Apparatus for time division multiplexed processing of plural QAM

Details Apparatus for time division multiplexed processing of plural QAM Apparatus for time division multiplexed processing of plural QAM

1992-07-29

1993-11-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370112, 375 15, 358141, H04J 1100, H04J 304, H04N 708

Patent

active

052630188

ABSTRACT:
The present invention includes apparatus for processing harmonically related plural quadrature amplitude modulated carriers. Sampling apparatus converts the plural modulated carriers signal to sampled data format. The signal is sampled 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 the quadrature-phase samples are time division multiplexed. The time division multiplexed in-phase samples and quadrature-phase samples are coupled to a phase correction apparatus arranged to operate in a time division multiplexed manner.

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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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