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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. In most Systems ,there is a high priority on bandwidth efficiency. The parameter to be optimized depends on the demands of the particular system , as can be seen in the following two designers of Digital terrestrial microwave radios, their highest priorityis good bandwidth efficiency with low bit-error-rate. They have plenty ofpower available and are not concerned with power efficiency.
3.5 Quadrature Amplitude Modulation (QAM) 3.6 Theoretical bandwidth efficiency limits 3.7 Spectral efficiency examples in practical radios 3.8 I/Q offset modulation 3.9 Differential modulation 3.10 Constant amplitude modulation 4. Filtering 4.1 Nyquist or raised cosine filter 4.2 Transmitter-receiver matched filters 4.3 Gaussian filter
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