标签: 2007020802

2007020802[1]signalprocessingTheprinciplesofOFDMMulticarriermodulationtechniquesarerapidlymovingfromthetextbooktotherealworldofmoderncommunicationsystemsByLouisLitwinandMichaelPugeldigitalsignals,theinformationisintheformofbits,orcollectionsofbitscalledsymbols,thataremodulatedontothecarrier.Ashigherbandwidths(datarates)areused,thedurationofonebitorsymbolofinformationbecomessmaller.Thesystembecomesmoresusceptibletolossofinformationfromimpulsenoise,signalreflectionsandotherimpairments.Theseimpairmentscanimpedetheabilitytorecovertheinformationsent.Inaddition,asthebandwidthusedbyasinglecarriersystemincreases,thesusceptibilitytointerferencefromothercontinuoussignalsourcesbecomesgreater.T……