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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
}
|
