免费通信原理课件2对映Haykin四共.pptVIP

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免费通信原理课件2对映Haykin四共.ppt

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免费通信原理课件2对映Haykin四共

Chapter2Continuous-Wave Modulation Figure 2.1Components of a continuous-wave modulation system: (a) transmitter, and (b) receiver. Figure 2.2Illustrating AM and FM signals produced by a single tone. (a) Carrier wave. (b) Sinusoidal modulating signal. (c) Amplitude-modulated signal. (d) Frequency-modulated signal. Figure 2.3Illustrating the amplitude modulation process. (a) Baseband signal m(t). (b) AM wave for | kam(t) | 1 for all t. (c) AM wave for | kam(t) | 1 for some t. Figure 2.4(a) Spectrum of baseband signal. (b) Spectrum of AM wave. Figure 2.5(a) Block diagram of product modulator. (b) Baseband signal. (c) DSB-SC modulated wave. Figure 2.6(a) Spectrum of baseband signal. (b) Spectrum of DSB-SC modulated wave. Figure 2.7Coherent detector for demodulating DSB-SC modulated wave. Figure 2.8Illustrating the spectrum of a product modulator output with a DSB-SC modulated wave as input. Figure 2.9Costas receiver. Figure 2.10Quadrature-carrier multiplexing system. (a) Transmitter. (b) Receiver. Figure 2.11(a) Spectrum of a message signal m(t) with an energy gap of width 2fa centered on the origin. (b) Spectrum of corresponding SSB signal containing the upper sideband. Figure 2.12Filtering scheme for the generation of VSB modulated wave. Figure 2.13Magnitude response of VSB filter; only the positive-frequency portion is shown. Figure 2.14Frequency response of a filter for producing the quadrature component of the VSB modulated wave. Figure 2.15(a) Idealized magnitude spectrum of a transmitted TV signal. (b) Magnitude response of VSB shaping filter in the receiver. Figure 2.16Block diagram of mixer. Figure 2.17(a) Spectrum of modulated signal s1(t) at the mixer input. (b) Spectrum of the corresponding signal s′(t) at the output of the product modulator in the mixer. Figure 2.18Block diagram of FDM system. Figure 2.19Illustrating the modulation steps in an FDM system. Figure 2.20Illustrating the relationship between frequency modulation and p