6COMMS-Faculty of Computing, Engineering & Technology

May 1st, 2015
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Why is modulation is needed? What is modulation? Digital modulation & demodulation techniques Obtain SNR of system by: Signal Power; Noise Power

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6COMMSFaculty of Computing,Engineering & TechnologyDigital modulation:ASK, FSK, PSKCommunicationsCOMMS (CE700038-2)Alison L CarringtonC203A.L.Carrington@staffs.ac.ukwww.fcet.staffs.ac.uk/alg12008/9Digital modulation:ASK, FSK, PSK2OverviewWhy is modulation is needed?What is modulation?Digital modulation & demodulation techniquesObtain SNR of system by:Signal PowerNoise PowerDetermine the performance of different DigitalMod/Demod techniques with different amountsof noiseCOMMS (CE700038-2) 2008/93IntroductionDigital modulation:ASK, FSK, PSKOften send information in a digital formAs binary words, bits represented by 1s & 0sCould be from a keyboard, characters encoded as1s & 0sOr a microphone (speech)Or a temperature sensorconverted to binary form by A/D converter.Why do we need to modulate?COMMS (CE700038-2) 2008/9Digital modulation:ASK, FSK, PSK4Why modulate?The purpose of a communication system is totransfer information from a source to adestinationProblems arise in baseband transmissions:Noiseexternal & circuit noise reduces the signal-to-noise (S/N)ratio at the receiver, (Rx) reducing the quality of theoutput.Not able to fully utilise the available bandwidth:telephone quality speech has a bandwidth 3kHzco-axial cable has a bandwidth of 100's of Mhz.COMMS (CE700038-2) 2008/95What is Modulation? #1Digital modulation:ASK, FSK, PSKA message signal containing information is u

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