Chapter 2. Common Analog Modulation and Pulse-Shaping Methods

The choice of a modulation method and pulse-shaping scheme depends greatly on the availability of the spectrum, the desired data rate, and the radio channel itself. In turn, the modulation method influences the design complexity of the modem. In several SDR applications, the designer is faced with supporting multiple waveforms each with its own modulation and pulse-shaping technique, bandwidth, transmit mask and transmit power, etc.

A modulation scheme is influenced by various factors. The most commonly desired features of any waveform are:

  • Spectrally efficient modulation that occupies the least amount of spectrum and minimally interferes with adjacent and neighboring channels

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