System and method for subliminal time domain duplexing

Details System and method for subliminal time domain duplexing System and method for subliminal time domain duplexing

2006-05-16

2006-05-16

Swerdlow, Daniel (Department: 2646)

Telephonic communications

Transmission line conditioning

Interference suppression

C370S201000, C370S280000, C370S286000

Reexamination Certificate

active

07046798

ABSTRACT:
The present invention provides methods and apparatus for transmitting a data-bearing signal and a non-data-bearing signal. One embodiment comprises communicatively coupling a data-bearing signal during a first time period and communicatively coupling a non-data-bearing signal during a second time period. The data-bearing signal has a first PSD. The non-data-bearing signal has a second PSD substantially the same as the first over a range of frequencies. The non-data-bearing signal has characteristics facilitating echo cancellation. Another embodiment comprises a line interface and a transmitter coupled to the line interface, comprising a data encoder and a periodic signal generator. The encoder is configured to produce a data-bearing signal with a first PSD. The periodic signal generator is configured to produce a non-data-bearing signal with a second PSD. The second PSD is substantially the same as the first PSD over a first range of frequencies. The non-data-bearing signal has characteristics facilitating echo cancellation.

REFERENCES:
patent: 5400322 (1995-03-01), Hunt et al.
patent: 5521906 (1996-05-01), Grube et al.
patent: 6201830 (2001-03-01), Chellali et al.
patent: 6885699 (2005-04-01), Verbin
“Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come” by John A.C. Bingham, Published May 1990 in IEEE Communications Magazine.

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