性(xing)能特點:
(1)工(gong)(gong)作穩定(ding),覆蓋效(xiao)果(guo)好(hao):光(guang)纖(xian)直放站(zhan)(zhan)通過光(guang)纖(xian)傳輸信號,不受地理(li)環(huan)境、天氣變化(hua)或基站(zhan)(zhan)覆蓋范(fan)圍調整(zheng)的影響,因此工(gong)(gong)作穩定(ding),覆蓋效(xiao)果(guo)好(hao)。
(2)設(she)(she)計(ji)和(he)施(shi)工更為靈(ling)活:光纖(xian)直放站(zhan)在設(she)(she)計(ji)時無需(xu)考慮(lv)安裝(zhuang)地(di)點能否接(jie)收到(dao)信號;不需(xu)考慮(lv)收發隔離(li)問題,選址方便(bian);覆蓋天線(xian)可根(gen)據(ju)需(xu)要(yao)采用全向或(huo)定向天線(xian)。另(ling)外射頻信號能夠在很小(xiao)的傳(chuan)送損失的情況下(xia)被傳(chuan)送到(dao)遠達20公里的遠處,光纖(xian)很細,容(rong)易敷(fu)設(she)(she)。因此,設(she)(she)計(ji)和(he)施(shi)工的靈(ling)活性大(da)。
(3)避(bi)免同(tong)頻干擾(rao)(rao),可全向覆(fu)蓋(gai),干擾(rao)(rao)少(shao):光纖直放站(zhan)是為了(le)擴大或(huo)延(yan)續基(ji)站(zhan)的(de)覆(fu)蓋(gai)范圍,把下行(xing)射頻信(xin)號變成光纖后,從基(ji)站(zhan)到(dao)遠程區域,可使(shi)干擾(rao)(rao)及插入損(sun)失減(jian)小到(dao)最(zui)小。
(4)可(ke)提高增益而不會自(zi)激,有(you)利于加大下(xia)行(xing)信號發(fa)射功率;
光(guang)(guang)(guang)纖直(zhi)(zhi)(zhi)放(fang)站(zhan)是由(you)近(jin)端(duan)機(ji)(ji)(ji)和(he)遠構成(cheng)(cheng)(cheng)的(de)(de)(de)(de)。近(jin)端(duan)機(ji)(ji)(ji)通過耦(ou)合(he)器耦(ou)合(he)基(ji)(ji)站(zhan)下行(xing)(xing)信(xin)(xin)(xin)號(hao),并入(ru)近(jin)端(duan)機(ji)(ji)(ji)射(she)頻(pin)(pin)光(guang)(guang)(guang)纖模(mo)塊(kuai)將基(ji)(ji)站(zhan)的(de)(de)(de)(de)下行(xing)(xing)射(she)頻(pin)(pin)信(xin)(xin)(xin)號(hao)通過電(dian)(dian)光(guang)(guang)(guang)轉(zhuan)(zhuan)換部件轉(zhuan)(zhuan)換成(cheng)(cheng)(cheng)光(guang)(guang)(guang)信(xin)(xin)(xin)號(hao)并經(jing)光(guang)(guang)(guang)纖傳(chuan)輸(shu)至(zhi)遠端(duan)機(ji)(ji)(ji),在(zai)遠端(duan)機(ji)(ji)(ji)的(de)(de)(de)(de)射(she)頻(pin)(pin)光(guang)(guang)(guang)纖模(mo)塊(kuai)將接收(shou)到(dao)的(de)(de)(de)(de)下行(xing)(xing)的(de)(de)(de)(de)光(guang)(guang)(guang)信(xin)(xin)(xin)號(hao)轉(zhuan)(zhuan)化成(cheng)(cheng)(cheng)相(xiang)應的(de)(de)(de)(de)射(she)頻(pin)(pin)信(xin)(xin)(xin)號(hao),該射(she)頻(pin)(pin)信(xin)(xin)(xin)號(hao)經(jing)功率(lv)放(fang)大器放(fang)大變為所(suo)需要的(de)(de)(de)(de)功率(lv)電(dian)(dian)平(ping)信(xin)(xin)(xin)號(hao),并通過雙工器由(you)重發天(tian)線發射(she)出去,進(jin)行(xing)(xing)區(qu)域覆蓋;反之由(you)光(guang)(guang)(guang)纖直(zhi)(zhi)(zhi)放(fang)站(zhan)的(de)(de)(de)(de)重發天(tian)線接收(shou)到(dao)的(de)(de)(de)(de)上行(xing)(xing)信(xin)(xin)(xin)號(hao)經(jing)過低(di)噪聲放(fang)大器放(fang)大到(dao)一(yi)定的(de)(de)(de)(de)電(dian)(dian)平(ping)射(she)頻(pin)(pin)信(xin)(xin)(xin)號(hao),通過遠端(duan)機(ji)(ji)(ji)的(de)(de)(de)(de)射(she)頻(pin)(pin)光(guang)(guang)(guang)纖模(mo)塊(kuai)進(jin)行(xing)(xing)電(dian)(dian)光(guang)(guang)(guang)轉(zhuan)(zhuan)換換成(cheng)(cheng)(cheng)信(xin)(xin)(xin)號(hao)并經(jing)光(guang)(guang)(guang)纖傳(chuan)輸(shu)至(zhi)近(jin)端(duan)機(ji)(ji)(ji),在(zai)近(jin)端(duan)機(ji)(ji)(ji)的(de)(de)(de)(de)射(she)頻(pin)(pin)光(guang)(guang)(guang)纖模(mo)塊(kuai)將接收(shou)到(dao)的(de)(de)(de)(de)光(guang)(guang)(guang)信(xin)(xin)(xin)號(hao)轉(zhuan)(zhuan)化成(cheng)(cheng)(cheng)相(xiang)應的(de)(de)(de)(de)射(she)頻(pin)(pin)信(xin)(xin)(xin)號(hao),并經(jing)功率(lv)放(fang)大器變為所(suo)需要的(de)(de)(de)(de)功率(lv)電(dian)(dian)平(ping)信(xin)(xin)(xin)號(hao),并入(ru)耦(ou)合(he)器耦(ou)合(he)發送到(dao)基(ji)(ji)站(zhan),從而構成(cheng)(cheng)(cheng)由(you)光(guang)(guang)(guang)纖作為傳(chuan)輸(shu)介質的(de)(de)(de)(de)光(guang)(guang)(guang)纖直(zhi)(zhi)(zhi)放(fang)站(zhan)系統。