Mer: Iyo modulation chikanganiso chiyero, chinova chiyero chinoshanda cheVector Kukurukurirana kweKutamba kweKutamba Kwekukanganisa kweiyo Yakakodzera Vector Ukuru kune iyo Score yeVanhu vekrita vekrita). Iyo ndeimwe yezviratidzo zvikuru kuyera mhando yeiyo dijitir tv zviratidzo. Izvo zvakakosha kwazvo kune iyo logarithmic kuyerwa mhedzisiro yekukanganisa kwakanyanya pane iyo dijitari modulation chiratidzo. Zvakafanana neyechiratidzo-kune-ruzha ratio kana inotakura-kune-ruzha ratio inoshandiswa mune analog system. Iyo ndiyo system yekutonga inotsoropodza chikamu chekutadza kushivirira. Zvimwe zvakafanana zviratidzo zvakadai seBer Bit Kanganiso Rate, C / N Carrier-kune-ruzha Ratio, Simba Level Avhareji Simba, Dombo reConstellation, diagram, nezvimwe.
Iko kukosha kweMER kunoratidzwa muDB, uye yakakura kukosha kweMer, zvirinani chiratidzo. Zvirinani chiratidzo, icho chakaswera zviratidzo zvakasungwa zviri kunzvimbo yakakodzera, uye zvinopesana. Mhedzisiro yekuyevedza inoratidza kugona kweiyo digital inogamuchira kudzoreredza nhamba yeiyo binary, uye pane chiratidzo chechiratidzo-kune-ruzha ratio (s / n) yakafanana neiyo baseband sign. Iyo Qam-yakasungirirwa chiratidzo chinobuda kubva kumberi kwekupedzisira uye vanopinda mumba kuburikidza neyekuwanikwa network. Iyo inoratidza chiratidzo chinotsamwisa zvishoma nezvishoma. Munyaya yeDziviriro yeDziviriro 64qam, Iyo Empirical Chikumbaridzo kukosha kweMer ndeye 23.5db (iyo yekumberi inopfuura iyo isingagumi inokonzerwa neyakagadzirwa nemhando yekutumira tambo kana kuti muganho wepamberi. Kana yakaderera pane iyi kukosha, dhizaini yeboka reboka racho harina kukiyiwa. Mer chiratidzo chepamberi-chekupedzisira chekubuda zvinodikanwa: Kwekupedzisira 64 / 256Qam, Sublifier>
Kukosha kweMer Mer kunoonekwa sechiyero cheSNR chiyero, uye zvinorehwa nemamer ndeye:
①. Inosanganisira mhando dzakasiyana dzekukuvara kune chiratidzo: ruzha, kutakura kutakura leakage, iq amplitude kusimba, uye ruzha rwehare.
②. Iyo inoratidza kugona kwemabasa emijitari kudzoreredza nhamba dzebhuruu; Inoratidza iyo degree rekukuvara kweDhijitari TV masaini mushure mekupandukira kuburikidza network.
③. Snr chidimbu chebhokisi, uye mer ishedhiyo frequency paramende.
Kana chiratidzo chemhando chinosvibisa kune imwe nhanho, zviratidzo zvichazopedzisira zvave zvakashongedzwa zvisizvo. Panguva ino, iyo chaiyo chikanganiso chikanganiso chigero chinowedzera. BER (Bit Kanganiso Rate): Bit Chikanganiso chiyero, inotsanangurwa seyakaenzana yehuwandu hwezvakarukwa mabheti kusvika kune huwandu hwakazara hwemabhiti. Zvemasaini yeBinary Digital, sezvo Binary Bits inotenderedzwa, iyo bit kukanganisa mwero inonzi iyo bit bit kukanganisa (ber).
BER = kukanganisa zvishoma / huwandu hwakazara.
Ber inowanzo kuratidzwa musainzi nonation, uye yakadzika iyo ber, iri nani. Kana chiratidzo chiratidzo chakanyanya kunaka, iwo mabhe matsvina zvisati zvaitika uye mushure mekururamisa kururamisa zvakafanana; Asi mune imwe nyaya yekukanganisa, iyo ber tsika zvisati zvaitika uye mushure mekururamisa kururamisa kwakasiyana, uye mushure mekururamisa kururamisa chidimbu chakarongeka chakaderera. Kana iyo bit chikanganiso iri 2 × 10-4, chikamu chechidimbu chinoonekwa apo neapo, asi chinogona kutaridzwa; Iyo inorova ber ndeye 1 × 10-4, nhamba huru yeMosesiki inoonekwa, uye mufananidzo wekutamba unoonekwa unopindirana; BER Chikuru kupfuura 1 × 10-3 haigone kutariswa zvachose. Tarisa. Iyo Ber Index inongori chete kukosha kwereferenti uye haina kunyatsoratidza chimiro chemidziyo yese yenetwork. Dzimwe nguva zvinongokonzerwa nekuwedzera kamwe kamwe nekuda kwekukanganisika kwekukanganisa, nepo mer zvakazara zvakatarisana. Maitiro ese anogona kushandiswa seyakagadziriswa data yekukanganisa. Naizvozvo, mer anogona kugovera yambiro yekutanga nezvemasaini. Kana mhando yemagazini inoderera, mer ichaderera. Nekuwedzera kweruzha uye kukanganiswa kusvika kune imwe nhanho, mer ichaderera zvishoma nezvishoma, nepo Ber ichiramba isina kuchinjika. Chete kana kukanganiswa kunowedzera kusvika kune imwe nhanho, mer iyo ber inotanga kuderera kana iyo mer inodonha ichikwira nguva dzose. Kana iyo mer inodonha padanho padanho, iyo ber ichadonha zvakanyanya.
Kutumira Nguva: Kukadzi-23-2023