Adaptive allocation for variable bandwidth multicarrier communic

Details Adaptive allocation for variable bandwidth multicarrier communic Adaptive allocation for variable bandwidth multicarrier communic

1997-06-12

2000-06-06

Pham, Chi H.

Multiplex communications

Diagnostic testing

Determination of communication parameters

370468, 455 673, H04B 346, H04J 314, H04J 316

Patent

active

060727799

ABSTRACT:
Data is distributed among the channels of an asymmetric data subscriber loop (ADSL) communications system in accordance with an adaptive algorithm which from time to time measures the signal to noise ratio of the various channels and finds a margin for each channel dependent on achievement (where possible) of a given bit error rate and a desired data transmission rate. The margin distribution is achieved by augmenting the constellation signal to noise ratio to enhance computational efficiency and allow redetermination of bit allocation tables during transmission as necessary. Pairs of bit allocation tables are maintained at the transmitter and receiver and one table of each pair at the transmitter and receiver is updated while the other pair is in use for controlling communication.

REFERENCES:
patent: 5327574 (1994-07-01), Monma et al.
patent: 5479447 (1995-12-01), Chow et al.
patent: 5598435 (1997-01-01), Williams
patent: 5812599 (1998-09-01), Van Kerckhove

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