I-RSSI isifinyezo se-Received Signal Strength Indication. Isici samandla esignali esamukelwe sibalwa ngokuqhathanisa amanani amabili; okungukuthi, ingasetshenziswa ukunquma ukuthi amandla esiginali aqine noma abuthakathaka kangakanani uma eqhathaniswa nenye isignali.
Ifomula yokubala ye-RSSI ithi: 10 * log (W1/W2)
Inombolo eyisisekelo yelogi ingu-10 ngokuzenzakalelayo, i-W1 imele amandla angu-1 (ngokuvamile amandla azolinganiswa), futhi i-W2 imele amandla 2 (amandla avamile). Ukubaluleka kwemiphumela kuyinkomba yokuthi i-W1 inkulu noma incane kangakanani kuno-W2. Iyunithi iyi-DB, engenakho ukubaluleka okungokoqobo kodwa emele inani elihlobene. Kungaqondwa njengomehluko phakathi kwesilinganiso se-W1 ne-W2. Leli inani elingabonakali ngaphandle kweyunithi ethile. Yiqiniso, uma uqhathanisa i-W1 ne-W2 yiyunithi efanayo, kodwa kungakhathaliseki ukuthi iyiphi iyunithi esetshenziswayo, umehluko phakathi kwabo inombolo efanayo ye-DB.
Icala elikhethekile:uma i-W2 ingu-1, iyunithi ye-RSSI inganqunywa ngokuya ngeyunithi ye-W2. Uma i-W2 ingu-1mw, iyunithi ye-RSSI ingu-dBm; uma i-W2 ingu-1w, iyunithi ye-RSSI ingu-dbw. Kulapho i-W2 ingu-1mw noma u-1w, iyunithi ye-W1 ingashintshwa isuke ku-MW noma i-w iye ku-dbm noma i-dbw.
Ngokwesibonelo:Inani lokuguqula u-40000 MW wamandla abe yi-dBm ngu-10 * log (40000/1mw) 46 dBm.
Pho kungani wethula i-DB?
1.Okokuqala, umsebenzi osobala kakhulu ukunciphisa inani ukuze kube lula ukufunda nokubhala, njengesibonelo esilandelayo:
0.000000000000001 = 10*log(10^-15) =-150 dB
2.Kuyasiza futhi ukubala amanani amancane: ukuphindaphinda kusetshenziswa ekukhuliseni amazinga amaningi, kuyilapho i-DB isebenzisa ukuhlanganisa ngenxa yelogi ye-logarithmic. Isibonelo, uma usondeza izikhathi ezingu-100 bese usondeza izikhathi ezingu-20, isamba sokukhulisa singu-100 * 20 = 2000, kodwa ukubala kwe-DB ngu-10 * log (100) = 20, 10 * log (20) = 13, futhi isamba sokukhulisa singu-20+13=33db
3.Inembe kakhulu ngomuzwa wangempela. Uma isisekelo samandla singu-1, 10 * log (11/1) ≈ 10.4db inyuka isuka ku-1 iye ku-10. Uma isisekelo singu-100, 10 * log (110/100) ≈ 0.4db iyanda. Lapho isisekelo sishintsha, ukukhuphuka okufanayo okuphelele kukhula ngezindlela ezahlukene, okufana nalokho abantu abakubonayo ngempela.
I-RSSI inkomba yamandla esignali atholiwe. Okusho ukuthi, inani elikhulu le-RSSI, likhulu amandla esignali atholiwe. Nokho, akusho ukuthi uma likhulu inani le-RSSI, lingcono. Ngenxa yokuthi ngokuvamile kuyadingeka ukugcina amandla amakhulu kangaka, abaphindayo abaningi bayadingeka phakathi, futhi izindleko ziphezulu. Akudingekile. Ngokuvamile, kungu-0~-70dbm kuphela.
Okungenhla incazelo Yolwazi Olutholiwe Lwesibonakaliso Samandla Esiginali (RSSI) elethwa i-Shenzhen HDV Phoelectric Technology Co., Ltd., okuyinkampani ekhiqiza ukuxhumana okubonakalayo. Siyakwamukela kuuphenyous ngezinkonzo ezisezingeni eliphezulu.