Carrier supply for frequency division multiplexed systems

Details Carrier supply for frequency division multiplexed systems Carrier supply for frequency division multiplexed systems

1981-02-02

1983-06-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 74, H04J 102, H04J 106

Patent

active

RE0312959

ABSTRACT:
The terminals in the frequency division multiplexed systems of the prior art employ many steps of modulation whose frequency variations, due to changes in the frequencies generated by the carrier oscillators, add to produce a frequency offset which is unacceptable in modern wideband systems. The terminals of the present invention use additional modulators connected to the carrier oscillators to reduce the frequency offset of the transmitted signal to the frequency variations of only a single oscillator.

REFERENCES:
patent: 2228815 (1941-01-01), Deerhake
patent: 2445664 (1948-07-01), Doelnz
patent: 2602159 (1952-07-01), Wirkler
patent: 2849605 (1958-08-01), Fickett
patent: 3049674 (1962-08-01), Stone
patent: 3176226 (1965-03-01), Berger
patent: 3217256 (1965-11-01), Palatinus
patent: 3514701 (1970-05-01), Palatinus
patent: 3523249 (1970-08-01), Palatinus
patent: 3555426 (1971-01-01), Rogers

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