Method and apparatus for equallization in an asymmetric digital

Details Method and apparatus for equallization in an asymmetric digital Method and apparatus for equallization in an asymmetric digital

1998-02-13

2000-04-04

Vo, Don N.

Pulse or digital communications

Equalizers

Automatic

708323, H03H 730, H03H 740, H03K 5159

Patent

active

060470259

ABSTRACT:
An equalizer (106, 146) for use in systems such as an asymmetric digital subscriber line (ADSL) transceiver (5) reduces the number of calculations required for updating the equalizer coefficients. The equalizer (106, 146) takes advantage of the substantially symmetrical phase and amplitude distortion of the signal constellation, which causes both the amplitude and the phase relationship of the calculated error term for each constellation point to be equal. Instead of performing a full complex multiplication, the equalizer (106, 146) uses some but not all of the product terms between the real and imaginary components of the calculated error term and the conjugate of the received data estimate in the coefficient update calculation. The result is then scaled to account for the missing terms. The resulting equalizer (106, 146) requires fewer calculations for coefficient updating.

REFERENCES:
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patent: 5311546 (1994-05-01), Paik et al.
patent: 5479447 (1995-12-01), Chow et al.
patent: 5732112 (1998-03-01), Langberg
D.E. Johnson et al., Basic Electric Circuit Analysis, Department of Electrical Engineering, Louisiana State University, pp. 507-512 (1978).

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