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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": {}
}
]
}
|
