Noise and bandwidth in PDM/FM radio telemetering
Kenneth M. Uglow · IRE Transactions on Telemetry and Remote Control · 1957
A general equation for signal/noise output ratio in PDM/FM transmission is presented. Two special cases devised by Feldman-Bennett and Nichols-Rauch are derived and discussed. The performance of PDM/FM/FM is derived, and the advantages of PDM/FM/FM over PAM/FM/FM for very narrow-band subcarrier work are pointed out.