H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/5, 363/8
H04J 1/12 (2006.01) H04B 3/54 (2006.01) H04L 7/00 (2006.01) H04L 25/45 (2006.01) H04L 27/18 (2006.01)
Patent
CA 1107869
ABSTRACT OF THE DISCLOSURE The invention relates to a digital communication system of the type transmitting data on a plurality of modulated frequency-diversity-multiplex carriers interspersed between harmonics of a system-wide signal and utilizing a main synchronized detector at a receiving end. The system is immunized to signal degradation due to reception of "noise" from the shifting of both signal harmonics and the modulation sidebands of adjacent carriers into the passband of the desired communication signal. The methods used for interference minimization includes: emplacing each data carrier at a frequency mid-way between adjacent harmonics of the system-wide signal, locking the frequency of the data carrier to the system-wide signal frequency to maintain the data carrier fre- quency exactly mid-way between two adjacent harmonics of the system-wide signal, transmitting the data in digital form and modulating each data carrier at a baud rate essentially equal to an exact even submultiple of the frequency of the system-wide potentially-interfering signal, and detecting the transmitted digitally-modulated carrier at the receiving end by use of long- time-constant bandpass filters. The main synchronized data detector uses integrating filters which discharge their storage elements after each baud time period, as determined by a baud clock synchronized with the system-wide signal.
286290
Rankin Richard W.
Stutt Charles A.
Company General Electric
Eckersley Raymond A.
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