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diff --git a/Satellite_Communication_by_Anil_K.maini_Varsha_Agrawal/chapter_5.ipynb b/Satellite_Communication_by_Anil_K.maini_Varsha_Agrawal/chapter_5.ipynb new file mode 100755 index 00000000..130c2bfd --- /dev/null +++ b/Satellite_Communication_by_Anil_K.maini_Varsha_Agrawal/chapter_5.ipynb @@ -0,0 +1,604 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:0567df6d143de5413d3406fc62e3bde7360c6adec18cda1ddb49a1255bcf929f" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "chapter 5: Communication Techniques" + ] + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.1, page no-174 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "import math\n", + "\n", + "\n", + "\n", + "\n", + "#Variable Declaration\n", + "m=0.5 #modulation index\n", + "\n", + "#Calculation\n", + "#for AM\n", + "pt1=(1+(m**2)/2.0)\n", + "#for SSBSC\n", + "pt2=(m**2)/4.0\n", + "#% power saving\n", + "p=(pt1-pt2)*100/pt1\n", + "p=math.floor(p*10)/10\n", + "\n", + "#Result\n", + "print(\"Percentage power saving is %.1f%%\"%p)\n", + "\n", + "#for case (b)\n", + "\n", + "#Variable Declaration\n", + "m=1 #modulation index\n", + "\n", + "#Calculation\n", + "#for AM\n", + "pt1=(1+(m**2)/2.0)\n", + "#for SSBSC\n", + "pt2=(m**2)/4.0\n", + "#% power saving\n", + "p=(pt1-pt2)*100/pt1\n", + "p=math.floor(p*10)/10\n", + "\n", + "#Result\n", + "print(\"\\n Percentage power saving is %.1f%%\"%p)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Percentage power saving is 94.4%\n", + "\n", + " Percentage power saving is 83.3%\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.2, page no-174 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#Variable Declaration\n", + "pc=500 #energy of carrier signal\n", + "m=0.6 #AM modulation index\n", + "\n", + "\n", + "#Calculation\n", + "\n", + "#for (a)\n", + "pt=pc*(1+(m**2)/2)\n", + "\n", + "#for (b)\n", + "pt2=pc*(m**2)/4\n", + "\n", + "\n", + "#Result\n", + "print(\"(a)\\n A3E is the double side band AM with full carrier.\\n Therefore, Pt= %.0f W\\n\\n (b)\\n J3E is an SSBSC system.\\n Therefore, Pt= %.0f W\"%(pt,pt2))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "(a)\n", + " A3E is the double side band AM with full carrier.\n", + " Therefore, Pt= 590 W\n", + "\n", + " (b)\n", + " J3E is an SSBSC system.\n", + " Therefore, Pt= 45 W\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.3, page no-175 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#Variable Declaration\n", + "m=0.6 #60% modulation\n", + "\n", + "\n", + "#Calculation\n", + "#for A3E\n", + "pt1=(1+(m**2)/2)\n", + "#for J3E\n", + "pt2=(m**2)/4\n", + "#% power saving\n", + "p=(pt1-pt2)*100/pt1\n", + "p=math.ceil(p*10)/10\n", + "\n", + "#Result\n", + "print(\"Percentage power saving is %.2f%%\"%p)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Percentage power saving is 92.40%\n" + ] + } + ], + "prompt_number": 5 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.4, page no-175 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#Variable Declaration\n", + "\n", + "bw=0.5/100 #bw is 0.5% of carrier freq. \n", + "\n", + "\n", + "#Calculation\n", + "wc=2/bw\n", + "\n", + "#Result\n", + "print(\"Wc = %.0f*Wm\"%wc)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Wc = 400*Wm\n" + ] + } + ], + "prompt_number": 6 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.5, page no-190 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Variable Declaration\n", + "\n", + "m=6.0 #Modulation Index\n", + "wc=7.8*10**8 #unmodulated carrier frequency\n", + "wm=1450 #Modulating frequency\n", + "\n", + "\n", + "#Calculation\n", + "fc=wc/(2*math.pi)\n", + "fm=wm/(2*math.pi)\n", + "\n", + "\n", + "#Result\n", + "print(\"Unmodulated carrier frequency, fc = %.2f MHz \\n The modulation index m = %d \\n Modulating frequency, fm = %.2f Hz\"%(fc/10**6,m,fm))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Unmodulated carrier frequency, fc = 124.14 MHz \n", + " The modulation index m = 6 \n", + " Modulating frequency, fm = 230.77 Hz\n" + ] + } + ], + "prompt_number": 8 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.7, page no-191 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "mf=150 #modulation index\n", + "fm=1 # modulating frequency in KHz\n", + "\n", + "\n", + "#Calculation\n", + "fd=mf*fm\n", + "bw=2*(mf+1)*fm\n", + "\n", + "#Result\n", + "print(\"frequency deviation = %.0f kHz\\n Bandwidth = %.0f kHz \\n\\n Expression for instantaneous frequency is given by, \\n f = 10^8-150*(10^3)*sin(2*3.14*10^3*t)\"%(fd,bw))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "frequency deviation = 150 kHz\n", + " Bandwidth = 302 kHz \n", + "\n", + " Expression for instantaneous frequency is given by, \n", + " f = 10^8-150*(10^3)*sin(2*3.14*10^3*t)\n" + ] + } + ], + "prompt_number": 10 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.8, page no-191 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#Variable Declaration\n", + "fd=50 #frequency deviation in kHz\n", + "fm=1.0 #modulating frequency in kHz for case 1\n", + "fm2=100.0 #modulating frequency in kHz for case 2\n", + "\n", + "\n", + "#Calculation\n", + "#for case 1\n", + "m=fd/fm\n", + "bw=2*(m+1)*fm\n", + "#for case 2\n", + "m2=fd/fm2\n", + "bw2=2*(m2+1)*fm2\n", + "\n", + "\n", + "#Result\n", + "print(\"For first case\\n Modulation index = %.0f \\n Bandwidth = %.0f kHz \\n\\n For second case\\n Modulation index = %.1f \\n Bandwidth = %.0f kHz\"%(m,bw,m2,bw2))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [] + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.9, page no-192 " + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#Variable Declaration\n", + "bw=20*10**3 #bandwidth in Hz\n", + "fm=1* 10**3 #modulating frequency in Hz\n", + "\n", + "\n", + "#Calculation\n", + "mf=(bw/(2*fm))-1\n", + "new_mf=mf*6\n", + "new_fm=0.5 #kHz\n", + "new_bw=2*(new_mf+1)*new_fm\n", + "\n", + "#Result\n", + "print(\"mf=%.0f\\n New modulation index = %.0f\\n New bandwidth = %.0f kHz\"%(mf,new_mf,new_bw))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "mf=9\n", + " New modulation index = 54\n", + " New bandwidth = 55 kHz\n" + ] + } + ], + "prompt_number": 11 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.10, page no-192" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "#Variable Declaration\n", + "fd=75.0 #Maximum allowed frequency deviation in kHz\n", + "fm=15.0 #Highest modulating frequency in kHz\n", + "\n", + "\n", + "#Calculation\n", + "D=fd/fm\n", + "bw=2*(D+1)*fm\n", + "\n", + "#Result\n", + "print(\"Deviation Ratio, D = %.0f\\n Bandwidth = %.0f kHz\"%(D,bw))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Deviation Ratio, D = 5\n", + " Bandwidth = 180 kHz\n" + ] + } + ], + "prompt_number": 13 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.11, page no-199" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "#Variable Declaration\n", + "fm=3200.0 #highest frequency component in message signal\n", + "k=48000.0 #channel capacity in b/s\n", + "\n", + "#Calculation\n", + "fs=2*fm\n", + "n=k/fs\n", + "n=math.floor(n)\n", + "\n", + "#Result\n", + "print(\"n = %.0f\\n L = 2^7 = %.0f\\n fs = %.3f kHz\"%(n,2**7,(k/7)/1000))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "n = 7\n", + " L = 2^7 = 128\n", + " fs = 6.857 kHz\n" + ] + } + ], + "prompt_number": 15 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.12, page no-199" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\n", + "f=2500 #Highest frequency component in the signal in Hz\n", + "\n", + "#result\n", + "print(\"Nyquist rate = 2 x f\\n\\t = %.0f Hz = %.0f kHz\"%(2*f,2*f/1000))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Nyquist rate = 2 x f\n", + "\t = 5000 Hz = 5 kHz\n" + ] + } + ], + "prompt_number": 16 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.13, page no-199" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "#Variable Declaration\n", + "l=128 #no of Quantizing levels\n", + "fs=10000.0 #sampling frequency in Hz\n", + "\n", + "\n", + "#Calculation\n", + "n=7 #math.log2(l)\n", + "t=1/(n*fs)\n", + "\n", + "#Result\n", + "print(\"Number of bits per sample (n) = %.0f\\n Time duration of one bit of binary encoded signal is %.3f micro second\"%(n,t*10**6))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Number of bits per sample (n) = 7\n", + " Time duration of one bit of binary encoded signal is 14.286 micro second\n" + ] + } + ], + "prompt_number": 17 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.15, page no-208" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "f1=2.4 #first signal frequency\n", + "f2=3.2 #2nd signal frequency\n", + "f3=3.4 #3rd signal frequency\n", + "\n", + "t\n", + "\n", + "\n", + "sr=3*(f3*2)\n", + "st=10**6/(sr*10**3)\n", + "print(\"Sampling rate of the composite signal = %.1f kHz \\nSampling interval of the composite signal = %.0f micro second\"%(sr,st))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Sampling rate of the composite signal = 20.4 kHz \n", + "Sampling interval of the composite signal = 49 micro second\n" + ] + } + ], + "prompt_number": 19 + }, + { + "cell_type": "heading", + "level": 3, + "metadata": {}, + "source": [ + "Example 5.16, page no-209" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math\n", + "\n", + "bw=3.2 # voice channel band limited frequency in kHz\n", + "r=1.2 # 1.2 times the Nyquist rate\n", + "n=24.0 # no of voice channel\n", + "b=8.0 # 8-bit PCM\n", + "sr=2*bw*r\n", + "p=10**6/(sr*10**3)\n", + "N=(n*b)+1\n", + "bit_d=p/N\n", + "bit_d=math.ceil(bit_d*1000)/1000\n", + "tr=1/bit_d\n", + "\n", + "print(\"Number of bits in each frame = %.0f \\nBit duration = %.3f micro second \\nTransmission rate = %.3f Mbps\"%(N,bit_d,math.ceil(tr*1000)/1000))\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Number of bits in each frame = 193 \n", + "Bit duration = 0.675 micro second \n", + "Transmission rate = 1.482 Mbps\n" + ] + } + ], + "prompt_number": 21 + } + ], + "metadata": {} + } + ] +}
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