FDM-TDM transforming device

Details FDM-TDM transforming device FDM-TDM transforming device

1989-11-22

1991-08-06

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 50, 370 97, H04J 102

Patent

active

050383442

ABSTRACT:
Received FDM (Frequency Division Multiplex) SCPC (Single Channel Per Carrier) signals are usually converted into intermediate frequency band signals and then transformed into TDM (Time Division Multiplex) signals by an FDM-TDM transforming device which uses a chirp filter. The FDM-TDM transforming device has a chirp signal generating circuit, a mixer for multiplying the FDM SCPC signals by the chirp signal, and a chirp filter which receives outputs of the mixer and feeds out TDM signals. The FDM SCPC signals are frequency-swept by the chirp signal at the mixer and then applied to the chirp filter. The individual FDM frequency-swept signals applied to the chirp filter are outputted after being compressed to time locations each being assigned to a different sweep frequency.

REFERENCES:
patent: 4759013 (1988-07-01), Ichiyoshi
patent: 4901310 (1990-02-01), Ichiyoshi
T. Kohri et al., "A 400ch SCPC Signal Demodulator Using Chirp Transform and Correlation Detection Scheme", Globecom Tokyo, Nov. 1987, Session 8.

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