Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Chapter2 Continuous-Wave Modulation.

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Presentation transcript:

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Chapter2 Continuous-Wave Modulation

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.1 Components of a continuous-wave modulation system: (a) transmitter, and (b) receiver.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.2 Illustrating AM and FM signals produced by a single tone. (a) Carrier wave. (b) Sinusoidal modulating signal. (c) Amplitude- modulated signal. (d) Frequency- modulated signal.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.3 Illustrating the amplitude modulation process. (a) Baseband signal m(t). (b) AM wave for | k a m(t) | 1 for some t.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.4 (a) Spectrum of baseband signal. (b) Spectrum of AM wave.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.5 (a) Block diagram of product modulator. (b) Baseband signal. (c) DSB-SC modulated wave.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.6 (a) Spectrum of baseband signal. (b) Spectrum of DSB-SC modulated wave.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.7 Coherent detector for demodulating DSB- SC modulated wave.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.8 Illustrating the spectrum of a product modulator output with a DSB-SC modulated wave as input.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.9 Costas receiver.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.10 Quadrature-carrier multiplexing system. (a) Transmitter. (b) Receiver.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.11 (a) Spectrum of a message signal m(t) with an energy gap of width 2f a centered on the origin. (b) Spectrum of corresponding SSB signal containing the upper sideband.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.12 Filtering scheme for the generation of VSB modulated wave.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.13 Magnitude response of VSB filter; only the positive-frequency portion is shown.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.14 Frequency response of a filter for producing the quadrature component of the VSB modulated wave.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.15 (a) Idealized magnitude spectrum of a transmitted TV signal. (b) Magnitude response of VSB shaping filter in the receiver.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.16 Block diagram of mixer.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.17 (a) Spectrum of modulated signal s 1 (t) at the mixer input. (b) Spectrum of the corresponding signal s´(t) at the output of the product modulator in the mixer.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.18 Block diagram of FDM system.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.19 Illustrating the modulation steps in an FDM system.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.20 Illustrating the relationship between frequency modulation and phase modulation. (a) Scheme for generating an FM wave by using a phase modulator. (b) Scheme for generating a PM wave by using a frequency modulator.

Chapter 2: Continuous-Wave Modulation ©2000, John Wiley & Sons, Inc. Haykin/Communication Systems, 4th Ed Figure 2.21 Block diagram of a method for generating a narrowband FM signal.