Rate adaptive digital subscriber line (RADSL) modem

Details Rate adaptive digital subscriber line (RADSL) modem Rate adaptive digital subscriber line (RADSL) modem

1998-02-02

2000-12-26

Pham, Chi H.

Multiplex communications

Duplex

Communication over free space

370540, H04J 100, H04B 310

Patent

active

061670340

ABSTRACT:
The invention provides a transceiver which is preferably used for high speed communications between a customer location and a central office over a subscriber line. The transceiver uses a pseudorandom noise generator both to provide a correlation for a complementary transceiver to use in achieving synchronization and as a way to transmit data in an extremely robust fashion. In addition, the transceiver uses frequency domain multiplexing so that downstream data and upstream data are transmitted by their respective transceivers in completely separate and distinct frequency bands. In order to achieve high data transfer rates, the transceivers can operate in an asymmetrical manner, whereby either (but, typically, the central office) transceiver can transmit data at a higher rate than the other transceiver.

REFERENCES:
patent: 4756007 (1988-07-01), Qureshi et al.
patent: 4802189 (1989-01-01), Wedler
patent: 5023869 (1991-06-01), Grover et al.
patent: 5394392 (1995-02-01), Scott
patent: 5450438 (1995-09-01), Landry et al.
patent: 5541955 (1996-07-01), Jacobsmeyer
patent: 5751701 (1998-05-01), Langberg et al.
patent: 6031848 (2000-02-01), Brennan

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