UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS (Universidad del Perú, DECANA DE AMERICA)
FACULTAD DE INIENERIA ELECTRONICA Y ELETRICA E!A!P DE TELECOMUNICACIONES
Planificación de Radio I Comunicaciones móviles
Curso:
Laboratorio de Comunicaciones Móviles
Estudiante: Luque Quispe Jenny Mirella Código:
11190067
Ciclo:
201!"
Profesor:
M#$ %ilbert C&'ve( "ra(abal
2 de )etiembre del 201
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Pra"#i"a $ % Plani&"a"i'n de Radi "$
"*+"C, i$ ii$ iii$ iii$ iv$ iv$ v$ vi$ ""$
"ntroducción C'lcul C'lculo o de cob cobert ertura ura en en entor entorno no rural rural Me-ora Me-ora de la la cobe cobertu rtura ra Cobertura Cobertura en entorno entorno urbano urbano Cober Cobertur tura a en sent sentido ido ascen ascenden dente te ,.ecto ,.ecto del del dia#ra dia#rama ma de de radia radiación ción
"*/+CC"*
,l ob-eto de esta pr'ctica es aprender el mane-o de una &erramienta de plani.icación radio3 y apli aplica carr conc concep epto tos s b'si b'sico cos s sobr sobre e cobe cobert rtur ura a y plan plani. i.ic icac ació ión n en un sist sistem ema a de comunicaciones comunicaciones móviles$ )e utili(ar' para ello el pro#rama 4irio!nLine$ 4irio!nLine$ 5 lo lar#o de la pr'ctica se plantean pre#untas relacionadas relacionadas con el traba-o reali(ado$ ,stas pre#untas se indican mediante el ep#ra.e ,8*/5$ +eber' entre#arse una pequea memori memoria a que que conten conten#a #a las respu respuest estas as a dic&a dic&as s pre#un pre#untas tas33 as como como cualq cualquie uierr otro otro comentario que se considere relevante$ or .avor3 al elaborar la memoria de esta pr'ctica y de las si#uientes #uese por las si#uientes dos m':imas del re.ranero castellano; < <
Lo buen bueno3 o3 si brev breve3 e3 dos dos vec veces es buen bueno$ o$ =ale m's una ima# ima#en en que mil mil pala palabr bras as >siemp >siempre re que lo consi conside dere re nece necesa sari rio o incl incluy uya a #r'.icos3 pantalla(os3 dia#ramas? que ayuden a comprender sus e:plicaciones@ =aya aya a la p'#in p'#ina a o.icia o.iciall de 4irio 4irio!n !nLin Line e >&ttps >&ttps;AAB ;AABBB BB$: $:iri irio!o o!onli nline$ ne$com comA@ A@ y pulse pulse sobre sobre lannin#/ool$ Cree un usuario nuevo con los datos que se le piden >esta ser' su cuenta de usuario para las dos primeras pr'cticas as que #uarde su nombre y contrasea@$
"$
C5LCL +, C,/5 ,* ,*/* 5L ,n este apartado se reali(a un estudio de cobertura de una &ipotDtica estación base situada en entorno rural$ 5cceda a la &erramienta de plani.icación plani.icación utili(ando el usuario y contrasea que acaba de crear$ Cree un nuevo estudio pulsando sobre el botón correspondiente de la barra superior del pro#rama$ +e.ina el nuevo estudio de cobertura de la si#uiente manera;
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$
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Cate#ora; servicio móvil$ )ubcate#ora; 8)M!900$ )ervicio !8)M!900 móvil$ 5 continuación nombre el estudio como crea conveniente conveniente y aada una descripción que lo di.erencie de otros estudios .uturos$
*/5; de este momento en adelante recuerde que puede volver en cualquier momento a modi.icar las caractersticas del estudio >nombre3 transmisor3 mDtodo de c'lculo?@ sin m's que que abri abrirl rlo o util utili( i(an ando do el menE menE #ene #enera rall de la &err &erram amie ient nta3 a3 pinc pinc&a &and ndo o sobr sobre e Dl para para seleccionarlo >que quede marcado en a(ul@ y pulsando a continuación sobre la opción con.i#urar estudio dentro del menE acciones situado en la parte i(quierda de la ventana principal de la &erramienta$ &erramienta$ ,n el estudio de cobertura que &a creado3 dentro de la pestaa equipos y en el apartado sector pulse el botón verde con un F para crear una estación base$ Cree un nuevo sector con valores por de.ecto$ 5 continuación de.ina los si#uientes par'metros para la estación base3 que actEa como transmisora; Previamente se buscó en Google Earth información acerca de la zona, Magdalena, y se ubicó una zona alta cerca de la Plaza !"ac #maru, $zona %ue me fue asignada "or el "rofesor "ara el "resente informe&
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Coordenadas; 4; GH7600mI ; K67G00m >sistema de coordenadas /M %8)HK@$ ara convertir estas coordenadas a latitud y lon#itud pulse sobre el botón con .orma de calculadora3 seleccione la opción /M >%8)HK@3 introdu(ca las coordenadas y pulse sobre o
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Conve Converti rtirr de /M a #eo#r' #eo#r'.ic .icas as$$ 5 contin continuac uación ión pulse pulse sobre sobre acepta aceptar r de-ando el resto de par'metros por de.ecto$
5ntena; dipolo en NO2 >&al.!Bave dipole@$ ,n un sistema real se utili(ar'n antenas m's directivasI sin embar#o3 por simplicidad se va a utili(ar esta antena3 que es omnidire omnidireccio ccional nal en el plano plano &ori(ont &ori(ontal$ al$ ara aadir esta antena3 antena3 en el apartado apartado ante antena na copo copola larr3 elim elimin ine e la ante antena na e:is e:iste tent nte e >pul >pulsa sand ndo o sobr sobre e la 4 ro-a ro-a@3 @3 y a continuación aada la antena especi.icada pulsando sobre el botón verde con un F$
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Precuencia de re.erencia; 960 M( >e:tremo superior de la banda descendente de 8)M!900@$ ,limine primero todas las .recuencias que aparecen por de.ecto >de nuevo pulsando sobre las 4 ro-as@ y despuDs pulse sobre el F verde para aadir la .recuencia especi.icada$ olari(ación; olari(ación; vertical$ 5ltura; G0 m$ otencia; 10 %$
Manten#a para los dem's par'metros sus valores por de.ecto$ )i necesita modi.icar los par'metros de la estación base una ve( creada3 puede acceder nuevamente a travDs de la pestaa equipos en el apartado sector$ +e.ina las si#uientes caractersticas del receptor del terminal móvil dentro de la pestaa equipos en el apartado par'metros de recepción del t erminal$ •
• •
5ntena isótropa de #anancia 0 d$ ara ello tome una antena omnidireccional omnidireccional para para servi servicio cio 8)M >la que viene viene por de.ect de.ecto3 o3 por e-empl e-emplo@ o@ y modi.i modi.ique que sus par'metros para que ten#a una #anancia de 0d$
olari(ación; olari(ación; vertical$ 5ltura; 13 m$ ,l receptor tiene una sensibilidad de !10G dm3 y se desea un porcenta-e de
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ara &allar la potencia umbral se si#uió el si#uiente procedimiento; !
,l mar#e mar#en n de desva desvane neci cimi mien ento to lo#! lo#!no norm rmal al se &all &alla a de la si#u si#uie ient nte e mane manera ra33 para esto se utili(a la si#uiente .ormula;
+onde;
)iendo los valores de las constantes;
!
eempla eempla(and (ando o con los valor valores es que que nos pide3 pide3 porcenta porcenta-e -e de cobertura cobertura perimetr perimetral al del 90R >LO0$9@;
or lo tanto nuestro mar#en de desvanecimiento lo#!normal lo#!normal es;
La potencia umbral >potencia mediada@3 que es la suma de la sensibilidad de re.erencia3 la de#radación de#radación por ruido y el mar#en de desvanecimiento lo#!normalI lo#!normalI es;
Como es una simulación ideal tomaremos la de#radación por ruido como 03 en todo caso este valor lo ponemos en el simulador;
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ara de.inir el modelo de propa#ación que se va a emplear se utili(a la opción mDtodo de c'lculo dentro de la pestaa par'metros de c'lculo y pulsando sobre el icono cuadrado blanco con dos ticSs$ na ve( pulsado ese icono observe que dentro del menE desple#able mDtodo de propa#ación est'n de.inidos varios modelos$ )eleccionando cada uno de ellos se pueden ver sus par'metros$ +e.ina3 o compruebe que est'n ya de.inidos3 los si#uientes modelos de c'lculo3 y as#neles un nombre representativo$ *o utilice corrección estadstica ni e.ecto de lluvia o #ases$ ara el .actor de modi.icación del radio terrestre utilice el valor est'ndar de KAG$ 1@ Sumur Sumura! a!ata ata en medio medio rural rural con resolu resolució ción n de K00 m >que es el m':imo m':imo que se puede obtener de .orma #ratuita@$ 2@ ec$ "/! "/! $ $ 26!1 26!10 0 con resolu resolución ción de de K00 m$ m$ G@ MDto MDtodo do L) L) con con reso resolu luci ción ón de K00 K00 m$ ,ste ,ste mDto mDtodo do cons consid ider era a prop propa# a#ac ació ión n en espacio libre si e:iste visión directa3 y atenuación atenuación in.inita en caso contrario$ )eleccione una (ona de cobertura apro:imadamente cuadrada de lado G0 Sm centrada en la estación base$ ara ello vaya a la pestaa 'rea de c'lculo y pinc&e sobre el icono con un rect'n#ulo a tra(os y una .lec&a$ ,sto nos permite de.inir un 'rea de c'lculo directamente sobre sobre el plano plano pinc& pinc&and ando o sobre sobre dos puntos puntos del mismo >que >que ser'n ser'n las las dos dos esquin esquinas as opuest opuestas as de un rect'n rect'n#ul #ulo@$ o@$ na na ve( .i-ada .i-ada un 'rea 'rea de c'lcul c'lculo o inici inicial al esta esta se puede puede modi.icar arrastrando las esquinas$ ara saber cu'nto mide el lado del 'rea de c'lculo #enerada se puede utili(ar la &erramienta de medida situada en el menE #eneral de la aplicación >una recta con las letras Tm superpuestas@$ /Dn#ase en cuenta que se pide dibu-ar el 'rea de cobertura de .orma . orma apro:imada$
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ellos se puede modi.icar en la pestaa ran#os de resultado$ Pi-e el primero de los modelos anteriores para el c'lculo de la cobertura3 y pulse la opción c'lculo #ratuito a ba-a resolución >situado a la i(quierda de la pantalla principal del pro#rama en la pestaa acciones@$ na ve( que &aya terminado t erminado el proceso de c'lculo >se indica en una barra de tareas que se abre en la parte in.erior derec&a de la &erramienta@3 los resultados se pueden consultar seleccionando la carpeta resultados >carpeta de color morado@ del estudio3 y pinc&ando sobre abrir #estor de resultados dentro del menE acciones$ na ve( dentro del #estor de resultados3 seleccionamos seleccionamos los resultados de nuestro estudio y pic&amos sobre el botón abrir resultado$
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PREG'(# ): *bservar+ %ue la distancia de cobertura no es la misma en todas las direcciones eniendo en cuenta el modelo de c+lculo utilizado, -"or %u. esto es as/0 Puede resultarle !til la herramienta calcular "erfil del men! "rinci"al Res"uesta: ,l mDtodo usado en la ima#en si#uiente corresponde al mDtodo Sumura!ata3a pesar de que el patrón de radiación es omnidireccional e ideal3 la distancia de cobertura no es la misma en todas las direcciones3 esto es porque e:isten obst'culos en el medio3 no es un medio &ori(ontal planoI sino que tiene relieves y la seal se ver' atenuada$
M.todo *1umura23a *1umura23ata ta
Perfl del terreno
,ste es el per.il tomado desde el punto central3 &asta el e:tremo superior derec&o del 'rea de curvatura3 vemos que la seal se atenEa y el radio no es uni.orme debido a que el terreno no es totalmente plano
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PREG'( PREG'(# # 4: Realic Realice e el c+lcu c+lculo lo de la cober cobertur tura a "ara "ara los restan restantes tes modelo modelos s de "ro"agación anteriormente definidos *bserve e inter"rete las diferencias entre los modelos, en t.rminos de forma de la zona de cobertura y tiem"o de c+lculo 5onde a"ar a"arez ezca can n huec huecos os de cobe cobert rtur ura, a, trat trate e de iden identi tifi fica carr la razó razón n Para Para hace hacerr la com"aración, se recomienda crear crear una co"ia del estudio $du"licar estudio en el men! acciones& acciones& modifican modificando do !nicament !nicamente e a%uellos a%uellos "ar+metr "ar+metros os %ue sean relevante relevantes s "ara cada m.todo %ue se vaya a utilizar M.todo Rec 'I2R P 6472)8
M.todo 9/nea de ista o 9*;
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na de las ra(ones por las que puede e:istir &uecos de cobertura es la .orma en la antena radiada se#En el modelo de propa#ación3 porque podemos darnos cuenta que al utili(ar un modelo Sumura!ata no e:isten &uecos pero su cobertura no es muy #rande3 en cambio al utili(ar los otros dos modelos3 aumentamos aumentamos dr'sticamente la cobertura pero se crearon &uecos de cobertura en ciertos sectores$ Como se puede observar en las G im'#enes3 el mDtodo L) tiene una me-or respuesta en cobertura ya que el 'rea de mayor cobertura es la de color a(ul3 y es -ustamente la que tiene m's potencia3 en otras palabras tiene un mayor ran#o de (ona3 esto es posiblemente debido a que es una medición en campo abierto y el mDtodo L) es el m's óptimo para este tipo de medición$ "=$$ "=
C5LC C5 LCL L +, +, C C, ,/ /5 5 ,* ,* ,*/ /* * 5L 5L
5nalice3 de acuerdo con los modelos de Sumura!ata y ec$ $ 26 del "/3 la me-ora de cobertura que se obtiene por medio de los si#uientes cambios; 1@ Mover Mover la estación estación base base a un punto m's alto$ alto$ tilice tilice para para ello la opción opción optimi optimi(ar (ar punto3 que est' en la ventana donde se de.inió la posición inicial del transmisor$ 2@ "ncrementa "ncrementarr la altura altura en en 10 ó en en 20 m$ G@ "ncrem "ncrement entar ar la la poten potencia cia en en 6 d$ d$ PREG'(# <: -Cu+l de las tres o"ciones incrementa m+s la cobertura en la zona ba=o estudio0 -Por %u.0 !
,stas ,stas son las las medici medicion ones es usando usando el el mDtodo mDtodo de Sumu Sumura! ra!at ata3 a3 varian variando do solo un par'metro a la ves
Al#2ra 3.45 -46
P#en"ia 3
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!
,sta ,stas s son son las las medi medici cion ones es usand usando o el mDto mDtodo do ec$ ec$ "/! "/! $ 26! 26!10 1033 variando solo un par'metro a la ves
Al#2ra 3.45
P#en"ia 3 -46 (Ya 72e a25en#ar la 8#en"ia en /d9 si:ni&"a d28li"arla ds ve"es)
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ara ello es necesario crear un nuevo estudio con un nuevo transmisor$ Como en casos anteriores en ve( de de.inir otra ve( todos los par'metros3 puede duplicar el estudio3 y modi.icar en el estudio duplicado los par'metros necesarios$ ,n el nuevo estudio sitEe el transm transmiso isorr en el punto punto >K1U01 >K1U01VKK VKK$H $HW*3 W*3 00GU2 00GU2HVG HVG9$0 9$06W 6W%@ %@ que est' est' dentr dentro o de un (ona (ona montaosa$
LUUE UISPE *ENNY MIRELLA % FIEE UNMSM
$4
PREG'( PREG'(# # >: Com"ar Com"are e el efecto efecto sobre sobre la cobert cobertura ura de los cambi cambios os anter anterior iores, es, utilizando el modelo de la Rec P 647 del 'I2R -Cu+l de las o"ciones es m+s efectiva en este caso0 -Por %u.0 esultados con la altura en G0m3 potencia en 10 d y posición de la antena dada$ Res"uesta:
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5ltura O 0m
LUUE UISPE *ENNY MIRELLA % FIEE UNMSM
$$
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Moviendo al punto óptimo de la antena
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me-oró3 tal ve( si aumentamos m's al altura se obtendran me-ores resultados pero no es viable una altura de la antena muy alta$ ,n cambio s movemos el punto situado de la antena a otro lu#ar donde sea el punto m's alto del terreno entonces si me-orara >punto óptimo@ como se puede ver en la ima#en3 la cobertura aumentó3 la seal lle#ó a m's lu#ares pero aun as no se puede cubrir todo el 'rea$ =$
C,/5 ,* ,*/* 5* ,n este apartado se comparan varios mDtodos de propa#ación propa#ación en entorno urbano$ Cree un nuevo estudio de cobertura y de.ina una estación base >transmisor@ con los si#uientes par'metros; • • • • • •
Coordenadas; 4; KK1GKI ; KK7H92H m$ 5ntena; dipolo dipolo en NO2 >&al.!Bave >&al.!Bave dipole@$ Precuencia de re.erencia; 960 M($ olari(ación; olari(ación; vertical$ 5ltura; K m >altura de la torre situada situada sobre el edi.icio@$ edi.icio@$ otencia; KG dm$
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MDtodo Sumura!ata
MDtodo ec$ "/! $ 26!10
PREG'(# PREG'(# 6: -?u. diferencias observa entre los m.todos utilizados0 Res"uesta: ,l modelo ec$ 26 nos muestra una cobertura m's amplia y con m's &uecos3 en cambio con el modelo Sumura!ata nos da como resultado una cobertura muy pequeaI pero la
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btenidos los si#uientes resultados;
PREG'(# 7: Comente la cobertura obtenida de acuerdo con el modelo %ue acaba de definir Res"uesta: 5l de.inir el nuevo modelo se puede observar observar que la posee una menor cobertura cobertura en relación con Sumura!ata >primera ima#en@$ Con este resultado tienes un 'rea de cobertura de 1$K Sm apro:imadamente3 la seal de
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PREG'(# A: Razone %u. cambios deber+ introducir en el estudio de cobertura de Birio2*n9ine "ara observar la cobertura en sentido ascendente Res"uesta: ara ara poder poder &acer &acer la medici medición ón en sentid sentido o ascend ascendent ente e se debe debe traba traba-ar -ar con ,ditab ,ditable le 5mpliado3 ya que este mDtodo nos permite cambiar los par'metros pedidos3 como la altura de la antena3 por tal ra(ón este es el mDtodo que debemos usar$ usar$
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PREGUNT PREGUNTA A 9: Si se desprecia desprecia el eecto eecto de variación de cobertura cobertura debido a la recuencia, có!o se pueden visuali"ar si!ult#nea!ente en un solo estudio las coberturas descendente $ ascendente%
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LUUE UISPE *ENNY MIRELLA % FIEE UNMSM
$1
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5I#GR#M# 3*RI*(#9
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PREG'(# )8: Considere ahora %ue la estación base utiliza la antena directiva %ue acaba de crear En el "rograma, -dónde debe seleccionarse la nueva antena "ara ver la cobertura en sentido descendente: en el transmisor o en el rece"tor0 -D en sentido ascendente0 Res"uesta: )e debe seleccionar en la opción transmisor >/)!M)@ y en el receptor para ascendente >M)!/)@ PREG'(# )): Calcule la cobertura en sentido ascendente con la antena %ue acaba
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La zona zona de cobe cobert rtur uraa camb cambia ia en relación al diagrama de radiación, ya que que medi median ante te esta esta modi modififica cació ciónn se puede observar que presenta inte interf rfer eren enci ciaa en la part partee sur sur de la cobertura.
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•
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acer uso de 4irio!online nos permitió reali(ar c'lculos que antes eran muy tediosos de reali(ar3 adem's de plantear situaciones casi reales$ ,l mDtodo de lnea de vista >L)@ tiene una me-or respuesta a los lu#ares de terreno amplio o trayecto despe-adoI despe-adoI pues nos dió una #ran cobertura3 por lo tanto L) es el me-or mDtodo para campo abierto$ )i queremos conse#uir m's cobertura de una estación base3 se tiene que buscar el punto m's óptimo de su ubicación3 elevar m's la antena o aumentar la potencia3 o usar estos G mDtodos a la ve($