Transcription of Digital Modulation in Communications Systems – An …
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Digital Modulation inCommunications Systems An IntroductionApplication Note 1298 This application note introduces the concepts of Digital Modulation used inmany Communications Systems today. Emphasis is placed on explaining the tradeoffs that are made to optimize efficiencies in system Communications Systems fall into one of three categories: bandwidthefficient, power efficient, or cost efficient. Bandwidth efficiency describesthe ability of a Modulation scheme to accommodate data within a limitedbandwidth. Power efficiency describes the ability of the system to reliablysend information at the lowest practical power level.
2.6 I and Q in a radio transmitter I/Q diagrams are particularly useful because they mirror the way most digital communications signals are created using an I/Q modulator. In the transmitter, I and Q signals are mixed with the same local oscillator (LO). A 90 degree phase shifter is placed in one of the LO paths. Signals that are
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