Dynamic digital communication system control

• US 10,404,300 B2
• Filed: 12/12/2017
• Issued: 09/03/2019
• Est. Priority Date: 06/01/2001
• Status: Expired due to Term

• 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.
• Primary Examiner(s): Corrielus, Jean B
• Application Number:
  US15/838,684
• Publication Number:
  US 20180278282A1
• Time in Patent Office: 630 Days
• 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 controlling a digital communication system having a plurality of communication channels on which signals are transmitted and received, the signals being affected by crosstalk interference during transmission, each of the communication channels being used by users and each user having at least one transmitter and at least one receiver, the method comprising:

collecting information about the channel, signal and far-end crosstalk interference characteristics of the communication channels;

in response to the collecting, creating a model of the channel, signal and far-end crosstalk interference characteristics of the communication channels, by accounting for a reciprocity property in upstream and downstream directions of the communication channels; and

synchronizing the transmitted and received signals across multiple transmitters and receivers to permit signal processing using the model to remove far-end crosstalk interference from the signals.

2. The method of claim 1, wherein the step of creating occurs on at least one side of the communication channel and the step of synchronizing occurs on said at least one side of the communication channel.

3. The method of claim 1, wherein the step of creating a model considers the channel, signal and far-end crosstalk interference characteristics of the communication channels in the downstream direction.

4. The method of claim 1, wherein the step of creating a model considers the channel, signal and far-end crosstalk interference characteristics of the communication channels in the upstream direction.

5. The method of claim 1, further including signal processing using the model to remove far-end crosstalk interference from the signals.

6. The method of claim 5, wherein said signal processing is performed either:

prior to the transmission of the signals;

after reception of the signals;

or both prior to the transmission of the signals and after reception of the signals.

7. The method of claim 1, wherein the step of synchronizing transmissions of signals includes using at least one of:

block transmission; and

block reception.

8. The method of claim 5, wherein the digital communication system uses a multi-carrier modulation scheme.

9. The method of claim 8, wherein the step of signal processing is done on a carrier by carrier basis.

10. The method of claim 8, including the step of allocating different energy levels across different carriers.

11. The method of claim 8, wherein the step of signal processing using the model includes dynamically adjusting the carriers used to transmit the signals.

12. The method of claim 8, wherein the step of signal processing using the model includes modifying power to each transmitter among the plurality of transmitters.

13. The method of claim 1, wherein the step of creating a model includes providing precoder coefficients which account for the reciprocity property in upstream and downstream directions of the communication channels.

14. The method of claim 5, wherein said reciprocity property relates to propagation characteristics of the upstream and downstream directions of the communication channels.