Iyo kureba yekutaurirana iyo isina waya yekutaurirana sisitimu inotarwa nezvinhu zvakasiyana senge akasiyana midziyo inoumba sisitimu uye nharaunda yekutaurirana. Hukama huri pakati pavo hunogona kuratidzwa neinotevera yekutaurirana nhambwe equation.
Kana iyo simba rekufambisa remuchina wekufambisira weiyo nzira yekutaurirana iri PT, iyo yekufambisa antenna kuwana iGT, uye yekushanda wavelength iri λ. Kunzwa kweanogamuchira mudziyo inogamuchira ndeye PR, iyo inogashira antenna kuwana iGR, uye chinhambwe pakati pekugamuchira uye kuendesa antennas iR, mukati mekuona chinhambwe uye munzvimbo isina kukanganiswa kwemagetsi, hukama hunotevera huripo:
PT(dBm)-PR(dBm)+GT(dBi)+GR(dBi)=20log4pr(m)/l(m)+Lc(dB)+ L0(dB) Mufomula, Lc ndiko kurasika kwekuisa kwe feeder kwe base station inotumira antenna; L0 ndiko kurasikirwa kweredhiyo panguva yekuparadzira.
Paunenge uchigadzira sisitimu, muganho wakakwana unofanirwa kusiiwa kune chinhu chekupedzisira, iyo radio wave yekuparadzira kurasikirwa L0.
Kazhinji, muganho we10 kusvika ku15 dB unodiwa kana uchipfuura nemumasango nezvivakwa zvevagari; muganho we30 kusvika 35 dB unodiwa kana uchipfuura nemuzvivakwa zvekongiri zvakasimbiswa.
Kune 800MH, 900ZMHz CDMA uye GSM frequency mabhendi, zvinotendwa kuti danho rekugamuchira nharembozha rinenge -104dBm, uye iyo chaiyo inotambirwa siginecha inofanirwa kunge iri 10dB yakakwirira kuti ive nechokwadi chinodiwa chiratidzo-ku-ruzha reshiyo. Kutaura zvazviri, kuitira kuchengetedza kutaurirana kwakanaka, simba rinogamuchirwa rinowanzoverengwa se -70 dBm. Fungidzira kuti base station ine zvinotevera paramita:
Simba rekutumira ndiro PT = 20W = 43dBm; simba rekugamuchira iPR = -70dBm;
Iyo yekudyisa kurasikirwa ndeye 2.4dB (inenge 60m feeder)
Nharembozha inogamuchira antenna kuwana GR = 1.5dBi;
Kushanda wavelength λ = 33.333cm (yakaenzana nefrequency f0 = 900MHz);
Iyo iri pamusoro yekutaurirana equation ichave:
43dBm-(-70dBm)+ GT(dBi)+1.5dBi=32dB+ 20logger(m) dB +2.4dB + kurasikirwa kwekuparadzira L0
114.5dB+ GT(dBi) -34.4dB = 20logger(m)+ kurasikirwa kwekuparadzira L0
80.1dB+ GT(dBi) = 20logger(m)+ kurasikirwa kwekuparadzira L0
Kana kukosha kwekuruboshwe kweformula iri pamusoro kwakakura kupfuura kukosha kudivi rekurudyi, ndiko kuti:
GT(dBi) > 20logor(m)-80.1dB+kurasikirwa kwekuparadzira L0. Kana kusaenzana kunobata, zvinogona kutariswa kuti hurongwa hunogona kuchengetedza kutaurirana kwakanaka.
Kana iyo base chiteshi ichishandisa omnidirectional kufambisa antenna ine kuwana kweGT = 11dBi uye chinhambwe chiri pakati pekutumira uye kugamuchira antennas iri R=1000m, iyo equation yekutaurirana inowedzera inova 11dB> 60-80.1dB+ kuparadzira kurasikirwa L0, ndiko kuti, kana iyo yekuparadzira kurasikirwa L0B <31 km inogona kuchengetedzwa mukati me 1 .
Pasi pemamiriro akafanana ekurasikirwa kwekupararira sepamusoro, kana iyo antenna yekufambisa ichiwana GT = 17dBi, kureva, kuwedzera kwe6dBi, kureba kwekutaurirana kunogona kupetwa kaviri, kureva, r = 2 makiromita. Zvimwe zvinogona kutsanangurwa nenzira imwecheteyo. Nekudaro, zvinofanirwa kucherechedzwa kuti base chiteshi antenna ine kuwana GT ye17dBi inogona chete kuve ne fan-yakaita danda kufukidzwa nehupamhi hwedanda re30 °, 65 ° kana 90 °, nezvimwewo, uye haigone kuchengetedza omnidirectional kufukidzwa.
Pamusoro pezvo, kana iyo antenna yekufambisa ichiwana GT=11dBi ikaramba isina kuchinjika mukuverenga kuri pamusoro, asi nharaunda yekuparadzira ichichinja, kurasikirwa kwekuparadzira L0=31.1dB-20dB=11.1dB, ipapo iyo yakaderedzwa 20dB yekuparadzira kurasikirwa kuchawedzera nhambwe yekutaurirana negumi, kureva, r=10 makiromita. Iyo yekuparadzira kurasikirwa izwi inoenderana neyakatenderedza electromagnetic nharaunda. Mumadhorobha, kune zvivakwa zvakawanda zvakakwirira uye kurasikirwa kwekuparadzira kwakakura. Mumaruwa ekumaruwa, dzimba dzemapurazi dzakaderera uye dziri shoma, uye kurasikirwa kwekuparadzira kuduku. Naizvozvo, kunyangwe kana magadzirirwo ehurongwa hwekutaurirana akanyatsofanana, iyo inobudirira yekuvhara huwandu ichave yakasiyana nekuda kwekusiyana kwenzvimbo yekushandisa.
Naizvozvo, pakusarudza omnidirectional, inotungamira antennas uye yakakwirira-kuwana kana yakaderera-kuwana antenna mafomu, zvinofanirwa kufunga nezve kushandisa base station antennas emhando dzakasiyana uye maratidziro zvinoenderana nemamiriro chaiwo eiyo nharembozha yekutaurirana uye nharaunda yekushandisa.
Kuti udzidze zvakawanda nezve antennas, ndapota shanya:
Nguva yekutumira: Jul-25-2025
