ʻO RSSI ka pōkole o ka hōʻailona hōʻailona loaʻa.Hoʻohālikelike ʻia ka hōʻailona ikaika o ka hōʻailona ma ka hoʻohālikelike ʻana i ʻelua mau waiwai;ʻo ia hoʻi, hiki ke hoʻohana ʻia e hoʻoholo i ka ikaika a i ʻole nāwaliwali o ka ikaika hōʻailona e hoʻohālikelike ʻia me kahi hōʻailona ʻē aʻe.
ʻO ke kumu helu helu RSSI: 10 * log (W1/W2)
ʻO ka helu kumu o ka log he 10 ma ke ʻano maʻamau, ʻo W1 ka mana 1 (maʻamau ka mana e ana ʻia), a ʻo W2 ka mana 2 (mana maʻamau).ʻO ke koʻikoʻi o nā hopena he hōʻailona ia o ka nui a i ʻole ka liʻiliʻi o W1 ma mua o W2.ʻO ka ʻāpana ʻo DB, ʻaʻohe ona koʻikoʻi kūpono akā hōʻike i kahi waiwai pili.Hiki ke hoʻomaopopo ʻia ʻo ia ka ʻokoʻa ma waena o ka ratio o W1 a me W2.He waiwai abstract kēia me ka ʻole o kahi ʻāpana kikoʻī.ʻOiaʻiʻo, i ka hoʻohālikelike ʻana iā W1 a me W2 o ka ʻāpana like, akā ʻaʻohe mea i hoʻohana ʻia, ʻo ka ʻokoʻa ma waena o lākou ka helu DB like.
hihia kūikawā:inā he 1 ka W2, hiki ke hoʻoholo ʻia ka wae o RSSI e like me ka wae o W2.Inā he 1mw ka W2, he dBm ka wae o RSSI;inā he 1w ka W2, he dbw ka wae o RSSI.ʻO ia ka W2 he 1mw a i ʻole 1w, hiki ke hoʻololi ʻia ka ʻāpana o W1 mai MW a i ʻole w i dbm a i ʻole dbw.
ʻo kahi laʻana:ʻO ka waiwai o ka hoʻololi ʻana i 40000 MW o ka mana i dBm he 10 * log (40000/1mw) 46 dBm.
No laila no ke aha e hoʻokomo ai iā DB?
1.ʻO ka mea mua, ʻo ka hana ʻoi loa ka hoʻemi ʻana i ka waiwai e hoʻomaʻamaʻa i ka heluhelu a me ke kākau ʻana, e like me kēia laʻana:
0.000000000000001 = 10*log(10^-15) =-150 dB
2.Maikaʻi nō hoʻi ka helu ʻana i nā waiwai liʻiliʻi: hoʻohana ʻia ka hoʻonui ʻana i ka hoʻonui ʻana i nā pae he nui, ʻoiai hoʻohana ʻo DB i ka hoʻohui ma muli o ka logarithmic log.No ka laʻana, inā hoʻonui ʻoe i 100 mau manawa a laila hoʻonui i 20 mau manawa, ʻo ka nui o ka hoʻonui ʻana he 100 * 20 = 2000, akā ʻo ka helu ʻana o DB he 10 * log (100) = 20, 10 * log (20) = 13, a ʻo ka huina hoonui he 20+13=33db
3.ʻOi aku ka pololei no ka manaʻo maoli.Ke 1 ka waihona mana, 10 * log (11/1) ≈ 10.4db piʻi mai ka 1 a hiki i 10. Ke hoʻonui ʻia ke kumu 100, 10 * log (110/100) ≈ 0.4db piʻi.Ke hoʻololi ke kumu, ulu ka hoʻonui piha like ʻole i nā ʻano like ʻole, e like me ka mea i ʻike maoli ʻia e ka poʻe.
ʻO RSSI kahi hōʻailona o ka ikaika hōʻailona i loaʻa.ʻO ia hoʻi, ʻoi aku ka nui o ka waiwai RSSI, ʻoi aku ka nui o ka ikaika hōʻailona i loaʻa.Akā naʻe, ʻaʻole ia he manaʻo ʻoi aku ka nui o ka waiwai RSSI, ʻoi aku ka maikaʻi.No ka mea he mea pono e mālama i kēlā mana nui, pono nā mea hou hou i ka waena, a he kiʻekiʻe ke kumukūʻai.ʻAʻole pono.ʻO ka maʻamau, ʻo 0 ~ - 70dbm wale nō.
ʻO ka mea i luna nei ka wehewehe ʻana o ka ʻike Received Signal Strength Indication (RSSI) i lawe ʻia e Shenzhen HDV Phoelectric Technology Co., Ltd., he ʻoihana hana kamaʻilio optical.Welina mai iā ʻoeninauiā mākou no nā lawelawe kūlana kiʻekiʻe.