Ma ka ʻōnaehana kamaʻilio kikohoʻe, loaʻa i ka mea hoʻokipa ka huina o ka hōʻailona i hoʻouna ʻia a me ka walaʻau kani.
ʻO kahookipa maikai loao nā hōʻailona kikohoʻe e pili ana i ka hōʻailona "maikaʻi" me ka liʻiliʻi liʻiliʻi o ka hewa. ʻO nā hewa i noʻonoʻo ʻia ma kēia mokuna ma muli o ka leo Gaussian keʻokeʻo palena palena. Ma lalo o kēia manaʻo, ua māhele ʻia ka hōʻailona modulated digital binary i ʻekolu ʻano: hōʻailona definite, hōʻailona pili i ka pae, a me ka hōʻailona fluctuating. Hoʻopili ʻia ka hapa liʻiliʻi o ke kuhi hewa. Eia hou, ua kālailai ʻia ka hemahema o ka loaʻa ʻana o nā hōʻailona baseband multilevel.
ʻO kakumu kumu o ka anaanaʻo ia ka nānā ʻana i nā kumu waiwai a pau o kahi hōʻailona hōʻailona i loaʻa ma ke ʻano he vector i loko o ka k-dimensional i loaʻa vector space a puʻunaue i ka ʻāpana vector i loaʻa i ʻelua mau ʻāpana. Hoʻoholo ʻia inā he hewa a ʻaʻole paha e like me ka ʻāina i hāʻule ai ka vector i loaʻa. Hiki ke kiʻi ʻia ke kiʻikuhi poloka kumu o ka mea hoʻokipa maikaʻi loa a hiki ke helu ʻia ka hapa hapa iki e ka ʻōlelo hoʻoholo. ʻOi aku ka maikaʻi loa o kēia hapa hapa hapa—ʻo ia hoʻi, ʻo ka liʻiliʻi loa i hiki.
ʻO kahapa hapa maikaʻi loaHoʻoholo ʻia ka helu o ka hōʻailona hoʻoholo binary e ka coefficient correlation p o nā hōʻailona ʻelua a me ka ratio hōʻailona-i-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. ʻO ka coefficient correlation o ka hōʻailona 2PSK ka mea liʻiliʻi loa (p = -1), a ʻo ka haʻahaʻa haʻahaʻa loa. Hiki ke ʻike ʻia ka hōʻailona 2FSK ma ke ʻano he hōʻailona quadrature a ʻo kāna coefficient correlation he p = 0.
No kahōʻailona hahai ʻāpanaa me ka hoailona fluctuating, wale no kahōʻailona FSKHoʻohana ʻia ʻo ia ka ʻelele no ka nānā ʻana, no ka mea ma kēia kahawai, hoʻololi 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. Ma muli o ka hoʻololi ʻana o ke kahawai i ka pae hōʻailona, ʻaʻole hiki ke hoʻohana i ka demodulation coherent. Akā, ʻo ka demodulation non-coherent ke ala maikaʻi loa e loaʻa ai ka hōʻailona.
Hoʻohālikelike ʻia me nā hapa hapa hapa o ka mea hoʻokipa maoli a me kamea hoʻokipa maikaʻi loa, Ua hiki ke ike ina ka hoailona-a-noise mana lākiō r i loko o ka mea loaʻa maoli ua like ia me ka lākiō o ka ikehu hōʻailona i ka mana walaʻau spectral density i loko o ka maikaʻi loa receiver E / n, ka hapa hapa helu hana o ka. ʻelua like. Eia naʻe, ʻaʻole hiki ke hana i kēia ma muli o nā mea hoʻokipa maoli. No laila, ʻoi aku ka maikaʻi o ka hana a ka mea hoʻokipa maoli ma mua o ka hana a ka mea hoʻokipa maikaʻi loa.
ʻO kēia ka Shenzhen HDV Phoelectron Technology Co., Ltd. iā ʻoe. lawe mai iā ʻoe e pili ana i ka "The Best Reception of Digital Signals". Manaʻo wau e kōkua kēia ʻatikala iā ʻoe e hoʻonui i kou ʻike. Ma waho aʻe o kēia ʻatikala inā ʻoe e ʻimi nei i kahi ʻoihana mea hana uila fiber optical maikaʻi āu e noʻonoʻo aie pili ana iā mākou.
Shenzhen HDV photoelectric Technology Co., Ltd.ʻo ia ka mea hana nui i nā huahana kamaʻilio. I kēia manawa, uhi nā mea hana i hana ʻia i kamoʻo ONU, moʻo module optical, OLT moʻo, amoʻo transceiver. Hiki iā mākou ke hāʻawi i nā lawelawe kūikawā no nā hiʻohiʻona like ʻole. Aloha oekukakuka.
