RSSI ndiye chidule cha Received Signal Strength Indication. Chidziwitso champhamvu champhamvu cholandilidwa chimawerengedwa poyerekezera zikhalidwe ziwiri; ndiko kuti, angagwiritsidwe ntchito kudziwa kuti mphamvu ya siginecha yamphamvu kapena yofooka bwanji poyerekeza ndi chizindikiro china.
Njira yowerengera ya RSSI ndi: 10 * chipika (W1/W2)
Nambala yoyambira ya chipikacho ndi 10 mwachisawawa, W1 imayimira mphamvu 1 (nthawi zambiri mphamvu yoyezedwa), ndipo W2 imayimira mphamvu 2 (mphamvu yokhazikika). Kufunika kwa zotsatira ndi chizindikiro cha kuchuluka kwa W1 kukulirapo kapena kucheperako kuposa W2. Chigawochi ndi DB, chomwe chilibe tanthauzo lenileni koma chimayimira mtengo wachibale. Zitha kumveka ngati kusiyana pakati pa chiŵerengero cha W1 ndi W2. Uwu ndi mtengo wosadziwika wopanda gawo linalake. Zoonadi, poyerekezera W1 ndi W2 ndizofanana, koma ziribe kanthu zomwe zimagwiritsidwa ntchito, kusiyana pakati pawo ndi nambala yofanana ya DB.
Nkhani yapadera:pamene W2 ndi 1, gawo la RSSI likhoza kutsimikiziridwa molingana ndi gawo la W2. Ngati W2 ndi 1mw, gawo la RSSI ndi dBm; ngati W2 ndi 1w, gawo la RSSI ndi dbw. Ndi pamene W2 ndi 1mw kapena 1w, gawo la W1 likhoza kusinthidwa kuchoka ku MW kapena w kupita ku dbm kapena dbw.
Mwachitsanzo:Mtengo wosinthira 40000 MW wa mphamvu kukhala dBm ndi 10 * log (40000/1mw) 46 dBm.
Ndiye bwanji kuyambitsa DB?
1.Choyamba, ntchito yodziwika bwino ndikuchepetsa mtengo wotsogolera kuwerenga ndi kulemba, monga chitsanzo chotsatirachi:
0.000000000000001 = 10* chipika(10^-15) =-150 dB
2.Ndikosavuta kuwerengera ziwerengero zazing'ono: kuchulukitsa kumagwiritsidwa ntchito pakukulitsa magawo angapo, pomwe DB imagwiritsa ntchito kuwonjezera chifukwa cha chipika cha logarithmic. Mwachitsanzo, ngati mukulitsa nthawi 100 ndikuwonera nthawi 20, kukula kwathunthu ndi 100 * 20 = 2000, koma kuwerengera kwa DB ndi 10 * log (100) = 20, 10 * log (20) = 13, ndipo kukula konse ndi 20+13=33db
3.Ndizolondola kwambiri pakumverera kwenikweni. Pamene maziko a mphamvu ndi 1, 10 * chipika (11/1) ≈ 10.4db amawonjezeka kuchokera 1 mpaka 10. Pamene maziko ndi 100, 10 * chipika (110/100) ≈ 0.4db amawonjezeka. Pamene maziko asintha, kuwonjezereka kofananako kumakula m'njira zosiyanasiyana, zomwe zimagwirizana ndi zomwe anthu amawona.
RSSI ndi chizindikiro cha mphamvu zolandirira. Ndiko kunena kuti, kuchuluka kwa RSSI, ndikokulirapo kwa mphamvu yolandila. Komabe, sizikutanthauza kuti kuchuluka kwa RSSI kumakhala bwino. Chifukwa nthawi zambiri zimakhala zofunikira kusunga mphamvu zazikuluzikuluzi, obwerezabwereza amafunikira pakati, ndipo mtengo wake ndi wokwera. Ndizosafunikira. Nthawi zambiri, ndi 0 ~ - 70dbm yokha.
Zomwe zili pamwambazi ndi kufotokozera kwa chidziwitso cha Received Signal Strength Indication (RSSI) chomwe chinabweretsedwa ndi Shenzhen HDV Phoelectric Technology Co., Ltd., yomwe ndi kampani yopanga mauthenga opangira mauthenga. Takulandirani kukufunsaife pa ntchito zapamwamba.