Abstract: Methods for predicting the power spectral density of modulated waveforms are based on symmetric and Hermitian forms of a matrix equation. These forms facilitate the use of a Fourier transform method of prediction. In one embodiment, these methods are applied to a particular class of constant-envelope waveforms known commonly as multi-h continuous phase modulation. Various expressions for the power spectral density are then provided as well as an expression for an upper bound. These expressions facilitate the design of waveforms for practical use.