Frequency Modulation

May 5th, 2015
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Data modulators, especially those intended to produce constantenvelope output signals, are “high-leverage” components in that even very small deviations from ideal in their behavior can lead to large degradations in overall system performance. Therefore, successful simulation of wireless communication systems depends upon the use of modulator models that capture all of the significant deviations from ideal behavior.

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Frequency ModulationChapter 9MODULATION ANDDEMODULATIONData modulators, especially those intended to produce constantenvelope output signals, are high-leverage components in that even very small deviations from ideal in their behavior can lead to large degradations in overall system performance. Therefore, successful simulation of wireless communication systems depends upon the use of modulator models that capture all of the signicant deviations from ideal behavior.In the usual development of data modulation techniques as presented in most communications texts, the various techniques are presented in order of complexity, starting with the simplest. Thus BPSK would be presented rst, then QPSK followed by m-PSK, and so on. Because of its relationship to complex-envelope representations of signals, quadrature modulation plays a central role in simulation of wireless communication systems and models for quadrature modulators, and demodulators serve as building blocks for most other types of data modulators and demodulators. Therefore, this chapter begins with a discussion of quadrature phase shift keying (QPSK) and uses this discussion as a vehicle for development of generic models for quadrature modulation and demodulation. The discussion then moves to binary phase shift keying (BPSK) and shows how this simpler format is modeled using the generic quadrature modulation models. A similar approach is then taken for developing models for multiple phas

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