Power spectrum density optimization

Patent metadata

Field	Value
Publication number	US-9985685-B2
Application number	US-201514861467-A
Country	US
Kind code	B2
Filing date	Sep 22, 2015
Priority date	Sep 26, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A method comprising allocating one or more detection tones of a sync symbol for crosstalk-free feedback data estimation, wherein the one or more detection tones are a quiet signal; transmitting the one or more detection tones to a computing device, receiving the crosstalk-free feedback data from the computing device, wherein the crosstalk-free feedback data comprises data associated with a background noise detected during the detection tones; determining an optimized PSD based at least in part on the crosstalk-free feedback data; and adjusting a transmission PSD of a plurality of tones based at least in part on the optimized PSD.

First claim

What is claimed is:

1. An apparatus comprising:
a processor configured to define one or more detection tones in a sync symbol for crosstalk-free feedback data estimation, wherein the one or more detection tones are portions of the sync symbol being transmitted that are empty of data;
a transmitter operably coupled to the processor and configured to transmit the sync symbol having the one or more detection tones to a computing device; and
a receiver operably coupled to the processor and configured to receive crosstalk-free feedback data from the computing device, wherein the crosstalk-free feedback data comprises data associated with a background noise detected during the one or more detection tones,
wherein the processor is further configured to estimate an optimized power spectral density (PSD) used by the transmitter to transmit a plurality of tones to the computing device, and
wherein the optimized PSD is based at least in part on the crosstalk-free feedback data.

2. The apparatus of claim 1 , wherein the crosstalk-free feedback data comprises at least one of a background noise measurement, a signal to noise ratio (SNR), an error sample, or a quiet line noise (QLN) measurement.

3. The apparatus of claim 1 , wherein the processor is further configured to define a plurality of subcarrier probe tones with an index equal to 10n+3, 10n+5, and 10n+9 as the one or more detection tones, and wherein n comprises an integer.

4. The apparatus of claim 1 , wherein the processor is further configured to adjust a transmission PSD for each tone of the plurality of tones based at least in part on the optimized PSD.

5. The apparatus of claim 1 , wherein the processor is further configured to extrapolate an estimation of the background noise to each tone of the plurality of tones.

6. The apparatus of claim 1 , wherein the computing device is configured to determine a crosstalk-free PSD corresponding to a PSD prior to cancelling crosstalk on a join line.

7. The apparatus of claim 1 , wherein the processor is configured to allocate power to a different location in a spectrum for each tone of the plurality of tones to optimize data throughput.

8. An apparatus comprising:
a receiver configured to receive one or more detection tones of a sync symbol for crosstalk-free feedback data estimation from a computing device, wherein the one or more detection tones are portions of the sync symbol being transmitted that are empty of data;
a processor operably coupled to the receiver and configured to measure the crosstalk-free feedback data, wherein the crosstalk-free feedback data comprises data associated with a background noise detected during the one or more detection tones; and
a transmitter operably coupled to the processor and configured to transmit the crosstalk-free feedback data to the computing device, wherein the computing device is configured to estimate an optimized power spectral density (PSD) based on the crosstalk-free feedback data.

9. The apparatus of claim 8 , wherein the crosstalk-free feedback data comprises at least one of a background noise measurement, a signal to noise ratio (SNR), an error sample, or a quiet line noise (QLN) measurement.

10. The apparatus of claim 8 , wherein a transmission PSD is adjusted from lower frequency subcarriers to higher frequency subcarriers for short loop lengths.

11. The apparatus of claim 8 , wherein the receiver is further configured to receive a message associated with an initial PSD from the computing device.

12. The apparatus of claim 8 , wherein a transmission PSD for each subsequent tone to be transmitted is adjusted in response to determining that the apparatus operates over a short loop length.

13. A method comprising:
allocating one or more detection tones of a sync symbol for crosstalk-free feedback data estimation, wherein the one or more detection tones are portions of the sync symbol being transmitted that are empty of data;
transmitting the sync symbol having the one or more detection tones to a computing device;
receiving the crosstalk-free feedback data from the computing device, wherein the crosstalk-free feedback data comprises data associated with a background noise detected during the one or more detection tones;
determining an optimized power spectral density (PSD) based at least in part on the crosstalk-free feedback data; and
adjusting a transmission PSD of a plurality of tones based at least in part on the optimized PSD.

14. The method of claim 13 , wherein the transmission PSD of each tone of the plurality of tones is adjusted to be the optimized PSD.

15. The method of claim 14 , wherein the transmission PSD for each tone of the plurality of tones is adjusted dynamically to a different location in a spectrum to optimize data throughput.

16. The method of claim 14 , wherein the transmission PSD for each tone of the plurality of tones is adjusted in response to ignoring a PSD ceiling received from the computing device.

17. The method of claim 13 , wherein the background noise excludes crosstalk noise.

18. The method of claim 13 , wherein the crosstalk-free feedback data comprises at least one of a background noise measurement, a signal to noise ratio (SNR), an error sample, or a quiet line noise (QLN) measurement.

19. The method of claim 13 , wherein the transmission PSD for the plurality of tones is adjusted in response to determining that the computing device operates over a short loop length, and wherein the PSD is adjusted to be higher for higher frequency bands.

Assignees

• Futurewei Technologies Inc

Inventors

• Yin Hui
• Pan Zhong
• Tu Jianping
• Liang Haixiang

Classifications

• H04B3/32 Primary

  Reducing cross-talk, e.g. by compensating · CPC title

• H04B3/487

  Testing crosstalk effects · CPC title

• H04B3/50

  Systems for transmission between fixed stations via two-conductor transmission lines (H04B3/54 takes precedence) · CPC title