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 1 (ngokuvamile amandla azokalwa), 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) elethwe yi-Shenzhen HDV Phoelectric Technology Co., Ltd., okuyinkampani ekhiqiza ukuxhumana okubonakalayo.Siyakwamukela kuuphenyous ngezinkonzo ezisezingeni eliphezulu.