Digitized enhanced Feher quadrature phase-shift keying (EFQPSK) can be realized with a set of parameters that define its efficiency relative to analog EFQPSK and quadrature phase-shift keying (QPSK). Both sampling frequency and quantization play a significant role in developing an EFQPSK signal that resembles its analog counterpart in spectral efficiency, envelope fluctuation, and BER. Sampling frequency and quantization can be used to determine spectral efficiency as compared to analog EFQPSK and QPSK. Through simulation, this study compares and quantifies trade-offs between spectral efficiency, envelope fluctuation, and BER. By quantifying the trade-off between these parameters, system designers can quickly determine how to meet bandwidth efficiency and power efficiency requirements
