资源描述:
《Compressed Illunination Sensing》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、IEEESIGNALPROCESSINGLETTERS,VOL.18,NO.10,OCTOBER2011587CompressedIlluminationSensingSandeepGogineni,StudentMember,IEEE,andAryeNehorai,Fellow,IEEEAbstract—Moderndaylightemittingdiodes(LEDs)areca-pableofproducinghighintensitylightacrossawidespreadoffrequencies.Hence,theyarebecomingacommoningredientin
2、manylightingsystems.Inordertoobtaindesiredlightingeffectsefficiently,itisimportanttosensethelightreceivedacrossdifferenttargetlocationsandestimatetheunknownproperties(amplitudes,frequencyoffsetsandphases)ofthemodulatingsignals.ThisfacilitatesthedesignofthedrivingwaveformsfortheLEDs.Thisprocedureiskn
3、ownasilluminationsensinganditenablesefficientandeffectiveusageoflightenergytoachievetheintendedeffects.Weproposeanoveltwostepapproachtoperformthisestimationusingsparsemodelingwhichexploitsthefactthatthemeasurementsatthesensorsaresparseinthefrequencyoffsetspaceandthephasespace.Further,weemploycompres
4、sivesensingtoreducethedimensionsofthemeasurementvector,therebyreducingthecomplexityoftheestimationalgorithm.Thiswillenablequickestimationwhichisessentialtoavoidanylaginattainingthedesiredilluminationeffects.Also,wedemonstratetheperformanceoftheproposedapproachinthepresenceofamodelingmismatch.Fig.1.
5、LEDilluminatingsystemwithsensingattargetlocations.IndexTerms—Compressivesensing,illuminationsensing,LED,sparsity.Ateverytargetlocation,theproductoftheamplitudeanddutycycledeterminestheilluminationlevel.Therefore,toat-I.INTRODUCTIONtainthedesiredilluminationlevels,thetransmittedamplitudeODERNdayLEDs
6、arecapableofproducinghighanddutycycleneedtobecontrolled.However,theamplitudeMintensitylight[1],[2]acrossawidespreadoffrequen-ofthetransmittedpulse(luminousflux)usuallyremainscon-cies.Hence,theyarebecomingacommoningredientinmanystantinpractice.Hence,thecontrollerhastochoosethedutylightingsystems.Itis
7、importanttosensethelightreceivedcycleforeachLEDtoobtainadesiredilluminationeffect.Toacrossdifferenttargetlocationsintheenvironmentandusethisdesignthedutycyclesofthewaveforms,theLEDsinitializetheinformationt