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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:15f18d4eac7b181ba51c6696eba06fa436baa89f07a517b2b2096748a0e3b407"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 13: Interference"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.1, Page 350"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable Declaration\n",
+      "EIRP1=34     #desired carrier EIRP from satellite(dB)\n",
+      "G1=44    # ground station receiving antenna gain(dB)\n",
+      "G2=24.47 #Gain in desired direction(dB)\n",
+      "EIRP2=34  #EIRP by interfering satellite(dB)\n",
+      "PD=4      #Polarization discrimination(dB)\n",
+      "\n",
+      "#Calculation\n",
+      "\n",
+      "CIR=EIRP1-EIRP2+G1-G2+PD  #Carrier to Interference ratio(dB)\n",
+      "\n",
+      "#Result\n",
+      "\n",
+      "print \"The Carrier to interfernce ratio at the ground receiving antenna is\",CIR,\"dB\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The Carrier to interfernce ratio at the ground receiving antenna is 23.53 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.2, Page 350"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable Decalration\n",
+      "\n",
+      "PA=24   #Transmit power by station A(dBW)\n",
+      "G1=54   #Antenna Gain(dB)\n",
+      "PC=30   #Transmit power by station C(dBW)\n",
+      "G2=24.47#off-axis gain in the S1 direction(dB)\n",
+      "PD=4      #Polarization discrimination(dB)\n",
+      "\n",
+      "#Calculation\n",
+      "\n",
+      "CIR=PA-PC+G1-G2+PD   #Carrier to Interference ratio(dB)\n",
+      "\n",
+      "#Result\n",
+      "\n",
+      "print \"The Carrier to interfernce ratio on uplink is\",CIR,\"dB\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The Carrier to interfernce ratio on uplink is 27.53 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.3, Page 351"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Variable Declaration\n",
+      "\n",
+      "CIR1=27.53   #Carrier to interference ratio from Example 13.1(dB)\n",
+      "CIR2=23.53   #Carrier to interference ratio from Example 13.2(dB)\n",
+      "\n",
+      "#Calculation\n",
+      "\n",
+      "ICRu=10**(-CIR1/10)  #Interferece to carrier ratio for uplink\n",
+      "ICRd=10**(-CIR2/10)  #Interferece to carrier ratio for downlink\n",
+      "\n",
+      "ICRant=ICRu+ICRd   #Overall Interferece to carrier ratio\n",
+      "CIRant=-10*math.log10(ICRant)#Overall Carrier to interference ratio (dB)\n",
+      "CIRant=round(CIRant,2)\n",
+      "#Result\n",
+      "\n",
+      "print \"The overall carrier to interference ratio is\",CIRant,\"dB\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The overall carrier to interference ratio is 22.07 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.4, Page 352"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Variable Declaration\n",
+      "\n",
+      "SSi=4 #Initial satellite spacing(degrees)\n",
+      "SSl=2 #Later Satellite spacing(degrees)\n",
+      "\n",
+      "#Calculation\n",
+      "\n",
+      "IIR=(29-25*math.log10(SSl))-(29-25*math.log10(SSi))  #Increase in Interference(dB)\n",
+      "IIR=round(IIR,1)\n",
+      "#Result\n",
+      "\n",
+      "print \"The degradation in downlink C/I is\",IIR,\"dB\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The degradation in downlink C/I is 7.5 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.5, Page 356"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable Declaration\n",
+      "\n",
+      "f=4.2  #modualating frequency(MHz)\n",
+      "m=2.571 #Modulation index\n",
+      "QIF1=4.2   #Quality Impairment factor(a)\n",
+      "QIF2=4.5  #Quality Impairment factor(b)\n",
+      "\n",
+      "#Calculation\n",
+      "\n",
+      "Dv=2*m*f  #Peak to peak deviation(MHz)\n",
+      "\n",
+      "PR1=12.5-20*math.log10(Dv/12)-QIF1+1.1*QIF1**2 #Protection ratio for case(a)\n",
+      "PR1=round(PR1,1)\n",
+      "PR2=12.5-20*math.log10(Dv/12)-QIF2+1.1*QIF2**2 #Protection ratio for case(b)\n",
+      "PR2=round(PR2,1)\n",
+      "#Results\n",
+      "\n",
+      "print \"The protection ratio for quality impairment factor of 4.2 is\",PR1,\"dB\"\n",
+      "\n",
+      "print \"The protection ratio for quality impairment factor of 4.5 is\",PR2,\"dB\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The protection ratio for quality impairment factor of 4.2 is 22.6 dB\n",
+        "The protection ratio for quality impairment factor of 4.5 is 25.2 dB\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.6, Page 363"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable Decalration\n",
+      "LU=200   #Uplink propogation loss(dB)\n",
+      "LD=196   #Downlink propogation loss(dB)\n",
+      "GE=25    #Receiving gain of earth station(dB)\n",
+      "GE1=25   #Transmit gain of E1 in the direction of S(dB)\n",
+      "GS=9     #receive gain of S in the direction of E1(dB)\n",
+      "GS1=9   #Transmit gain of satellite S1 in the direction of E(dB)\n",
+      "GTE=48  #Transmit gain of E(dB)\n",
+      "GRE=48  #Receive gain of E(dB)\n",
+      "GRS=19  #Receive gain of S(dB)\n",
+      "GTS=19  #Transmit gain of S(dB)\n",
+      "US=-60    #Maximum power spectral density(dBJ)\n",
+      "US1=1   #Maximum power spectral density(uJ)\n",
+      "UE1=10  #Maximum power spectral density transmitted by earth station(uJ)\n",
+      "UE=-50  #Maximum power spectral density transmitted by earth station(dBJ)\n",
+      "k=-228.6\n",
+      "#Calculation\n",
+      "\n",
+      "URS=UE+GTE+GRS-LU#Received power spectral density at satellite S(dB)\n",
+      "URE=US+GTS+GRE-LD#Received power spectral density at satellite E(dB)\n",
+      "y=URE-URS    #Transmission gain for network R(dB)\n",
+      "\n",
+      "I1=US+GS1+GE-LD  #Interference received by earth station(dB)\n",
+      "I2=UE+GE1+GS-LU  #Uplink Interference(dB)\n",
+      "\n",
+      "delTE=I1-k   #Earth station receiver input(dBK)\n",
+      "delTE=10**(delTE/float(10))  #Earth station receiver input(K)\n",
+      "delTS=I2-k   #Noise temperature at satellite receiver input(dBK)\n",
+      "\n",
+      "delTSE=y+delTS  #Noise Temperature rise(dBKelvin)\n",
+      "delTSE=10**(delTSE/10)  #Noise Temperature rise(Kelvin)\n",
+      "delT=delTSE+delTE  #Equivalent noise temperature rise\n",
+      "delT=round(delT,2)\n",
+      "\n",
+      "print URE,URS\n",
+      "#Results\n",
+      "\n",
+      "print \"The transmission gain is\",y,\"dB\"\n",
+      "print \"The interference levels I1 an I2 are\",I1,I2,\"dBJ respectively\"\n",
+      "print \"The equivalent temperature rise overall is\",delT,\"Kelvin\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "-189 -183\n",
+        "The transmission gain is -6 dB\n",
+        "The interference levels I1 an I2 are -222 -216 dBJ respectively\n",
+        "The equivalent temperature rise overall is 9.14 Kelvin\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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