Transcription of Principles of Digital Modulation - Berk
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Principles of Digital Modulation - Berk
1 Principles of Digital ModulationDr Mike Research LabToshiba Research Europe Limited2 Principles of Digital Modulation : Outline of LectureslIntroduction to Digital modulationlRelevant Modulation Schemes ( qpsk , GMSK, M-Ary Schemes)lCoherent and Differential ReceptionlThe impact of the mobile channel on Digital Modulation noise and interference random FM (narrowband fading) intersymbolinterference (wideband fading)3 Digital ModulationBasics4 Digital Modulation BasicslThe bit rate defines the rate at which information is passed. lThe baud (or signalling)ratedefines the number of symbols per second. Each symbol represents nbits, and has Msignal states, where M = 2n. This is called maximum rate of information transfer through a baseband channel is given by: Capacityfb= 2 W log2M bits per second where W = bandwidth of modulating baseband signal5 Amplitude Shift Keying (ASK)lPulse shaping can be employed to remove spectral demonstrates poor performance, as it is heavily affected by noise and modulatedsignalAcos ctAcos ct006 Frequency Shift Keying (FSK)lBandwidth occupancy of FSK is dependant on the spacing of the two symbols.
9 Modulation - QPSK lQuadrature Phase Shift Keying is effectively two independent BPSK systems (I and Q), and therefore exhibits the same performance but twice the ...
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