Transcription of Modulation Techniques - ntuemc.tw
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Modulation Techniques - ntuemc.tw
Prof. Tzong-Lin WuEMC LaboratoryDepartment of Electrical EngineeringNational Taiwan University2011/2/21 Modulation Techniques1MW & RF Design / Prof. T. -L. Wu2011/2/21 Analog Modulation : AM, FM and PM. Modern wireless systems use digital Modulation . More spectrum efficient, less power required and error correction Better immunity to fading. Study the effect of noise of digital Modulation , the Modulation and & RF Design / Prof. T. -L. Wu2011/2 Analog modulation3MW & RF Design / Prof. T. -L. WuBecause the IF signal in a receiver contains noise from the antenna and receiver circuitry, as well as the desired signal, the characteristics of the demodulator play a critical role in the overall performance of the wireless modulation4MW & RF Design / Prof. T. -L. WuThe upper sideband is selected from the mixer output with a bandpassfilter, although the lower sideband could be selected, if that the demodulator LO is identical in frequency and phase with the modulatorLO; this is called a synchronous, or coherent, & RF Design / Prof.
Prof. Tzong-Lin Wu EMC Laboratory Department of Electrical Engineering National Taiwan University 2011/2/21 Modulation Techniques MW & RF Design / Prof. T. -L. Wu 1
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