Patent US6236714B1 successfully refreshed from Google Patents.
US6236714B1
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US
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Transmit power control for DSL modems in splitterless environment
Assignee: Ikanos Communications Inc
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Filing: 1999-07-07
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Granted: 2001-05-22
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Expires: 2019-07-07
Abstract
Abstract A Digital Subscriber Line (DSL) modem determines the proper transnit power level in a splitterless environment by transmitting a probe signal at different power levels to a telephone set and measuring the distortion signal reflected from the telephone set for each power level. The proper transmit power level is determined by detecting the “comer point” of the reflected distortion signal.
Inventors
- 👤 Qingyi Zheng
- 👤 Guozhu Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:22
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04M11/062; H04B; H04B3/00; H04B3/02; H04B3/46
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
143 words
A method of reducing distortion in the voiceband of a splitterless Digital Subscriber Line (DSL), comprising the steps of: transmitting a probe signal to at least one telephone set, the probe signal having a plurality of sections, each section including a plurality of symbols, wherein each section of symbols is transmitted at a predetermined power level; receiving a distortion signal reflected from the telephone set due to each section of the probe signal; detecting a corner point based on the measurement of the received distortion signal from the plurality of sections of the probe signal; wherein the corner point is detected by performing the steps of: computing a ratio having a numerator equal to the difference between each two adjacent measurements and a denominator equal to the difference between these two adjacent power levels; and finding a sharp change in the ratio value.
Claim 2
Independent Claim
143 words
A method of reducing distortion in the voiceband of a splitterless Digital Subscriber Line (DSL), comprising the steps of: transmitting a probe signal to at least one telephone set, the probe signal having a plurality of sections, each section including a plurality of symbols, wherein each section of symbols is transmitted at a predetermined power level; receiving a distortion signal reflected from the telephone set due to each section of the probe signal; detecting a corner point based on the measurement of the received distortion signal from the plurality of sections of the probe signal; wherein the corner point is detected by performing the steps of: computing a ratio having a numerator equal to the difference between each two adjacent measurements and a denominator equal to the difference between these two adjacent power levels; and finding a sharp change in the ratio value.
Claim 3
Dependent Claim
21 words
The method of claim 1 , further including the step of saving the power level associated with the detected corner point.
Claim 4
Dependent Claim
24 words
The method of claim 1 , wherein the measuring steps further include measuring the distortion signal in a frequency band different from the voiceband.
Claim 5
Dependent Claim
26 words
The method of claim 1 , wherein the adjusting step includes adjusting one power level to the next power level by a predetermined amount of power.
Claim 6
Dependent Claim
31 words
The method of claim 1 , wherein the adjusting step further includes adjusting one power level to the next power level by an amount of power determined by the ratio value.
Claim 7
Dependent Claim
20 words
The method of claim 1 , wherein the measuring steps further include measuring the average power of the distortion signal.
Claim 8
Dependent Claim
20 words
The method of claim 1 , wherein the transmitting step is initiated in response to a fast retrain request signal.
Claim 9
Dependent Claim
20 words
The method of claim 1 , wherein the transmitting step is initiated in response to detecting a hook state change.
Claim 10
Dependent Claim
145 words
A computer-readable medium having stored thereon instructions which, when executed by a processor, cause the processor to perform the steps of: transmitting a probe signal to at least one telephone set, the probe signal having a plurality of sections, each section including a plurality of symbols, wherein each section of symbols is transmitted at a predetermined power level; receiving a distortion signal reflected from the telephone set due to each section of the probe signal; and detecting a corner point based on the measurement of the received distortion signal from the plurality of sections of the probe signal, wherein the corner point is detected by performing the steps of: computing a ratio having a numerator equal to the difference between two adjacent measurements and a denominator equal to the difference between these two adjacent power levels; and finding a sharp change in the ratio values.
Claim 11
Dependent Claim
145 words
A computer-readable medium having stored thereon instructions which, when executed by a processor, cause the processor to perform the steps of: transmitting a probe signal to at least one telephone set, the probe signal having a plurality of sections, each section including a plurality of symbols, wherein each section of symbols is transmitted at a predetermined power level; receiving a distortion signal reflected from the telephone set due to each section of the probe signal; and detecting a corner point based on the measurement of the received distortion signal from the plurality of sections of the probe signal, wherein the corner point is detected by performing the steps of: computing a ratio having a numerator equal to the difference between two adjacent measurements and a denominator equal to the difference between these two adjacent power levels; and finding a sharp change in the ratio values.
Claim 12
Dependent Claim
22 words
The computer-readable medium of claim 9 , further including the step of saving the power level associated with the detected corner point.
Claim 13
Dependent Claim
25 words
The computer-readable medium of claim 9 , wherein the measuring steps further include measuring the distortion signal in a frequency band different from the voiceband.
Claim 14
Dependent Claim
27 words
The computer-readable medium of claim 9 , wherein the adjusting step includes adjusting one power level to the next power level by a predetermined amount of power.
Claim 15
Dependent Claim
32 words
The computer-readable medium of claim 9 , wherein the adjusting step further includes adjusting one power level to the next power level by an amount of power determined by the ratio value.
Claim 16
Dependent Claim
21 words
The computer-readable medium of claim 9 , wherein the measuring steps further include measuring the average power of the distortion signal.
Claim 17
Dependent Claim
21 words
The computer-readable medium of claim 9 , wherein the transmitting step is initiated in response to a fast retrain request signal.
Claim 18
Dependent Claim
21 words
The computer-readable medium of claim 9 , wherein the transmitting step is initiated in response to detecting a hook state change.
Claim 19
Independent Claim
178 words
A system for reducing distortion in the voiceband of a splitterless Digital Subscriber Line (DSL), comprising: a probe signal generator coupled to a telephone line for transmitting a probe signal to at least one telephone set the probe signal having a plurality of sections, each section including a plurality of symbols that are transmitted at a predetermined power level; a distortion level detector coupled to the telephone line for receiving and measuring a distortion signal reflected from the telephone set due to each section of the probe signal; and a corner point detector coupled to the probe signal generator and the distortion level detector for detecting a corner point in the received distortion signal based on the measurements of the received distortion signal from the plurality of sections of the probe signal, wherein the corner point detector performs the steps of: computing a ratio having a numerator equal to the difference between each two adjacent measurements and a denominator equal to the difference between these two adjacent power levels; and finding a sharp change in the ratio value.
Claim 20
Independent Claim
178 words
A system for reducing distortion in the voiceband of a splitterless Digital Subscriber Line (DSL), comprising: a probe signal generator coupled to a telephone line for transmitting a probe signal to at least one telephone set the probe signal having a plurality of sections, each section including a plurality of symbols that are transmitted at a predetermined power level; a distortion level detector coupled to the telephone line for receiving and measuring a distortion signal reflected from the telephone set due to each section of the probe signal; and a corner point detector coupled to the probe signal generator and the distortion level detector for detecting a corner point in the received distortion signal based on the measurements of the received distortion signal from the plurality of sections of the probe signal, wherein the corner point detector performs the steps of: computing a ratio having a numerator equal to the difference between each two adjacent measurements and a denominator equal to the difference between these two adjacent power levels; and finding a sharp change in the ratio value.
Claim 21
Dependent Claim
25 words
The system of claim 17 , wherein the corner point detector saves one of the plurality of power levels if the corner point is detected.
Claim 22
Dependent Claim
19 words
The system of claim 17 , wherein the distortion level detector measures the average power of the distortion signal.
Claim 23
Dependent Claim
20 words
The system of claim 17 , wherein the probe signal is generated in response to a fast retrain request signal.
Claim 24
Dependent Claim
20 words
The system of claim 17 , wherein the probe signal is generated in response to detecting a hook state change.
Claim 25
Dependent Claim
34 words
The system of claim 17 , wherein the probe signal generator adjusts the power level of the probe signal from one power level to the next power level by a predetermined amount of power.
Claim 26
Dependent Claim
38 words
The system of claim 17 , wherein the probe signal generator adjusts the power level of the probe signal from one power level to the next power level by an amount of power determined by the ratio value.
Claim 27
Dependent Claim
27 words
The system of claim 13 , wherein the system further includes a filter that prevents the distortion level detector from measuring the distortion signal in the voiceband.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-21 | 2004-11-20 | 2005-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-21 | 2008-11-20 | 2009-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-21 | 2012-11-20 | 2013-05-22 | $7700.00 | Window Closed / Lapsed |