Mer: Umyinge weMpahla yemozulu, ongumyinge wexabiso elisebenzayo lobukhulu be-vector kwixabiso lokuqina kwempazamo (umyinge wesikwere osisikwere kwisikwere se-vector vector). Yenye yeempawu eziphambili zokulinganisa umgangatho weempawu zeTV zedijithali. Kubaluleke kakhulu kwiziphumo ze-logaritimiction zezinto ezigxunyekwe kumqondiso wokuhambisa idijithali. Kuyafana nomlinganiso wengxolo okanye umyinge we-nearner-to-to-to-ingxolo esetyenziswa kwinkqubo ye-analog. Yinkqubo yokugweba inxenye eyintloko yokunyamezelana okungapheliyo. Ezinye iimpawu ezifanayo ezinje nge-Ber Inqanaba le-Ber
Ixabiso le-mer licacisiwe kwi-DB, kwaye likhulu lexabiso le-mer, engcono umgangatho womqondiso. Ingcono umqondiso, usondelelene kwiimodyuli zemodyuli kwizikhundla ezifanelekileyo, kwaye ngokuchaseneyo. Iziphumo zovavanyo zeer zibonisa ubuchule bomthombo wedijithali ukubuyisela inani le-binary, kwaye kukho i-raciol-to-in-ratio yengxolo (i-S / n) efana nomqondiso. Umqondiso wemodyuli we-QAM unemveliso kwindawo engaphambili kwaye ungena ekhaya ngenethiwekhi yokufikelela. Isalathisi se-mep siya kusincothula ngokuthe ngcembe. Kwimeko yomzobo we-concelting 64Qam, ixabiso le-proresty ye-Mervey yi-23.5db, kwaye i-256Qam i-28.5db (inokuthi ikhuphe isiginali intambo enesiqhelo yentambo okanye isiphelo esingaphantsi komgangatho). Ukuba ingaphantsi kweli xabiso, umzobo wengxolo awuyi kuvalwa. IIMPENDULO ZEEMPAWU ZOKUGQIBELA EZIQHELEKILEYO:
Ukubaluleka kwe-mer mer ithathelwa ingqalelo njengendlela yokulinganisa, kunye nentsingiselo ye-mer yile:
①. Ibandakanya iintlobo ezahlukeneyo zomonakalo kumqondiso: Ingxolo, i-Carrier, i-IQ Amlplight Ukungalingani, kunye nengxolo yenqanaba.
②. Ibonisa ubuchule bomsebenzi wedijithali ukubuyisela iinombolo zeBinary; Ibonisa inqanaba lomonakalo kwimiqondiso yedijithali emva kokudluliselwa kwinethiwekhi.
③. I-SNR yiparameter ye-Baseband, kwaye i-meer yiparamitha yerediyo yerediyo.
Xa umgangatho womqondiso wezithobelelo kwinqanaba elithile, iisimboli ziya kuthotywa ngokungachanekanga. Ngeli xesha, eyona mpazamo i-BIT i-BER inyuka. I-Ber (inqanaba le-Bit ye-Bit): Inqanaba le-Fit Ireyitha, ichazwe njengomyinge wenani leempazamo kwinani lilonke lezinto ezimbi. Kwimiqondiso yedijithali yedijithali, kuba ii-bits ze-binary zidluliselwa, inqanaba lempazamo elincinci libizwa ngokuba yireyithi yempazamo encinci (i-Ber).
I-Ber = I-ERROR IXESHA LOKUGQIBELA / Ixabiso le-bit lilonke.
I-Ber ichazwe ngokubanzi ichazwe kwiNtetho yeSayensi, kwaye iphantsi i-Ber, engcono. Xa umgangatho womqondiso ulunge kakhulu, i-Ber Ixabiso ngaphambi nasemva kokulungiswa kwesigqikelelo lifanayo; Kodwa kwimeko yokuphazanyiswa okuthile, amanani ombane we-Bert ngaphambi nasemva kokulungiswa kwesimposo ahlukile, kwaye emva kokulungiswa kwempazamo inqanaba lempazamo elincinci liphantsi. Xa imposiso ye-BIT i-2 × 10, i-mosaic yenxalenye ivela ngamaxesha ngamaxesha, kodwa isenokujongwa; I-Ber i-BERIT i-1 × 10-4, inani elikhulu le-mosaics livele, kwaye umzobo oDlala ubonakala ungaphakathi; I-Ber enkulu kune-1 × 10-3 ayinakujongwa konke konke. Jonga. Isalathiso seBerR lixabiso kuphela kwaye alibonisi ngokupheleleyo imeko yezixhobo zenethiwekhi. Ngamanye amaxesha ibangelwa kukunyuka ngesiquphe ngenxa yokuphazanyiswa kwephanyano, ngelixa i-mer ichasene ngokupheleleyo. Yonke inkqubo inokusetyenziswa njengohlalutyo lwempazamo yedatha. Ke ngoko, i-mer inokubonelela ngesilumkiso kwangoko ngemiqondiso. Xa umgangatho womqondiso uyancipha, i-mer iya kuncipha. Ngokwanda kwengxolo nokuphazamiseka kwinqanaba elithile, i-Mer iya ngokuthe ngcembe, ngelixa i-ber ihlala ingaguqukanga. Kuphela kuxa uphazanyiswa kukonyusa ukuya kuthi ga kwinqanaba elithile, i-bir i-ber iqala ukuwohloka xa i-mer ihla ngokuqhubekayo. Xa i-mer ihla ukuya kwinqanaba lomsebenzi, i-ber iya kwehla kabukhali.
Ixesha lePosi: Feb-23 ukuya kwi-23233