US6452987B1
Expired / Lapsed
US
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Fast start-up in discrete multi-tone (DMT) based communications system
Assignee: Nokia of America Corp
•
Filing: 1998-11-25
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Granted: 2002-09-17
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Expires: 2018-11-25
Abstract
Abstract In an Asymmetric Digital Subscriber Loop (ADSL) Discrete Multi-Tone (DMT) system, a DMT receiver uses, during start-up, an automatic gain control (AGC) element and a rotator element in place of a one-tap complex finite impulse response (FIR) filter.
Inventors
- 👤 Patrik Larsson
- 👤 Jean-Jacques Werner
- 👤 Jian Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:50
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26; H04L27/2601; H04L27/2647; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03159; H04L27/2614; H04L2025/0335; H04L2025/03375; H04L2025/03414; H04L2025/03433; H04L2025/03439; H04L2025/03522
Claims Analysis
Total Claims: 74
Claim 1
Independent Claim
96 words
A method for use in multi-carrier equipment, the method comprising the steps of: receiving a multi-carrier data signal; and processing the received multi-carrier data signal such that at least one of the carriers is equalized by an automatic gain control element and a rotator element, wherein: during a start-up phase, the automatic gain control element and the rotator element are configured to use a first algorithm of operation; and during a steady-state phase, the automatic gain control element and the rotator element are configured to use a second algorithm of operation different from the first algorithm.
Claim 2
Independent Claim
96 words
A method for use in multi-carrier equipment, the method comprising the steps of: receiving a multi-carrier data signal; and processing the received multi-carrier data signal such that at least one of the carriers is equalized by an automatic gain control element and a rotator element, wherein: during a start-up phase, the automatic gain control element and the rotator element are configured to use a first algorithm of operation; and during a steady-state phase, the automatic gain control element and the rotator element are configured to use a second algorithm of operation different from the first algorithm.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the automatic gain control element and rotator element are used in place of a complex finite impulse response filter.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the multi-carrier data signal is a discrete multi-tone (DMT) signal.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the multi-carrier equipment is asynchronous digital subscriber line equipment.
Claim 6
Independent Claim
53 words
A method for use in multi-carrier equipment, the method comprising the steps of: receiving a multi-carrier data signal; and processing the received multi-carrier data signal such that for at least one of the carriers an automatic gain control element and a rotator is used in place of a complex finite impulse response filter.
Claim 7
Independent Claim
53 words
A method for use in multi-carrier equipment, the method comprising the steps of: receiving a multi-carrier data signal; and processing the received multi-carrier data signal such that for at least one of the carriers an automatic gain control element and a rotator is used in place of a complex finite impulse response filter.
Claim 8
Dependent Claim
16 words
The method of claim 5 wherein the multi-carrier data signal is a discrete multi-tone (DMT) signal.
Claim 9
Dependent Claim
15 words
The method of claim 5 wherein the multi-carrier equipment is asynchronous digital subscriber line equipment.
Claim 10
Independent Claim
57 words
A method for use in multi-carrier equipment, the method comprising the steps of: during a start-up phase, processing at least one carrier of a received multi-carrier data signal by using an automatic gain control element and a rotator; and during a steady-state phase, processing the at least one carrier by using a least mean-square type of algorithm.
Claim 11
Independent Claim
57 words
A method for use in multi-carrier equipment, the method comprising the steps of: during a start-up phase, processing at least one carrier of a received multi-carrier data signal by using an automatic gain control element and a rotator; and during a steady-state phase, processing the at least one carrier by using a least mean-square type of algorithm.
Claim 12
Dependent Claim
32 words
The method of claim 8 further comprising the step of changing from the start-up phase to the steady-state phase upon determining that a signal condition is reached for the received multi-carrier signal.
Claim 13
Dependent Claim
11 words
The method of claim 9 wherein the signal condition is event-driven.
Claim 14
Dependent Claim
11 words
The method of claim 9 wherein the signal condition is schedule-driven.
Claim 15
Dependent Claim
109 words
Receiver apparatus comprising: a fast Fourier transform element for providing a plurality of signals, each signal representing a symbol stream; and at least one automatic gain control element and at least one rotator element configured to equalize at least one signal of the plurality of signals, wherein: during a start-up phase, the at least one automatic gain control element and the at least one rotator element are configured to use a first algorithm of operation; and during a steady-state phase, the at least one automatic gain control element and the at least one rotator element are configured to use a second algorithm of operation different from the first algorithm.
Claim 16
Dependent Claim
109 words
Receiver apparatus comprising: a fast Fourier transform element for providing a plurality of signals, each signal representing a symbol stream; and at least one automatic gain control element and at least one rotator element configured to equalize at least one signal of the plurality of signals, wherein: during a start-up phase, the at least one automatic gain control element and the at least one rotator element are configured to use a first algorithm of operation; and during a steady-state phase, the at least one automatic gain control element and the at least one rotator element are configured to use a second algorithm of operation different from the first algorithm.
Claim 17
Dependent Claim
26 words
The receiver apparatus of claim 12 comprising a plurality of automatic gain control and rotator elements, one such element for each of the plurality of signals.
Claim 18
Dependent Claim
17 words
The receiver apparatus of claim 12 wherein the fast Fourier transform element processes a received multi-carrier signal.
Claim 19
Dependent Claim
17 words
The receiver apparatus of claim 14 wherein the received multi-carrier signal is a discrete multi-tone (DMT) signal.
Claim 20
Dependent Claim
19 words
The receiver apparatus of claim 12 wherein the receiver apparatus is for use in asynchronous digital subscriber line equipment.
Claim 21
Dependent Claim
55 words
Apparatus comprising: a hybrid for receiving a multi-carrier signal; and a multi-carrier demodulator for recovering a data signal from the received multi-carrier signal such that the multi-carrier demodulator uses an automatic gain control element and a rotator in place of a complex finite impulse response filter for processing at least one of the received carriers.
Claim 22
Dependent Claim
55 words
Apparatus comprising: a hybrid for receiving a multi-carrier signal; and a multi-carrier demodulator for recovering a data signal from the received multi-carrier signal such that the multi-carrier demodulator uses an automatic gain control element and a rotator in place of a complex finite impulse response filter for processing at least one of the received carriers.
Claim 23
Dependent Claim
14 words
The apparatus of claim 17 wherein the processing is performed during a start-up phase.
Claim 24
Dependent Claim
15 words
The apparatus of claim 17 wherein the multi-carrier signal is a discrete multi-tone (DMT) signal.
Claim 25
Dependent Claim
14 words
The apparatus of claim 17 wherein the apparatus is asynchronous digital subscriber line equipment.
Claim 26
Dependent Claim
72 words
Apparatus comprising: a multi-carrier modulator for transmitting a multi-carrier signal over a transmission medium; and a multi-carrier demodulator for receiving a multi-carrier signal from the transmission medium, wherein the multi-carrier demodulator recovers a data signal from the received multi-carrier signal such that the multi-carrier demodulator uses an automatic gain control element and a rotator in place of a complex finite impulse response filter for processing at least one of the received carriers.
Claim 27
Dependent Claim
72 words
Apparatus comprising: a multi-carrier modulator for transmitting a multi-carrier signal over a transmission medium; and a multi-carrier demodulator for receiving a multi-carrier signal from the transmission medium, wherein the multi-carrier demodulator recovers a data signal from the received multi-carrier signal such that the multi-carrier demodulator uses an automatic gain control element and a rotator in place of a complex finite impulse response filter for processing at least one of the received carriers.
Claim 28
Dependent Claim
16 words
The apparatus of claim 21 wherein the replaced complex finite impulse response filter comprises one tap.
Claim 29
Dependent Claim
14 words
The apparatus of claim 21 wherein the processing is performed during a start-up phase.
Claim 30
Dependent Claim
15 words
The apparatus of claim 21 wherein the multi-carrier signal is a discrete multi-tone (DMT) signal.
Claim 31
Dependent Claim
14 words
The apparatus of claim 21 wherein the apparatus is asynchronous digital subscriber line equipment.
Claim 32
Dependent Claim
75 words
Apparatus comprising: a multi-carrier modulator for transmitting a multi-carrier signal over a transmission medium; and a multi-carrier demodulator for receiving a multi-carrier signal from the transmission medium, wherein, during a start-up phase, the multi-carrier demodulator processes at least one carrier of the received multi-carrier data signal by using an automatic gain control element and a rotator, and, during a steady-state phase, processes the at least one carrier by using a least mean-square type of algorithm.
Claim 33
Dependent Claim
75 words
Apparatus comprising: a multi-carrier modulator for transmitting a multi-carrier signal over a transmission medium; and a multi-carrier demodulator for receiving a multi-carrier signal from the transmission medium, wherein, during a start-up phase, the multi-carrier demodulator processes at least one carrier of the received multi-carrier data signal by using an automatic gain control element and a rotator, and, during a steady-state phase, processes the at least one carrier by using a least mean-square type of algorithm.
Claim 34
Dependent Claim
15 words
The apparatus of claim 26 wherein the multi-carrier signal is a discrete multi-tone (DMT) signal.
Claim 35
Dependent Claim
14 words
The apparatus of claim 26 wherein the apparatus is asynchronous digital subscriber line equipment.
Claim 36
Dependent Claim
31 words
The apparatus of claim 26 wherein the multi-carrier demodulator changes from the start-up phase to the steady-state phase upon determining that a signal condition is reached for the received multi-carrier signal.
Claim 37
Dependent Claim
11 words
The apparatus of claim 29 wherein the signal condition is event-driven.
Claim 38
Dependent Claim
11 words
The apparatus of claim 29 wherein the signal condition is schedule-driven.
Claim 39
Independent Claim
61 words
A method for use in multi-carrier equipment, the method comprising the steps of: during a start-up phase, processing at least one carrier of a received multi-carrier data signal by using an automatic gain control element and a rotator; and during a steady-state phase, processing the at least one carrier by using an automatic gain control element before processing by an equalizer.
Claim 40
Independent Claim
61 words
A method for use in multi-carrier equipment, the method comprising the steps of: during a start-up phase, processing at least one carrier of a received multi-carrier data signal by using an automatic gain control element and a rotator; and during a steady-state phase, processing the at least one carrier by using an automatic gain control element before processing by an equalizer.
Claim 41
Dependent Claim
32 words
The method of claim 32 further comprising the step of changing from the start-up phase to the steady-state phase upon determining that a signal condition is reached for the received multi-carrier signal.
Claim 42
Dependent Claim
11 words
The method of claim 33 wherein the signal condition is event-driven.
Claim 43
Dependent Claim
11 words
The method of claim 33 wherein the signal condition is schedule-driven.
Claim 44
Dependent Claim
20 words
The method of claim 32 further comprising the step of using a least mean-square type of algorithm in the equalizer.
Claim 45
Dependent Claim
97 words
Receiver apparatus comprising: a fast Fourier transform element for providing a plurality of signals, each signal representing a symbol stream, and at least one automatic gain control element configured to control the gain of at least one signal of the plurality of signals before equalization of said signal, wherein: during a start-up phase, the at least one automatic gain control element is configured to use a first algorithm of operation; and during a steady-state phase, the at least one automatic gain control element is configured to use a second algorithm of operation different from the first algorithm.
Claim 46
Dependent Claim
97 words
Receiver apparatus comprising: a fast Fourier transform element for providing a plurality of signals, each signal representing a symbol stream, and at least one automatic gain control element configured to control the gain of at least one signal of the plurality of signals before equalization of said signal, wherein: during a start-up phase, the at least one automatic gain control element is configured to use a first algorithm of operation; and during a steady-state phase, the at least one automatic gain control element is configured to use a second algorithm of operation different from the first algorithm.
Claim 47
Dependent Claim
17 words
The receiver apparatus of claim 37 wherein the fast Fourier transform element processes a received multi-carrier signal.
Claim 48
Dependent Claim
17 words
The receiver apparatus of claim 37 wherein the received multi-carrier signal is a discrete multi-tone (DMT) signal.
Claim 49
Dependent Claim
19 words
The receiver apparatus of claim 37 wherein the receiver apparatus is for use in asynchronous digital subscriber line equipment.
Claim 50
Dependent Claim
87 words
Apparatus comprising: a hybrid for receiving a multi-carrier signal; and a multi-carrier demodulator for recovering a data signal from the received multi-carrier signal such that the multi-carrier demodulator uses an automatic gain control element before equalization of at least one of the received carriers, wherein: during a start-up phase, the automatic gain control element is configured to use a first algorithm of operation; and during a steady-state phase, the automatic gain control element is configured to use a second algorithm of operation different from the first algorithm.
Claim 51
Dependent Claim
87 words
Apparatus comprising: a hybrid for receiving a multi-carrier signal; and a multi-carrier demodulator for recovering a data signal from the received multi-carrier signal such that the multi-carrier demodulator uses an automatic gain control element before equalization of at least one of the received carriers, wherein: during a start-up phase, the automatic gain control element is configured to use a first algorithm of operation; and during a steady-state phase, the automatic gain control element is configured to use a second algorithm of operation different from the first algorithm.
Claim 52
Dependent Claim
15 words
The apparatus of claim 41 wherein the multi-carrier signal is a discrete multi-tone (DMT) signal.
Claim 53
Independent Claim
14 words
The apparatus of claims 41 wherein the apparatus is asynchronous digital subscriber line equipment.
Claim 54
Dependent Claim
79 words
Apparatus comprising: a multi-carrier modulator for transmitting a multi-carrier signal over a transmission medium; and a multi-carrier demodulator for receiving a multi-carrier signal, from the transmission medium, wherein, during a start-up phase, the multi-carrier demodulator processes at least one carrier of the received multi-carrier data signal by using an automatic gain control element and a rotator, and, during a steady-state phase, processing the at least one carrier by using an automatic gain control element before processing by an equalizer.
Claim 55
Dependent Claim
79 words
Apparatus comprising: a multi-carrier modulator for transmitting a multi-carrier signal over a transmission medium; and a multi-carrier demodulator for receiving a multi-carrier signal, from the transmission medium, wherein, during a start-up phase, the multi-carrier demodulator processes at least one carrier of the received multi-carrier data signal by using an automatic gain control element and a rotator, and, during a steady-state phase, processing the at least one carrier by using an automatic gain control element before processing by an equalizer.
Claim 56
Dependent Claim
15 words
The apparatus of claim 44 wherein the multi-carrier signal is a discrete multi-tone (DMT) signal.
Claim 57
Dependent Claim
14 words
The apparatus of claim 44 wherein the apparatus is asynchronous digital subscriber line equipment.
Claim 58
Dependent Claim
31 words
The apparatus of claim 44 wherein the multi-carrier demodulator changes from the start-up phase to the steady-state phase upon determining that a signal condition is reached for the received multi-carrier signal.
Claim 59
Dependent Claim
11 words
The apparatus of claim 47 wherein the signal condition is event-driven.
Claim 60
Dependent Claim
11 words
The apparatus of claim 47 wherein the signal condition is schedule-driven.
Claim 61
Dependent Claim
19 words
The apparatus of claim 44 wherein the multi-carrier demodulator uses a least mean-square type of algorithm in the equalizer.
Claim 62
Dependent Claim
23 words
The method of claim 1 , wherein the first algorithm is an error-driven algorithm and the second algorithm is a least mean-square algorithm.
Claim 63
Dependent Claim
24 words
The receiver apparatus of claim 12 , wherein the first algorithm is an error-driven algorithm and the second algorithm is a least mean-square algorithm.
Claim 64
Dependent Claim
24 words
The receiver apparatus of claim 37 , wherein the first algorithm is an error-driven algorithm and the second algorithm is a least mean-square algorithm.
Claim 65
Dependent Claim
23 words
The apparatus of claim 41 , wherein the first algorithm is an error-driven algorithm and the second algorithm is a least mean-square algorithm.
Claim 66
Dependent Claim
19 words
The method of claim 1 , wherein a single circuit provides both the automatic gain control and rotator functions.
Claim 67
Dependent Claim
19 words
The method of claim 5 , wherein a single circuit provides both the automatic gain control and rotator functions.
Claim 68
Dependent Claim
19 words
The method of claim 8 , wherein a single circuit provides both the automatic gain control and rotator functions.
Claim 69
Dependent Claim
20 words
The receiver apparatus of claim 12 , wherein a single circuit provides both the automatic gain control and rotator functions.
Claim 70
Dependent Claim
19 words
The apparatus of claim 17 , wherein a single circuit provides both the automatic gain control and rotator functions.
Claim 71
Dependent Claim
19 words
The apparatus of claim 21 , wherein a single circuit provides both the automatic gain control and rotator functions.
Claim 72
Dependent Claim
19 words
The apparatus of claim 26 , wherein a single circuit provides both the automatic gain control and rotator functions.
Claim 73
Dependent Claim
19 words
The method of claim 32 , wherein a single circuit provides both the automatic gain control and rotator functions.
Claim 74
Dependent Claim
19 words
The apparatus of claim 44 , wherein a single circuit provides both the automatic gain control and rotator functions.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2005-09-16 | 2006-03-18 | 2006-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-09-16 | 2010-03-18 | 2010-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-09-16 | 2014-03-18 | 2014-09-17 | $7700.00 | Window Closed / Lapsed |