A General Theory of Intelligible Crosstalk between Frequency-Division Multiplexed Angle-Modulated Carriers

A new method for calculating intelligible crosstalk between frequency-division multiplexed (FDM) angle-modulated carriers has been developed and is directly applicable to multicarrier operation in communications satellite systems. The analysis is general in scope and accounts for both the nonlinear amplitude and phase characteristics of the amplifying device by the use of a complex Bessel function expansion. Group delay and amplitude variation preceding the input of the nonlinear device are modeled using a Fourier series expansion. FDM baseband loading is also considered in the analysis. A comparison of theoretical results with measurement shows good agreement.