Apparatus for time division multiplexed processing of frequency

Details Apparatus for time division multiplexed processing of frequency Apparatus for time division multiplexed processing of frequency

1992-07-29

1993-11-23

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358141, 358142, 375 39, H04N 544, H04N 704

Patent

active

052649377

ABSTRACT:
Apparatus for processing harmonically related plural quadrature amplitude modulated carriers includes sampling apparatus for converting the plural modulated carriers to sampled data format. The sampling apparatus is arranged to sample the signals at a frequency equal to four times the symbol rate of the highest frequency carrier such that alternate samples correspond to in-phase and quadrature-phase components of the signal. The sampled data signals are resampled to separate respective in-phase and quadrature-phase components of the respective signals. The in-phase samples of the respective signals are time division multiplexed and coupled to a Nyquist or symbol shaping filter arranged to operate in a time division multiplexed manner.

REFERENCES:
patent: 4502074 (1985-02-01), Reitmeier
patent: 4514760 (1985-04-01), Balaban et al.
patent: 4918718 (1990-04-01), Emmons et al.
patent: 4961206 (1990-10-01), Tomlinson et al.
patent: 5168507 (1992-12-01), Critchlow et al.
Digital Communication by E. A. Lee & D. G. Messerschmitt, pp. 553-554, 1988, Kluwer Publishers, Boston, Mass., USA.
A VLSI Architecture for a High Speed All-Digital Quadrature Modulator and Demodulator for Digital Radio Applications, by Henry Samueli, IEEE Journal on Selected Areas in Communications, vol. 3, No. 8, Oct. 1990, pp. 1512-1519.

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