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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 8: Multiple Access Techniques"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.11: throughput_of_pure_ALOHA.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"TDR=1*10^6\n",
+"G=0.5\n",
+"SmaxALOHA=G*%e^(-2*G)*TDR// throughput\n",
+"printf('\nmax. throughput of ALOHA with large no.of subscibers with transmission rate of 1Mbps is= %.f kbps',SmaxALOHA*10^(-3))\n",
+"Stdma=100/100*TDR\n",
+"printf('\nthroughput of a TDMA network with transmission rate of 1Mbps is= %.f Mbps',Stdma*10^(-6));\n",
+"Saloha=TDR\n",
+"printf('\nthroughput of ALOHA with 1 subsciber with transmission rate of 1Mbps= %.f Mbps',Saloha*10^(-6));"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.1: impact_of_aci_in_fdma.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"Y=2//prpogation path-loss exponent\n",
+"r2=10^3\n",
+"r1=10\n",
+"delPr=20*log10(r2/r1)^2//log(r2/r1)*20dB/decade\n",
+"disp(delPr,'difference between the recieved signal strength (in dB)')\n",
+"imp=delPr+20//impact\n",
+"disp(imp,'effect of shadow fading causes difference between the recieved signal strength to exceed to (in dB)')\n",
+"outrad=40//out of bound radiations\n",
+"disp(imp-outrad,'IMPACT is out-of-bound radiations exceeds the desired signal strength by (in dB)')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.3: number_of_channels_in_AMPS.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"Bt=12.5*10^6\n",
+"Bg=10^3\n",
+"Bc=30*10^3\n",
+"N=(Bt-2*Bg)/Bc//no. of channels\n",
+"disp(N,'no. of channels available in an FDMA system is' )"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.4: number_of_channel_links.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"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",
+"disp(nd,'Number of simultaneous calls')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.5: number_of_simultaneous_users.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"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",
+"disp(N,'no. of simultaneous subscribers a GSM system can accommodate is ' )"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.7: frame_efficiency_of_GSM.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"N=156.25//total bits\n",
+"nov=40.25//overhead bits\n",
+"FReff=(1-nov/N)*100//frame efficiency\n",
+"disp(FReff,'the frame efficiency (in %)')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}