Interference canceller tap sharing in a communications...

Details Interference canceller tap sharing in a communications... Interference canceller tap sharing in a communications...

2006-04-12

2010-06-15

Briney, III, Walter F (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S392010

Reexamination Certificate

active

07738655

ABSTRACT:
A novel mechanism for sharing filter taps across a plurality of interference cancellers. Each interference canceller may be directed to impairment, such as Ethernet impairments, including Ethernet 1000Base-T impairments. Various interference impairments include echo cancellation, NEXT cancellation and/or other interference detection or cancellation, etc. The hardware requirements of the interference impairment cancellers are reduced by sharing filter taps among the cancellers. In a first embodiment, the taps from a unified filter tap bank are shared across all the interference impairment cancellers for all four channels and over all ports. In a second embodiment, a portion of the taps of each filter are shared wherein each canceller comprises a fixed filter tap portion and a shared filter tap portion. A tap allocation algorithm assigns taps to those cancellers that need them the most. A canceller configuration is selected that yields maximal interference mitigation and the taps are allocated accordingly.

REFERENCES:
patent: 4947425 (1990-08-01), Grizmala et al.
patent: 5546459 (1996-08-01), Sih et al.
patent: 2001/0036160 (2001-11-01), Curran et al.
Akihiko Sugiyama & Frederic Landais, A New Adaptive Intersubband Tap-Assignment Algorithm for Subband Adaptive Filters, in 5 International Conference on Acoustics, Speech and Signal Processing 3051 (IEEE May 1995).

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