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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": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-20 16:58:48 +0000