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Topic 7: Random Processes

Topic7: RandomProcesses De nition,discreteandcontinuousprocesses Specifyingrandomprocesses{Joint cdf's or pdf's{Mean,auto-covariance,auto-correlat ion{Cross-covariance,cross-correlation StationaryprocessesandergodicityES150{ Harvard SEAS1 Randomprocesses Arandomprocess, alsocalledastochasticprocess, is a familyof randomvariables,indexedby a parametertfromanindexingsetT. For eachexperiment outcome!2 ,we assigna functionXthatdependsontX(t; !)t2T; !2 {tis typicallytime,butcanalsobe a spatialdimension{tcanbe discreteor continuous{Therangeoftcanbe nite,butmoreoftenis in nite,which meanstheprocesscontainsanin nitenumber of randomvariables. Examples:{Thewirelesssignalreceivedby a cellphoneover time{Thedailystock price{Thenumber of packetsarrivingat a routerin 1-secondintervals{Theimageintensity over 1cm2regionsES150{ Harvard SEAS2 We areinterestedin specifyingthejoint behaviorof therandomvariableswithina family, or thebehaviorof a studying{Thedependenciesamongtherandomva riablesof theprocess( ){Long-termaverages{Extremeor boundaryevents ( ){Estimation/detectionof a signalcorruptedby noiseES150{ Harvard SEAS3 Two ways of viewinga randomprocessConsidera processX(t; !)}}}}}}}}}}}}}}}}}

Multiple random processes: Cross-covariance and cross-correlation functions For multiple random processes: † Their joint behavior is completely specifled by the joint distributions for all combinations of their time samples. Some simpler functions can be used to partially specify the joint behavior. Consider two random processes X(t) and Y(t).

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  Processes, Random, Random processes

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