DYNAMIC DIGITAL COMMUNICATION SYSTEM CONTROL

• US 20140254704A1
• Filed: 03/17/2014
• Published: 09/11/2014
• Est. Priority Date: 06/01/2001
• Status: Active Grant

• Current Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford Management Co.)
• Original Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford Management Co.)
• Inventors: Ginis, Georgios, Yu, Wei, Zeng, Chaohuang, Cioffi, John M.
• Granted Patent: US 9,160,385 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/1081 Reduction of multipath noise by equalising H04B7/005
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H04B 2001/1045 Adjacent-channel interference
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04B 3/46 Monitoring; Testing
• CPC Class Codes: H04B 3/466 Testing attenuation in combination with at least one of group delay and phase shift
• CPC Class Codes: H04B 3/487 Testing crosstalk effects
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 7/0016 correction of synchronization errors
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data

Abstract

Control of a digital communication system having a plurality of communication lines on which signals are transmitted and received is implemented using a variety of methods and systems. According to one embodiment of the present invention, a method is implemented where the signals are affected by interference during transmission and each of the communication lines has at least one transmitter and at least one receiver. A model is created of the interference characteristics due to the signals carried on the communication lines. Interference characteristics for a line are determined based on the model and actual signals carried on other communication lines different from the line for which the characteristics are being determined. Actual interference is compensated for on the communication line using the determined interference characteristics.

Claims

1. A method of vectored reception in a Digital Subscriber Line (DSL) system using Discrete Multi-tone communications over a plurality of communications lines, each of the plurality of communication lines having at least one transmitter and at least one receiver, and wherein cross-talk interference between the plurality of communication lines occurs during reception, the method comprising:

receiving signals within a plurality of tones from at least one of the plurality of communication lines,

determining parameters of a canceller block using a communication adaptation unit and line and signal characteristics of the plurality of communication lines, and

eliminating or reducing, using the canceller block and the determined parameters, crosstalk within each tone of the plurality of tones of the signals received from at least one of the plurality of communication lines, and receiving the signals within each tone from the canceller block.

2. The method of claim 1, further including employing block reception using the DSL system.

3. The method of claim 2, further including employing block transmission using the DSL system, and wherein the block transmission and reception are synchronized.

4. The method of claim 1, wherein determining the parameters of the canceller block relies on knowledge of a channel matrix.

5. The method of claim 4, wherein determining the parameters of the canceller block further relies on knowledge of a noise covariance matrix.

6. The method of claim 4, further including the step of obtaining the channel matrix knowledge by training-based channel identification performed during initialization.

7. The method of claim 1, wherein the reception is of at least one of an upstream communication and a downstream communication.

8. An apparatus for vectored reception in a Digital Subscriber Line (DSL) system using Discrete Multi-tone communications over a plurality of communications lines, each of the plurality of communication lines having at least one transmitter and at least one receiver, and wherein cross-talk interference between the plurality of communication lines occurs during reception, the apparatus comprising:

a first circuit configured and arranged to receive signals within a plurality of tones from at least one of the plurality of communication lines,

a second circuit configured and arranged to determine parameters of a canceller block using a communication adaptation unit and line and signal characteristics of the plurality of communication lines, and

a third circuit configured and arranged to eliminate or reduce, using the canceller block and the determined parameters, crosstalk within each tone of the plurality of tones of the signals received from at least one of the plurality of communication lines, and receiving the signals within each tone from the canceller block.

9. The apparatus of claim 8, further including a circuit configured and arranged to employ block reception using the DSL system.

10. The apparatus of claim 9, further including a circuit configured and arranged to employ block transmission using the DSL system, and wherein the block transmission and reception are synchronized.

11. The apparatus of claim 8, wherein the second circuit is configured and arranged to rely on knowledge of a channel matrix.

12. The apparatus of claim 8, wherein the second circuit is configured and arranged to rely on knowledge of a noise covariance matrix.

13. The apparatus of claim 8, wherein the second circuit is configured and arranged to rely on knowledge of a channel matrix, and further including a circuit configured and arranged to obtain the channel matrix knowledge by training-based channel identification performed during initialization.

14. The apparatus of claim 8, wherein the reception is of at least one of an upstream communication and a downstream communication.

15. A method of communication comprising the steps of:

using the apparatus of claim 8 to eliminate or reduce, by using the canceller block and the determined parameters, crosstalk within each tone of the plurality of tones of the signals received from at least one of the plurality of communication lines, and thereby receiving the signals within each tone from the canceller block.

16. A method of vectored communication in a Digital Subscriber Line (DSL) system using Discrete Multi-tone communications over a plurality of communications lines, each of the plurality of communication lines having at least one transmitter and at least one receiver, and wherein cross-talk interference between the plurality of communication lines occurs during the communication, the method comprising:

communicating signals within a plurality of tones from at least one of the plurality of communication lines, and

in response to and based on a communication adaptation unit, parameters determined for signal cancellation, and line and signal characteristics of the plurality of communication lines, eliminating or reducing crosstalk within each tone of the plurality of tones of the signals communicated via at least one of the plurality of communication lines.