EP0465851A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
QAM receiver compensating both linear and non-linear distortion
Assignee: Nokia Oyj
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Filing: 1991-06-11
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Granted: —
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Expires: 2011-06-11
Abstract
Abstract The invention relates to an adaptive receiving method and a receiver comprising an adaptive equalizing device (1) for processing a received signal. The receiver further comprises an adaptive detector (2, 3) utilizing the self-organizing map principle and operationally connected after the adaptive equalizer (1). The adaptive equalizer (1) is controlled on the basis of an error between a processed signal (y(n)) and a detected signal (y'(n)-).
Inventors
- 👤 Jukka Henriksson
- 👤 Kimmo Raivio
- 👤 Teuvo Kohonen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 21:17
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/38; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L2025/0335; H04L2025/03375; H04L2025/0342; H04L2025/03433; H04L2025/03439; H04L2025/03445; H04L2025/03471; H04L2025/03477; H04L2025/03592; H04L2025/03598; H04L2025/03611
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
78 words
Method of receiving discrete signals, comprising processing a received discrete signal prior to detection to compensate for distortion caused by the transmission channel, characterized in that the processed discrete signal is detected by an adaptive detection method based on a self-organizing map and the distortion compensation to be performed prior to detection is controlled on the basis of an error between an instantaneous signal sample of the processed signal and a signal constellation formed by the self-organizing map.
Claim 2
Dependent Claim
78 words
Method of receiving discrete signals, comprising processing a received discrete signal prior to detection to compensate for distortion caused by the transmission channel, characterized in that the processed discrete signal is detected by an adaptive detection method based on a self-organizing map and the distortion compensation to be performed prior to detection is controlled on the basis of an error between an instantaneous signal sample of the processed signal and a signal constellation formed by the self-organizing map.
Claim 3
Dependent Claim
34 words
Receiving method according to claim 1, characterized in that the signal constellation formed by the self-organizing map and to be used in the detection is corrected on the basis of the unprocessed, received signal.
Claim 4
Dependent Claim
34 words
Receiving method according to claim 1, characterized in that the signal constellation formed by the self-organizing map and to be used in the detection is corrected on the basis of the processed, received signal.
Claim 5
Dependent Claim
24 words
Receiving method according to claim 1, 2 or 3, characterized in that the self-organizing map and the signal constellation formed by it are multi-dimensional.
Claim 6
Dependent Claim
41 words
Receiving method according to any of the preceding claims, characterized in that the calculation of the tap coefficients of a linear or non-linear transversal equalizer is controlled by means of said error using a gradient method or a zero compression method.
Claim 7
Dependent Claim
22 words
Receiving method according to any of the preceding claims, characterized in that a decision-feedback equalizer is controlled by means of said error.
Claim 8
Dependent Claim
64 words
Receiver comprising an adaptive equalizing device (1) for processing a received signal, characterized in that the receiver comprises an adaptive detecting means (2, 3) utilizing the self-organizing map principle and operationally connected after the adaptive equalizer (1), and that the adaptive equalizer (1) is arranged to be controlled on the basis of an error between a processed signal (y(n)) and a detected signal (y'(n)).
Claim 9
Dependent Claim
64 words
Receiver comprising an adaptive equalizing device (1) for processing a received signal, characterized in that the receiver comprises an adaptive detecting means (2, 3) utilizing the self-organizing map principle and operationally connected after the adaptive equalizer (1), and that the adaptive equalizer (1) is arranged to be controlled on the basis of an error between a processed signal (y(n)) and a detected signal (y'(n)).
Claim 10
Dependent Claim
37 words
Receiver according to claim 7, characterized in that the detecting means (2, 3) is responsive to the unprocessed, received signal to correct the signal constellation used in the detection by a method based on a self-organizing map.
Claim 11
Dependent Claim
40 words
Receiver according to claim 7, characterized in that the detecting means (2, 3) is responsive to the signal processed by the equalizer device to correct the signal constellation used in the detection by a method based on a self-organizing map.
Claim 12
Dependent Claim
38 words
Receiver according to claim 7, characterized in that the detecting means is selectively responsive to the processed or unprocessed received signal to correct the signal constellation used in the detection by a method based on a self-organizing map.
Claim 13
Dependent Claim
34 words
Receiver according to any of claims 7 to 10, characterized in that the received signal is a QAM signal, and that the self-organizing map of the detecting means and the signal constellation are multi-dimensional.
Claim 14
Dependent Claim
26 words
Receiver according to any of claims 7 to 11, characterized in that the adaptive equalizer comprises a linear or non-linear transversal equalizer and/or a decision-feedback equalizer.
Claim 15
Dependent Claim
19 words
Receiver according to any of claims 7 to 12, characterized in that it comprises a decision-feedback equalizer (14, 15).
References Cited (Backward Citations)
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