New Developments in FM Reception and Their Application to the Realization of a System of "Power-Division" Multiplexing

Two techniques-feedforward across a limiter and dynamic trapping-are described to show how the message carried by the weaker of two cochannel FM signals can be extracted with negligible distortion even when its amplitude is much smaller than that of the stronger signal. The development of these techniques marks the end of the stronger-signal capture limitation of FM systems and ushers in more efficient spectrum utilization, as well as new applications for frequency modulation.