Chithunzi 6-6 ndi chojambula chamtundu wa digito baseband transmission system. Amapangidwa makamaka ndi fyuluta yotumizira (jenereta yamakina), njira, kulandira fyuluta ndi kusankha zitsanzo. Pofuna kuonetsetsa ntchito yodalirika komanso yadongosolo ya dongosololi, payeneranso kukhala ndi ndondomeko yofanana.
Ntchito za bokosi lililonse pachithunzichi komanso momwe zimakhalira potumiza ma siginecha zikufotokozedwa motere:
(1) Jenereta ya siginecha ya Channel (sefa yotumiza). Ntchito yake ndikupanga baseband sign waveform yoyenera kutumizira mayendedwe. Chifukwa cholowetsacho nthawi zambiri chimakhala khodi yopatsirana yomwe imapangidwa ndi code encoder, mawonekedwe ofananirako oyambira nthawi zambiri amakhala amtundu wamakona anayi, ndipo mawonekedwe ake ndi otakata kwambiri, omwe sangathandize kufalitsa. Fyuluta yotumizira imagwiritsidwa ntchito kupondereza band yolowera ma frequency band ndikusintha ma code transmission kukhala baseband sign waveform yoyenera kufalitsa njira.
(2) Channel. Ndi sing'anga yomwe imalola kuti ma sign a baseband adutse, nthawi zambiri njira yamawaya, monga zopindika, chingwe coaxial, ndi zina zambiri. mawonekedwe a transmission waveform. Kuphatikiza apo, tchanelocho chimayambitsa phokoso n(t) ndikuganiza kuti ndi phokoso loyera la Gaussian lomwe limakhala ndi ziro.
(3) Kulandira fyuluta. Imagwiritsidwa ntchito kulandila siginecha, kusefa phokoso la tchanelo ndi zosokoneza zina momwe ndingathere, kulinganiza mawonekedwe a tchanelo, ndikupanga mawonekedwe a baseband kuti agwirizane ndi zisankho.
(4) Kusankha zitsanzo. Pansi pa mawonekedwe osasangalatsa opatsirana ndi phokoso, mawonekedwe otulutsa a fyuluta yolandirira amayesedwa panthawi yodziwika (yoyendetsedwa ndi kugunda kwanthawi pang'ono) kuti achire kapena kukonzanso chizindikiro cha baseband.
(5) Kuthamanga kwa nthawi ndi kutulutsa kofanana. Kuthamanga kwanthawi kochepa komwe kumagwiritsidwa ntchito poyesa sampuli kumatengedwa kuchokera ku siginecha yomwe idalandilidwa ndi ma synchronous extraction circuit, ndipo kulondola kwanthawi yayitali kumakhudza mwachindunji chigamulo.
Izi ndi ShenzhenZithunzi za HDV Phoelekitironi Zamakono Ltd. kubweretsa inu za "The zikuchokera digito baseband chizindikiro kufala dongosolo", ndikuyembekeza kukuthandizani, ndi ShenzhenZithunzi za HDV Phoelekitironi Kuwonjezeka kwa Technology LtdONUmndandanda, transceiver mndandanda,OLTmndandanda, komanso kupanga gawo mndandanda, monga: Kulankhulana gawo kuwala, gawo kuwala kulankhulana, maukonde kuwala gawo, kulankhulana kuwala gawo, kuwala CHIKWANGWANI gawo, Efaneti kuwala CHIKWANGWANI gawo, etc., angapereke lolingana utumiki khalidwe zosowa osiyana owerenga '. , landirani kudzacheza kwanu.
