MER: The modulation kukanganisa reshiyo, inova reshiyo yehukoshi hunoshanda hweiyo vector magnitude kune hunoshanda kukosha kwekukanganisa ukuru padhayagiramu yenyeredzi (reshiyo yeskweya yeyakanakira vector magnitude kune sikweya yekukanganisa vector magnitude) . Icho chimwe chezviratidzo zvikuru zvekuyera kunaka kwe digital TV zviratidzo. Izvo zvine kukosha kukuru kune iyo logarithmic kuyerwa mhedzisiro yekukanganiswa kwakaiswa pane yedhijitari modulation siginecha. Iyo yakafanana neiyo chiratidzo-kune-ruzha reshiyo kana mutakuri-kune-ruzha reshiyo inoshandiswa muanalog system. Iro hurongwa hwekutonga Chikamu chakakosha chekutadza kushivirira. Zvimwe zvakafanana zviratidzo zvakaita seBER bit kukanganisa mwero, C/N mutakuri-kune-ruzha reshiyo, chiyero chemagetsi avhareji simba, dhizaini yenyeredzi, nezvimwe.
Kukosha kweMER kunoratidzwa mudB, uye iyo yakakura kukosha kweMER, ndizvo zviri nani chiratidzo chemhando. Izvo zvirinani chiratidzo, padyo neiyo modulated zviratidzo zviri panzvimbo yakakodzera, uye zvinopesana. Mhedzisiro yekuedzwa kweMER inoratidza kugona kweiyo inogamuchira yedhijitari kudzoreredza iyo binary nhamba, uye kune chinangwa chechiratidzo-kune-ruzha chiyero (S/N) chakafanana neicho chebhendi chiratidzo. Iyo QAM-modulated chiratidzo inobuda kubva kumberi kwekupedzisira uye inopinda mumba kuburikidza netiweki yekuwana. Iyo MER chiratidzo ichadzikira zvishoma nezvishoma. Panyaya yedhayagiramu yenyeredzi 64QAM, iyo empirical pachikumbaridzo kukosha kweMER i23.5dB, uye mu256QAM iri 28.5dB (yekumberi-kuguma kuburitsa kunofanirwa kunge kuri Kana yakakwira kupfuura 34dB, inogona kuona kuti siginecha inopinda mumba zvakajairika. , asi hazviregi kusaenzana kunokonzerwa nemhando yetambo yekutapurirana kana iyo sub-mberi yekupedzisira). Kana yakaderera pane kukosha uku, dhizaini yenyeredzi haizovharwe. MER chiratidzo chemberi-yekupedzisira modulation inobuda zvinodiwa: Ye64/256QAM, kumberi-kuguma> 38dB, sub-kumberi-kuguma> 36dB, optical node> 34dB, amplifier> 34dB (yechipiri ndeye 33dB), magumo emushandisi> 31dB (yechipiri ndeye 33dB. ), pamusoro pe5 A kiyi MER poindi inowanzoshandiswa kutsvaga matambudziko etambo yeTV.
Kukosha kweMER MER kunoonekwa sechimiro chechiyero cheSNR, uye chirevo cheMER ndechekuti:
①. Inosanganisira akasiyana marudzi ekukuvadza kune chiratidzo: ruzha, mutakuri kuvuza, IQ amplitude kusaenzana, uye ruzha rwechikamu.
②. Inoratidza kukwanisa kwemabasa edhijitari kudzorera nhamba dzebhinari; inoratidza dhigirii rekukuvadza kumasaini eTV edhijitari mushure mekufambiswa kuburikidza netiweki.
③. SNR iri baseband parameter, uye MER iredhiyo frequency parameter.
Kana iyo yemhando yechiratidzo ichidzikisira kune imwe nhanho, zviratidzo zvinozopedzisira zvanyorwa zvisizvo. Panguva ino, iyo chaiyo bit kukanganisa mwero BER inowedzera. BER (Bit Error Rate): Bit kukanganisa mwero, inotsanangurwa sereshiyo yehuwandu hwemabhiti ekukanganisa kusvika kuhuwandu hwemabhiti. Kune mabhanari edhijitari masaini, sezvo mabhinari mabhiti achifambiswa, mwero wekukanganisa unonzi bit error rate (BER).
BER = Kukanganisa Bit Rate / Yese Bit Rate.
BER inowanzoratidzwa mune zvesainzi notation, uye yakaderera iyo BER, zviri nani. Kana iyo chiratidzo chemhando yakanaka kwazvo, iyo BER inokoshesa pamberi uye mushure mekugadzirisa kukanganisa kwakafanana; asi kana pane kumwe kupindira, iyo BER inokoshesa pamberi uye mushure mekugadzirisa kukanganisa kwakasiyana, uye mushure mekugadzirisa kukanganisa The bit error rate yakaderera. Kana kukanganisa kudiki kuri 2 × 10-4, chikamu mosaic chinoonekwa nguva nenguva, asi chinogona kutariswa; iyo yakakosha BER ndeye 1 × 10-4, nhamba huru yemamosaic inooneka, uye mufananidzo wekutamba unotaridzika uripo; BER yakakura kupfuura 1 × 10-3 haigone kuonekwa zvachose. watch. Iyo BER index inongova yereferensi kukosha uye hairatidzi zvizere mamiriro eiyo yese network michina. Dzimwe nguva zvinongokonzerwa nekuwedzera kamwe kamwe nekuda kwekukanganiswa kwepakarepo, nepo MER inopesana zvachose. Iyo yese maitiro inogona kushandiswa se data kukanganisa kuongororwa. Naizvozvo, MER inogona kupa yambiro yekutanga yezviratidzo. Kana iyo chiratidzo chemhando yadzikira, MER inodzikira. Nekuwedzera kweruzha uye kupindira kune imwe nhanho, MER inoderera zvishoma nezvishoma, nepo BER ichiramba isina kuchinjika. Chete kana kukanganisa kunowedzera kusvika pamwero wakati, MER Iyo BER inotanga kushata kana iyo MER ikaramba ichidonha. Kana iyo MER inodonha kusvika pachikumbaridzo, iyo BER inodonha zvakanyanya.
Nguva yekutumira: Feb-23-2023