Multicarrier modulation with data dependent frequency-domain...

Details Multicarrier modulation with data dependent frequency-domain... Multicarrier modulation with data dependent frequency-domain...

2006-07-11

2006-07-11

Bayard, Emmanuel (Department: 2638)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07075999

ABSTRACT:
A modem (10) for transmitting a discrete multitone modulated (DMT) signal over a communications channel (H) is disclosed. In the encoding of an input bitstream, unloaded subchannels in the DMT spectrum are assigned signal values so that a trailing portion of each block or frame of the resulting datastream are forced to a known value, for example zero. The known-valued trailing portion of each block provides the effect of a cyclic prefix, without necessitating the prepending of an actual cyclic prefix and incurring the corresponding data rate loss; alternatively, the effect of a cyclic prefix can be augmented by the forcing of the trailing portion of the blocks to known values.

REFERENCES:
patent: 4943980 (1990-07-01), Dobson et al.
Gatherer et al., “Controling clipping probability in DMT Transmission”,Proceedings of the Asilomar Conference on Signals, Systems, and Computers(1997), pp. 578-584.

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