I-RSSI sisishunqulelo seSalathiso soMqondiso oFunyiweyo waMandla.Uphawu lwamandla omqondiso olufunyenweyo lubalwa ngokuthelekisa amaxabiso amabini;oko kukuthi, inokusetyenziswa ukumisela ukuba yomelele okanye ibuthathaka kangakanani na amandla omqondiso xa kuthelekiswa nolunye uphawu.
Ifomula yokubala ye-RSSI yile: 10 * log (W1/W2)
Inombolo yesiseko yelogi yi-10 ngokungagqibekanga, i-W1 imele amandla 1 (ngokubanzi amandla anokulinganiswa), kwaye i-W2 imele amandla 2 (amandla aqhelekileyo).Ukubaluleka kweziphumo sisalathiso sokuba ingakanani i-W1 enkulu okanye encinci kuno-W2.Iyunithi yi-DB, engenakubaluleka okubonakalayo kodwa imele ixabiso elihambelanayo.Inokuqondwa njengomahluko phakathi komlinganiselo we-W1 kunye ne-W2.Eli lixabiso elingabonakaliyo ngaphandle kweyunithi ethile.Ewe, xa uthelekisa i-W1 kunye ne-W2 ziyiyunithi enye, kodwa kungakhathaliseki ukuba yeyiphi iyunithi esetyenziswayo, umahluko phakathi kwabo linani le-DB elifanayo.
Imeko ekhethekileyo:xa i-W2 ingu-1, iyunithi ye-RSSI inokumiselwa ngokweyunithi ye-W2.Ukuba i-W2 yi-1mw, iyunithi ye-RSSI yi-dBm;ukuba i-W2 ngu-1w, iyunithi ye-RSSI yi-dbw.Kulapho i-W2 iyi-1mw okanye i-1w, iyunithi ye-W1 inokutshintshwa ukusuka kwi-MW okanye i-w ukuya kwi-dbm okanye i-dbw.
njengokuba:Ixabiso lokuguqula i-40000 MW yamandla kwi-dBm yi-10 * log (40000/1mw) 46 dBm.
Ke kutheni ukwazisa iDB?
1.Okokuqala, owona msebenzi ucacileyo kukunciphisa ixabiso lokuququzelela ukufunda nokubhala, njengalo mzekelo ulandelayo:
0.000000000000001 = 10*log(10^-15) =-150 dB
2.Kukwakulungele ukubala amaxabiso amancinci: ukuphindaphinda kusetyenziswa kwi-multi-level yokwandisa, ngelixa i-DB isebenzisa ukudibanisa ngenxa yelogi ye-logarithmic.Umzekelo, ukuba usondeza amaxesha angama-100 kwaye usondeza amaxesha angama-20, ulwandiso lulonke ngu-100 * 20 = 2000, kodwa ukubala kwe-DB ngu-10 * log (100) = 20, 10 * log (20) = 13, kwaye ulwandiso lulonke yi-20+13=33db
3.Ichaneke ngakumbi kwimvakalelo yokwenyani.Xa isiseko samandla si-1, 10 * log (11/1) ≈ 10.4db inyuka ukusuka kwi-1 ukuya kwi-10. Xa isiseko si-100, i-10 * log (110/100) ≈ 0.4db yanda.Xa isiseko sitshintsha, ukwandiswa okufanayo ngokupheleleyo kukhula ngeendlela ezahlukeneyo, ezihambelana noko kubonwa ngabantu.
I-RSSI isalathiso samandla ophawu olufunyenweyo.Oko kukuthi, ixabiso elikhulu le-RSSI, amandla amakhulu afunyenweyo.Nangona kunjalo, oko akuthethi ukuba ixabiso elikhulu le-RSSI, lingcono.Kuba kudla ngokuba yimfuneko ukugcina amandla angaka, abaphinda-phindayo bayafuneka embindini, kwaye ixabiso liphezulu.Akuyomfuneko.Ngokubanzi, yi-0~- 70dbm kuphela.
Oku ngasentla yinkcazo yoLwazi oluFunyiweyo lweSignali yaMandla (RSSI) oluziswa yi-Shenzhen HDV Phoelectric Technology Co., Ltd., eyinkampani yokuvelisa unxibelelwano olubonakalayo.Wamkelekile kuweukubuzathina ngeenkonzo ezikumgangatho ophezulu.