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+{
+"cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# Chapter 10: Wireless Communication Systems"
+ ]
+ },
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.11: power_level_in_TDMA.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"P4dBW=-34\n",
+"PdBm4=P4dBW-30\n",
+"PW4=10^((PdBm4/10))\n",
+"disp(PW4,'minimum power level of class IV phone in mW')\n",
+"ERP1dBW=6\n",
+"PdBm1=ERP1dBW-30\n",
+"PW1=10^((PdBm1/10))\n",
+"disp(PW1,'ERP of class I phone in mW')\n",
+"R=PW1/PW4\n",
+"RdB=10*log10(R)\n",
+"mprintf('minimum power level for a class I phone is greater than\n minimum power level of class IV phone by factor of %idB or %f',RdB,R)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.12: transmission_data_rate.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"spfl=810*10^6\n",
+"spfu=826*10^6\n",
+"sprl=940*10^6\n",
+"spru=956*10^6\n",
+"BWf=spfu-spfl\n",
+"BWr=spru-sprl\n",
+"BWc=10/100*BWf//BWf=BWr(universal standard)\n",
+"BWv=BWf-BWc\n",
+"nsc=1150\n",
+"BWmax=BWv/nsc\n",
+"SPef=1.68\n",
+"CDRmax=BWmax*SPef\n",
+"FECcr=0.5\n",
+"DRnmax=FECcr*CDRmax\n",
+"disp(DRnmax,'there is a speech coder with a max. data rate of in bps')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.13: TDMA_voice_frame.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"d=40*10^-3\n",
+"npf=6\n",
+"dts=d/npf//duration of a time slot of a voice frame\n",
+"nbv=1944\n",
+"nbpts=nbv/npf//no. of bits per time slot\n",
+"db=d/nbv//duration of a bit in secs\n",
+"npg=6\n",
+"tg=db*npg//guard time in secs\n",
+"c=3*10^8\n",
+"Disrt=c*tg\n",
+"Dismx=Disrt/2//max. distance\n",
+"disp(dts,'duration of a time slot of a voice frame in secs')\n",
+"disp(nbpts,'no. of bits per time slot')\n",
+"disp(db,'duration of a bit in secs')\n",
+"disp(tg,'guard time in secs')\n",
+"disp(Dismx,'maximum distance between a cell site and a mobile in metre')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.14: gross_bit_rate_of_TDMA_voice_frame.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"dv=40*10^-3\n",
+"nps=1/dv\n",
+"nbpv=1944\n",
+"TGrbr=nbpv*25\n",
+"TGrbaur=TGrbr/2//2 bits/symbol for pi/4 qpsk mod\n",
+"CBW=30*10^3\n",
+"BWef=TGrbr/CBW\n",
+"disp(TGrbr,'total gross bit rate for the RF signal in bps')\n",
+"disp(TGrbaur,'total gross baud rate for the RF signal in bps')\n",
+"disp(BWef,'bandwidth efficiency in bps/Hz')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.15: comparison_of_capacity.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"Bt=12.5*10^6\n",
+"Bc=30*10^3\n",
+"K=7//frequency reuse factor\n",
+"N=Bt/Bc//total no. of available channels\n",
+"M=N*(1/K)//user capacity per cell \n",
+"Nu=3//no. of users/channel\n",
+"NU=N*Nu\n",
+"K1=4\n",
+"M1=NU*(1/K1)\n",
+"disp(M,'capacity of 1G AMPS FDMA analog cellular system in users/cell')\n",
+"disp(M1,'capacity of 2G IS-136 TDMA digital cellular system in users/cell')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.1: spectral_efficiency.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"BW=12.5*10^3\n",
+"TDR1=512//transmission data rate\n",
+"SPef1=TDR1/BW//spectral efficiency\n",
+"TDR2=1200\n",
+"SPef2=TDR2/BW\n",
+"TDR3=2400\n",
+"SPef3=TDR3/BW\n",
+"disp(SPef1,'the spectral efficiency in bps/Hz at 512 bps transmission data rate')\n",
+"disp(SPef2,'the spectral efficiency in bps/Hz at 1200 bps transmission data rate')\n",
+"disp(SPef3,'the spectral efficiency in bps/Hz at 2400 bps transmission data rate')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.2: number_of_pages.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"TDR=1200\n",
+"T=60\n",
+"TN=TDR*T//total no. of bits in 60 sec\n",
+"NP=576//no. of bits in the preamble\n",
+"NU=TN-NP//no. of usable bits\n",
+"NS=32\n",
+"NA=32\n",
+"N16=16*NA\n",
+"N1B=NS+N16\n",
+"NBPM=NU/N1B//no. of batches/min.\n",
+"NPAPB=16\n",
+"NTPM=NBPM*NPAPB//no. of pages transmitted/min.\n",
+"disp(NTPM,'no. of pages transmitted/min.')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.3: increase_in_capacity.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"BW=25*10^3//bandwidth of POCSAG=bandwidth of FLEX system\n",
+"TDR1=1200// transmission data rate\n",
+"SPef1=TDR1/BW//spectral efficiency\n",
+"TDR2=6400\n",
+"SPef2=TDR2/BW\n",
+"disp(SPef1,'the spectral efficiency in bps/Hz at 1200 bps transmission data rate in POCSAG paging system')\n",
+"disp(SPef2,'the spectral efficiency in bps/Hz at 6400 bps transmission data rate in FLEX paging system')\n",
+"Cinc=TDR2/TDR1\n",
+"disp(Cinc,'estimating increase in capacity in times')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.6: number_of_channels_in_US_AMPS.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"Bt=12.5*10^6\n",
+"Bg=10*10^3\n",
+"B2g=2*Bg//Guard band on both the ends\n",
+"ABW=Bt-B2g\n",
+"Bc=30000//channel bandwidth\n",
+"N=ABW/Bc\n",
+"disp(N,'total no. of channels available in the system')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 10.8: AMPS_communication_range.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"ERPmax1dB=6\n",
+"ERPmax2dB=-2\n",
+"DiffdB=ERPmax1dB-ERPmax2dB\n",
+"Diff=10^(DiffdB/10)\n",
+"Rfree=5*(Diff)^(1/2)//free space-case(a)\n",
+"Rtypc=5*(Diff)^(1/4)//signal attenuation is proportional to 4th power-case(b)\n",
+"disp(Rfree,'maximum communication range in km in a free space propogation condition-case(a)')\n",
+"disp(Rtypc,'maximum communication range in km when signal attenuation is proportional to 4th power-case(b)')"
+ ]
+ }
+],
+"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
+}
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