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Echo Distortion in the FM Transmission of Frequency-Division Multiplex

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2 Author(s)
Albersheim, W.J. ; Bell Telephone Laboratories, Inc., Deal, N.J. ; Schafer, J.P.

The composite multiplex signals generated by frequency-division methods long standard in telephone communication, can be transmitted by the new transcontinental broad-band FM radio relays. Signal intermodulation by echoes must be minimized. Such intermodulation is investigated in this paper experimentally and analytically. Two types of echoes are considered: (1) Weak echoes with delays exceeding 0.1 microseconds, caused mainly by mismatched long lines; and (2) Powerful echoes with delays shorter than 0.01 microseconds, caused by multipath transmission, and leading to selective fading. Using random noise signals, the distortion is evaluated as a function of various parameters of the echo, the baseband and the rf modulation.

Published in:

Proceedings of the IRE  (Volume:40 ,  Issue: 3 )

Date of Publication:

March 1952

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