Ko te RSSI te whakapototanga o te Tohu Tohu Tohu Kua whiwhi. Ko te tohu tohu tohu tohu ka tatauhia ma te whakataurite i nga uara e rua; ara, ka taea te whakamahi ki te whakatau he pehea te kaha, te ngoikore ranei o te kaha tohu ka whakatauritea ki tetahi atu tohu.
Ko te tātai tātai o RSSI ko: 10 * rangitaki (W1/W2)
Ko te tau turanga o te rangitaki he 10 na te taunoa, ko W1 te tohu mana 1 (te nuinga o te mana hei ine), ko W2 te tohu mana 2 (te mana paerewa). Ko te hiranga o nga hua he tohu mo te nui o te W1, te iti ake ranei i te W2. Ko te waeine ko DB, kaore he hiranga mahi engari e tohu ana i te uara whanaunga. Ka taea te mohio ko te rereketanga i waenga i te ōwehenga o W1 me W2. He uara waitara kaore he wae motuhake. Ko te tikanga, ina whakatairitehia te W1 me te W2 o te waeine kotahi, engari ahakoa he aha te waeine e whakamahia ana, ko te rereketanga i waenga i a raatau he tau DB kotahi.
Take motuhake:ina he 1 te W2, ka taea te whakatau i te waeine RSSI i runga i te waeine o W2. Mena he 1mw te W2, he dBm te waeine o RSSI; Mena he 1w te W2, he dbw te waeine o RSSI. Inaa he 1mw, 1w ranei a W2, ka taea te whakarereke i te waeine o W1 mai i te MW, i te w ranei ki te dbm, ki te dbw ranei.
hei tauira:Ko te uara o te huri i te 40000 MW o te mana ki te dBm he 10 * log (40000/1mw) 46 dBm.
Na he aha te whakauru i te DB?
1.Tuatahi, ko te mahi tino kitea ko te whakaheke i te uara kia pai ai te panui me te tuhi, penei i te tauira e whai ake nei:
0.000000000000001 = 10*rakau(10^-15) =-150 dB
2.He watea hoki ki te tatau i nga uara iti: ka whakamahia te whakareatanga i roto i te whakanui taumata-maha, i te wa e whakamahi ana a DB i te taapiri na runga i te raarangi arorau. Hei tauira, ki te topa 100 nga wa ka topa atu kia 20 nga wa, ko te tapeke o te whakanui ko te 100 * 20 = 2000, engari ko te tatauranga o te DB he 10 * rangitaki (100) = 20, 10 * rangitaki (20) = 13, a ko te tapeke o te whakanui he 20+13=33db
3.He tika ake mo te tino kare. A, no te 1 te turanga mana, 10 * log (11/1) ≈ 10.4db ka piki mai i te 1 ki te 10. Ina 100 te turanga, 10 * log (110/100) ≈ 0.4db ka piki. Ka huri te turanga, ka tipu te pikinga tino rite ki nga huarahi rereke, e rite ana ki nga mea e kitea ana e te tangata.
Ko te RSSI he tohu mo te kaha tohu kua riro. Arā, ka nui ake te uara RSSI, ka nui ake te kaha o te tohu kua whakawhiwhia. Heoi, ehara i te mea ka nui ake te uara RSSI, ka pai ake. Na te mea he maha nga wa e tika ana kia mau tonu taua mana nui, me nui ake nga kaitoro i waenganui, he nui te utu. Kare e tika ana. Ko te tikanga, ko te 0~- 70dbm anake.
Ko runga ake nei ko te whakamaramatanga o te matauranga Tohu Tohu Tohu (RSSI) i kawea mai e Shenzhen HDV Phoelectric Technology Co., Ltd., he kamupene hanga korero whatu. Nau mai haere maipakirehuamatou mo nga ratonga kounga teitei.