RSSI ita ce taƙaitaccen nunin Ƙarfin Sigin da aka Karɓa. Ƙarfin siginar da aka karɓa ana ƙididdige shi ta hanyar kwatanta dabi'u biyu; wato, ana iya amfani da shi don sanin yadda ƙarfin siginar ya kasance mai ƙarfi ko rauni da wani sigina.
Tsarin lissafin RSSI shine: 10 * log (W1/W2)
Lambar tushe na log ɗin shine 10 ta tsohuwa, W1 yana wakiltar ikon 1 (gaba ɗaya ikon da za a auna), kuma W2 yana wakiltar iko 2 (madaidaicin iko). Muhimmancin sakamakon shine mai nuna yawan W1 ya fi girma ko karami fiye da W2. Naúrar ita ce DB, wacce ba ta da ma'ana mai amfani amma tana wakiltar ƙimar dangi. Ana iya fahimtar shi azaman bambanci tsakanin rabon W1 da W2. Wannan ƙima ce mai ƙima ba tare da takamaiman naúrar ba. Tabbas, idan aka kwatanta W1 da W2 raka'a ɗaya ce, amma ko wace naúrar za a yi amfani da su, bambancin su shine lambar DB ɗaya.
Hali na musamman:lokacin da W2 ya kasance 1, ana iya ƙayyade naúrar RSSI bisa ga naúrar W2. Idan W2 shine 1mw, sashin RSSI shine dBm; idan W2 shine 1w, sashin RSSI shine dbw. Wato lokacin da W2 ke 1mw ko 1w, ana iya canza naúrar W1 daga MW ko w zuwa dbm ko dbw.
misali:Darajar juya 40000MW na wuta zuwa dBm shine 10 * log (40000/1mw) 46 dBm.
Don haka me yasa gabatar da DB?
1.Da farko dai, aikin da ya fi fitowa fili shi ne rage kima don saukaka karatu da rubutu, kamar misali mai zuwa:
0.00000000000001 = 10* log(10^-15) = -150dB
2.Hakanan yana da dacewa don ƙididdige ƙananan ƙididdiga: ana amfani da haɓakawa a cikin haɓakawa da yawa, yayin da DB yana amfani da ƙari saboda logarithmic log. Misali, idan ka yi zuƙowa sau 100 sannan ka zuƙowa sau 20, jimlar girman girman shine 100 * 20 = 2000, amma lissafin DB shine 10 * log (100) = 20, 10 * log (20) = 13. kuma jimlar girma shine 20+13=33db
3.Ya fi daidai ga ainihin ji. Lokacin da tushen wutar lantarki shine 1, 10 * log (11/1) ≈ 10.4db yana ƙaruwa daga 1 zuwa 10. Lokacin da tushe ya kasance 100, 10 * log (110/100) ≈ 0.4db yana ƙaruwa. Lokacin da tushe ya canza, daidaitaccen haɓaka yana girma ta hanyoyi daban-daban, wanda yayi daidai da abin da mutane ke gani a zahiri.
RSSI alama ce ta ƙarfin sigina da aka karɓa. Wato, mafi girman ƙimar RSSI, mafi girman ƙarfin siginar da aka karɓa. Duk da haka, ba yana nufin cewa mafi girman ƙimar RSSI ba, mafi kyau. Domin sau da yawa ya zama dole don kula da irin wannan babban iko, ana buƙatar ƙarin maimaitawa a tsakiya, kuma farashin yana da yawa. Ba lallai ba ne. Gabaɗaya, 0 ~ - 70dbm ne kawai.
Abin da ke sama shine bayanin Ilimin Ƙarfin Siginar Ƙarfi (RSSI) wanda Shenzhen HDV Phoelectric Technology Co., Ltd. ya kawo, wanda kamfani ne na kera sadarwa na gani. Barka da zuwatambayamu don ayyuka masu inganci.