Device and method of changing the noise characteristic in a receiver of a data transmission system

• US 6,466,631 B1
• Filed: 07/28/2000
• Issued: 10/15/2002
• Est. Priority Date: 01/28/1998
• Status: Expired due to Term

• Current Assignee: Lantiq Beteiligungs-GmbH & Company KG (Intel Corporation)
• Original Assignee: Infineon Technologies AG
• Inventors: Schenk, Heinrich
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US09/627,732
• Time in Patent Office: 809 Days
• Field of Search: 375/232, 375/254, 375/285, 375/346, 375/348, 375/233, 381/94.1, 381/94.4, 704/226
• US Class Current: 375/346
• CPC Class Codes: H04L 25/03057 with a recursive structure H04L25/03031 takes precedence

Abstract

A device for changing a noise characteristic in a receiver of a data transmission system that contains a noise predictor that is connected to a noise attenuator. In this configuration, the dimensioning of the noise attenuator is fixed whereas coefficients of the noise predictor can be adaptively adjusted to the respective interference.

Claims

1. In a data transmission system having a receiver, a device for changing a noise characteristic in the receiver, the device comprising:

a noise predictor having coefficients that can be adaptively adjusted to a respective interference; and

a noise attenuator connected to said noise predictor and having fixed dimensions, and a signal, which results from a subtraction of a noise signal and an input signal from said noise attenuator, being fed to said noise predictor and said noise attenuator.

2. The device according to claim 1, wherein said noise attenuator is a first-order system having a transfer function defined by:

$\mathrm{NA}<br><br>\left(z\right)=\frac{a_1+a_2·<br><br>z^{-1}}{1+b_2·<br><br>z^{-1}},$

where a_i and b_i are coefficients of said noise attenuator, and z describes a complex z domain operator (z transformation).

3. The device according to claim 1, wherein said noise attenuator has fixed coefficients defined as:

a₁=−

⅞

;

a₂=0;

b₂=0

or

a₁=−

2;

a₂={fraction (9/16)};

b₂=½

.

4. A method for changing noise characteristics in a receiver, which comprises the steps of:

providing a data transmission system having the receiver, a noise predictor, and a noise attenuator;

fixing a dimensioning of the noise attenuator;

feeding a signal, which results from a subtraction of a noise signal and an input signal from the noise attenuator, to the noise predictor and the noise attenuator; and

adaptively adjusting coefficients of the noise predictor to a respective interference.

5. The method according to claim 4, which comprises providing the noise attenuator as a first-order system having a transfer function defined by:

$\mathrm{NA}<br><br>\left(z\right)=\frac{a_1+a_2·<br><br>z^{-1}}{1+b_2·<br><br>z^{-1}},$

where a_i and b_i are coefficients of the noise attenuator, and z describes a complex z domain operator (z transformation).

6. The method according to claim 4, which comprises providing the noise attenuator with fixed coefficients defined by:

a₂=−

⅞

;

a₂=0;

b₂=0

or

a₁=−

2;

a₂={fraction (9/16)};

b₂=½

.