A cikin tsarin sadarwar dijital, abin da mai karɓa ke karɓa shine jimillar siginar da aka watsa da kuma hayaniyar tashar.
Mafi kyawun liyafar siginar dijital ya dogara ne akan mafi ƙarancin yuwuwar kuskure a matsayin ma'aunin "mafi kyau". Kurakurai da aka yi la'akari da su a cikin wannan babin galibi suna haifar da su ta hanyar farar hayaniyar Gaussian mai iyaka. Ƙarƙashin wannan zato, siginar da aka daidaita na dijital na binary ya kasu zuwa nau'ikan uku: tabbataccen sigina, siginar amincewa da siginar juzu'i, kuma ana bincika mafi ƙarancin yuwuwar kuskure ɗaya bayan ɗaya. Bugu da kari, ana nazarin yuwuwar kuskuren karɓar siginar band mai tushe da yawa.
Asalin ƙa'idar bincike shine ɗaukar jimlar ƙimar samfurin siginar mai karɓa azaman vector a cikin K-dimensional receiver vector space, da kuma raba sararin sararin samaniya zuwa yankuna biyu. Ƙayyade ko kuskure ya faru bisa ga yankin da vector ɗin da aka karɓa ya faɗi. Za'a iya samun zane-zane na toshe mafi kyawun mai karɓa kuma ana iya ƙididdige ƙimar kuskuren ta hanyar ma'aunin yanke shawara. Wannan adadin kuskuren bit shine mafi kyawu a ka'ida, wato, a ka'idar mafi ƙarancin yuwuwa.
Mafi kyawun ƙimar kuskuren siginar ƙayyadaddun siginar binary an ƙaddara ta hanyar daidaitawa coefficient p da siginar-zuwa amo rabo E/n., amma ba shi da alaƙa kai tsaye tare da siginar waveform. Karamin haɗin haɗin p, ƙananan ƙimar kuskuren bit. Siginar 2PSK tana da mafi ƙarancin haɗin haɗin gwiwa (p=-1) da mafi ƙarancin ɗan kuskure. Ana iya ɗaukar siginar 2FSK azaman siginar orthogonal tare da haɗin haɗin kai p=0.
Don siginar tare da sigina da haɓaka, siginar FSK kawai ake amfani dashi azaman bincike na wakilci, saboda a cikin wannan tashar, girman girman siginar da lokaci na siginar ana canza su ba da gangan ba saboda tasirin amo, don haka siginar FSK ya fi dacewa da aikace-aikacen. Demodulation mara daidaituwa shine mafi kyawun hanyar karɓa saboda bazuwar canjin siginar da tashar ta haifar.
Ta hanyar kwatanta ƙimar kuskuren bit na ainihin mai karɓa da mafi kyawun mai karɓa, ana iya ganin cewa idan siginar-zuwa-amo ikon rabo r a cikin ainihin mai karɓa yana daidai da rabo E / n na lambar makamashi da kuma amo ikon bakan. yawa a cikin mafi kyawun mai karɓa, aikin kuskuren bit na biyu iri ɗaya ne. Duk da haka, saboda ainihin mai karɓa koyaushe ba zai yiwu a cimma wannan batu ba. Saboda haka, aikin ainihin mai karɓa koyaushe yana ƙasa da na mafi kyawun mai karɓa.
Wannan ita ce ShenzhenHDV Pholantarki Technology Ltd. don kawo muku game da "mafi kyawun liyafar dijital sakonni", fatan taimaka muku, da ShenzhenHDV Pholantarki Technology Ltd ban daONUjerin, transceiver jerin,OLTjerin, amma kuma samar da module jerin, kamar: Communication Optical module, Tantancewar sadarwa module, cibiyar sadarwa Tantancewar module, sadarwa Tantancewar module, Tantancewar fiber module, Ethernet Tantancewar fiber module, da dai sauransu, na iya samar da daidai ingancin sabis don daban-daban masu amfani 'bukatun. , barka da zuwan ku.
