Method for fine gains adjustment in an ADSL communications syste

Details Method for fine gains adjustment in an ADSL communications syste Method for fine gains adjustment in an ADSL communications syste

1996-06-07

1998-10-13

Chan, Jason

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

371 51, 375254, 375285, H04K 110, H04L 2728

Patent

active

058223746

ABSTRACT:
A communications system (30) includes a transceiver (42) for transmitting a plurality of bins. Individual bin BERs (bit-error-rates) are iteratively equalized. This is accomplished by applying a fine gains adjustment to the transmit power of the transceiver (42). Specifically, the BER of the bins is equalized by calculating an adjustment gain and subtracting the adjustment gain from the bin currently having the maximum margin and adding the same adjustment gain to the bin currently having the minimum margin. The iterations continue until all of the bin margins are within a predetermined threshold. This changes the individual bin transmit power levels without substantially changing the aggregate transmit power level. The BER is substantially equalized, without causing the individual transmit power levels to exceed a predetermined range, such as that required by ANSI T1E1.4.

REFERENCES:
patent: 5479447 (1995-12-01), Chow et al.
patent: 5559790 (1996-09-01), Yano et al.
patent: 5673290 (1997-09-01), Cioffi
John M. Cioffi; "DMT Information Bus for Multidrop Interface on Existing Wiring;" Amati Communications Corporation; pp. 1-6 (jun. 6, 1994).
Chow, et al.; "A Practical Discrete Multitone Transceiver Loading Algorithm for Data Transmission over Spectrally Shaped Channels;" IEEE Trans. on Comm., vol. 43, No. 2/3/4; pp. 773-775 (1995).
Draft American National Standard for Telecommunications; "Asymmetric Digital Subscriber Line (ADSL) Metallic Interface;" American Nat'l Standards Institute, Inc.; pp.i-xii, pp. 2-171 (1994).

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