文档介绍:FromWikipedia,thefreeencyclopediaTopofacellularradiotowerA work isa workdistributedoverlandareascalledcells,eachservedbyatleastonefixed-location transceiver knownasa cellsite or (., mobilephones, pagers,etc.)work,viabasestations,:increasedcapacityreducedpoweruselargercoverageareareducedinterferencefromothersignalsAnexampleofasimplenon-telephonecellularsystemisanold taxi driver' [hide]1 Theconcept2 Cellsignalencoding3 Frequencyreuse4 Directionalantennas5 Broadcastmessagesandpaging6 Movementfromcelltocellandhandover7 work:    parisonofdifferentfrequencies8 Seealso9 References[edit]TheconceptExampleoffrequencyreusefactororpattern1/4Ina cellularradio system,alandareatobesuppliedwithradioserviceisdividedintoregularshapedcells,whichcanbehexagonal,square,circularorsomeotherirregularshapes,(f1 - f6)whichhavecorresponding ,providedthatthesamefrequenciesarenotreusedinadjacentneighboringcellsasthatwouldcause co- capacity ,,thereisinevitablysomelevelof interference ,inastandardFDMAsystem,,, frequency ,,wheninvitedbythebas