EP0419225A2
Expired / Lapsed
EP
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Transversal type automatic equalizer with tap coefficient protection
Assignee: Fujitsu Ltd
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Filing: 1990-09-19
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Granted: —
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Expires: 2010-09-19
Abstract
Abstract A system of the transversal type automatic equalizer with a tap coefficient protection in which inter-symbol interference is prevented includes a summing unit (51) for summing all of the tap powers detected by a tap power detecting unit (41, 42, ... 4n), and a determination unit (52) for comparing the sum produced by the summing unit (51) with a predetermined threshold value, and for producing the output determination of normal when the sum is not more than the threshold value and producing the output determination of alnormal tap coefficient growth when the sum is more than the threshold value.
Inventors
- 👤 Takashi Kaku
- 👤 Hiroki Kishimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 16:52
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03038; H04L25/03044
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A system of the transversal type automatic equalizer with a tap coefficient protection in which an inter-symbol interference is prevented, characterized in that said system comprises: tap power detecting means (41, 42, ... 4n) for detecting the tap power of each of said tap coefficients; summing means (51) for summing all of the tap powers detected by said tap power detecting means; and determination means (52) for comparing the sum produced by said summing means with a predetermined threshold value, and for producing the output determination of normal when the sum is not more than the threshold value and producing the output determination of abnormal tap coefficient growth when the sum is more than the threshold value.
Claim 2
Independent Claim
117 words
A system of the transversal type automatic equalizer with a tap coefficient protection in which an inter-symbol interference is prevented, characterized in that said system comprises: tap power detecting means (41, 42, ... 4n) for detecting the tap power of each of said tap coefficients; summing means (51) for summing all of the tap powers detected by said tap power detecting means; and determination means (52) for comparing the sum produced by said summing means with a predetermined threshold value, and for producing the output determination of normal when the sum is not more than the threshold value and producing the output determination of abnormal tap coefficient growth when the sum is more than the threshold value.
Claim 3
Dependent Claim
85 words
A system according to claim 1, further comprising tap control means (53) for controlling the tap coefficients to remain as they are when the output determination of normal is produced by said determination means, and controlling by multiplying each of the tap coefficients by a predetermined multiplication coefficient which is a little less than unity or by directing to the original point when the output determination of abnormal tap coefficient growth is produced by said determination means, thereby suppressing the gain of the automatic equalizer.
Claim 4
Dependent Claim
40 words
A system according to claim 2, wherein, for said predetermined multiplication coefficient, a value which is a little less than unity and able to maintain the deterioration of signal-to-noise error rate to at least less than 0.1 dB, is used.
Claim 5
Dependent Claim
24 words
A system according to claim 1, 2 or 3, wherein the transversal type automatic equalizer has a sampling rate less than a symbol rate.
Claim 6
Independent Claim
24 words
A system according to any preceding claim, wherein the usual gain of the transversal type automatic equalizer is adopted as said predetermined threshold value.
Claim 7
Independent Claim
31 words
A system according to any of claims 1 to 4, wherein a value more than the usual gain of the transversal type automatic equalizer is adopted as said predetermined threshold value.
References Cited (Backward Citations)
No citation records indexed.
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