A generalized quadrature product subcarrier modulation system applies subcarrier modulation to quadrature modulated signals with constant envelope modulation suitable for efficient sinewave and squarewave subcarrier modulations. The quadrature subcarrier modulation enables the addition of new signals to the in-phase and quadrature phase signals with spectral isolation while maintaining a constant amplitude waveform.
Keywords: signal, signal processing, modulation
International Class: H04B1/7075, H04B1/707, H04B15/00, A61F2/06, H04L27/30