nd=ns/nspd#Number of simultaneous calls\n",

+      "print'%s %d %s' %('Number of simultaneous calls=',nd,'calls')\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "Number of simultaneous calls= 100 calls\n"

+       ]

+      }

+     ],

+     "prompt_number": 3

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "EXAMPLE 8.5 - PG NO.259"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#page no. 259\n",

+      "Bt=25.*10.**6.#allocated spectrum\n",

+      "Bc=200.*10.**3.#channel bandwidth\n",

+      "Bg=0.#no guard band\n",

+      "m=8.#no. of speech channels\n",

+      "N=m*(Bt-2.*Bg)/Bc\n",

+      "print'%s %d' %('no. of simultaneous subscribers a GSM system can accommodate is =',N )\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "no. of simultaneous subscribers a GSM system can accommodate is = 1000\n"

+       ]

+      }

+     ],

+     "prompt_number": 4

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "EXAMPLE 8.7 - PG NO.263"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#page no. 263\n",

+      "N=156.25#total bits\n",

+      "nov=40.25#overhead bits\n",

+      "FReff=(1.-nov/N)*100.#frame efficiency\n",

+      "print'%s %.1f %s' %('the frame efficiency is',FReff,'%')\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "the frame efficiency is 74.2 %\n"

+       ]

+      }

+     ],

+     "prompt_number": 5

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "EXAMPLE 8.11 - PG NO.285"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#page no. 285\n",

+      "import math\n",

+      "TDR=1.*10.**6.\n",

+      "G=0.5\n",

+      "SmaxALOHA=G*math.e**(-2.*G)*TDR# throughput\n",

+      "print'%s %d %s' %('max. throughput of ALOHA with large no.of subscibers with transmission rate of 1Mbps is =',round(SmaxALOHA*10**(-3)),'kbps')\n",

+      "\n",

+      "Stdma=100/100*TDR\n",

+      "print'%s %.f %s' %('throughput of a TDMA network with transmission rate of 1Mbps is =',Stdma*10**(-6),'Mbps')\n",

+      "\n",

+      "Saloha=TDR\n",

+      "print'%s %.f %s' %('throughput of ALOHA with 1 subsciber with transmission rate of 1Mbps =',Saloha*10**(-6),'Mbps')\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "max. throughput of ALOHA with large no.of subscibers with transmission rate of 1Mbps is = 184 kbps\n",

+        "throughput of a TDMA network with transmission rate of 1Mbps is = 1 Mbps\n",

+        "throughput of ALOHA with 1 subsciber with transmission rate of 1Mbps = 1 Mbps\n"

+       ]

+      }

+     ],

+     "prompt_number": 6

+    }

+   ],

+   "metadata": {}

+  }

+ ]

+}
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