Figure (a) The modulating signal m(t)

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Presentation transcript:

Figure 7. 31 (a) The modulating signal m(t) Figure 7.31 (a) The modulating signal m(t). (b) PSK: the modulated signal m(t) cos ωct. (c) FSK: the modulated signal. Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure 7.32 PSD of (a) ASK, (b) PSK, and (c) FSK. Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure 7. 33 (a) Noncoherent detection of FSK Figure 7.33 (a) Noncoherent detection of FSK. (b) Coherent detection of FSK. Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure 7.34 Coherent binary PSK detector (similar to a DSB-SC demodulator). Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure 7.35 (a) Differential encoding; (b) encoded signal; (c) differential PSK receiver. Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure 7.36 Binary FSK symbols in the two-dimensional orthogonal signal space. Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure 7.37 M-ary PSK symbols in the orthogonal signal space: (a) M = 2; (b) M = 4; (c) M = 8. Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure 7.38 (a) QAM or quadrature multiplexing and (b) 16-point QAM (M = 16). Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure P.7.3-6 Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure P.7.3-7 Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure P.7.4-2 Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure P.7.4-3 Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.

Figure P.7.8-1 Modern Digital and Analog Communication Systems Lathi Copyright © 2009 by Oxford University Press, Inc.