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Digital Modulation in Communications Systems – An …

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.

2.3 Polar display - magnitude and phase represented together A simple way to view amplitude and phase is with the polar diagram. The carrier becomes a frequency and phase reference and the signal is interpreted relative to the carrier. The signal can be expressed in polar form as a magnitude and a phase.

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