I loko o kahi ʻōnaehana kamaʻilio kikohoʻe, ʻo ka mea i loaʻa i ka mea hoʻokipa ʻo ia ka huina o ka hōʻailona hoʻouna ʻia a me ke kani kani.
ʻO ka hoʻokipa maikaʻi loa o nā hōʻailona kikohoʻe e pili ana i ka hapa liʻiliʻi o ka hewa e like me ka "best" criterion. ʻO nā hewa i noʻonoʻo ʻia ma kēia mokuna ke kumu nui ʻia e ka leo keʻokeʻo Gaussian palena. Ma lalo o kēia manaʻo, ua māhele ʻia ka hōʻailona binary digital modulated i ʻekolu mau ʻano: ka hōʻailona hōʻoia, ka hōʻailona hilinaʻi a me ka hōʻailona fluctuation, a ʻo ka hapa liʻiliʻi o ka hewa e nānā ʻia i kēlā me kēia. Eia hou, ua kālailai ʻia ka hewa o ka loaʻa ʻana o ka hōʻailona band multi-base.
ʻO ke kumu kumu o ka nānā ʻana, ʻo ia ka lawe ʻana i ka waiwai hōʻailona holoʻokoʻa o kahi mea hōʻailona loaʻa ma ke ʻano he vector i loko o ka K-dimensional loaʻa vector space, a puʻunaue i ka loaʻa vector space i ʻelua mau ʻāpana. E noʻonoʻo inā he hewa paha e like me ka ʻāina i hāʻule ai ka vector i loaʻa. Hiki ke kiʻi ʻia ke kiʻikuhi poloka o ka mea hoʻokipa maikaʻi loa a hiki ke helu ʻia ka nui o ka hapa hapa e ka pae hoʻoholo. ʻO kēia hapa hapa hapa ʻoi loa ka maikaʻi, ʻo ia hoʻi, ʻo ka mea liʻiliʻi loa.
Hoʻoholo ʻia ka helu hapa hapa maikaʻi loa o ka hōʻailona hoʻoholo binary e ka coefficient correlation p a me ka ratio signal-to-noise E/n., akā ʻaʻohe pilina pololei me ka nalu hōʻailona. ʻOi aku ka liʻiliʻi o ka coefficient correlation p, ʻoi aku ka haʻahaʻa o ka hapa hapa iki. Loaʻa i ka hōʻailona 2PSK ka helu hoʻopili liʻiliʻi loa (p=-1) a me ka hapa haʻahaʻa haʻahaʻa. Hiki ke manaʻo ʻia ka hōʻailona 2FSK he hōʻailona orthogonal me ka coefficient correlation p=0.
No ka hōʻailona me ka hōʻailona a me ka fluctuation, hoʻohana wale ʻia ka hōʻailona FSK ma ke ʻano he loiloi ʻelele, no ka mea ma kēia kahawai, hoʻololi ʻia ka amplitude a me ka pae o ka hōʻailona ma muli o ka mana o ka walaʻau, no laila ua kūpono ka hōʻailona FSK no ka noi. ʻO ka demodulation inoherent ke ala loaʻa maikaʻi loa ma muli o ka hoʻololi maʻamau o ka pae hōʻailona i hana ʻia e ke kahawai.
Ma ka hoʻohālikelike ʻana i ka hapa hapa hapa o ka mea hoʻokipa maoli a me ka mea hoʻokipa maikaʻi loa, hiki ke ʻike ʻia inā ʻo ka lākiō mana hōʻailona-a-noise r i ka mea hoʻokipa maoli e like me ka ratio E / n o ka ikehu code a me ka mana leo spectral. ʻoi aku ka nui i ka mea hoʻokipa maikaʻi loa, ʻo ka hana ʻana o ka hapa hapa o nā mea ʻelua. Eia nō naʻe, no ka mea hiki ʻole i ka mea hoʻokipa maoli ke hoʻokō i kēia wahi. No laila, ʻoi aku ka haʻahaʻa o ka hana a ka mea hoʻokipa maoli ma mua o ka mea hoʻokipa maikaʻi loa.
ʻO Shenzhen kēiaHDV ʻO Phoelectron Technology Ltd. e lawe mai iā ʻoe e pili ana i ka "hoʻokipa maikaʻi loa o nā hōʻailona kikohoʻe", manaʻolana e kōkua iā ʻoe, a me ShenzhenHDV ʻO Phoelectron ʻenehana Ltd. ma waho aʻe oONUmoʻo, moʻo transceiver,OLTmoʻo, akā hana pū kekahi moʻo module, e like me: Communication optical module, optical communication module, network optical module, communication optical module, optical fiber module, Ethernet optical fiber module, etc., hiki ke hāʻawi i ka lawelawe kūpono kūpono no nā mea hoʻohana like ʻole. , hoʻokipa i kou kipa ʻana.
