Discrete multi-tone processor in asymmetric digital...

Details Discrete multi-tone processor in asymmetric digital... Discrete multi-tone processor in asymmetric digital...

2005-03-15

2005-03-15

Booure, Tesfaldet (Department: 2631)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

06868118

ABSTRACT:
A discrete multi-tone (DMT) processor receives predetermined control signals from a digital signal processor (DSP) within an asymmetric digital subscriber line (ADSL) modem, modulates transmission data in response to the control signals, and demodulates reception data. The DMT processor includes a frame synchronization signal generator, a transmitter, and a receiver. The frame synchronization generator generates a transmission frame synchronization signal and a reception frame synchronization signal in response to a cyclic prefix contained in the transmission data or reception data and a reception synchronization shift signal applied from the DSP. The transmitter DMT modulates and gain-controls the transmission data input in response to the transmission frame synchronization signal The receiver gain-controls and DMT demodulates the reception data response to the reception frame synchronization.

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Wu, et al., “A Fast Algorithm for Reduced-Complexity Programmable DSP Implementation of the IFFT/FFT in DMT Systems”, Globecom 98 vol. 2, p.p. 833-838 (Nov. 8-12, 1998).

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