EP0436101A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Maximum-likelihood sequence estimation apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1990-11-19
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Granted: —
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Expires: 2010-11-19
Abstract
Abstract A maximum-likelihood sequence estimation apparatus supplied with a received signal for outputting data in accordance with a state selected on the basis of an estimated maximum-likelihood sequence. The apparatus comprises a plurality of channel characteristics estimation circuits provided for respective states and respectively supplying estimated values of channel characteristics for different states to a maximum-likelihood sequence estimation circuit.
Inventors
- 👤 Hiroshi C/O Tsushin System Kenkyusho Of Kubo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 14:34
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03178; H04L25/03337; H04L1/00; H04L1/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A maximum-likelihood sequence estimation apparatus supplied with a received signal and outputting data in accordance with a state selected on the basis of an estimated maximum-likelihood sequence, comprising: first means supplied with a received signal and estimated values of channel characteristics for respective states which are a combination of possibly occurring data of a presently received signal so as to estimate a maximum-likelihood sequence using the estimated values of channel characteristics to output survivor sequences for the respective states; and second means responsive to the received signal and the survivor sequences for the respective states output from the first means for outputting the estimated values of channel characteristics for the respective states.
Claim 2
Dependent Claim
112 words
A maximum-likelihood sequence estimation apparatus supplied with a received signal and outputting data in accordance with a state selected on the basis of an estimated maximum-likelihood sequence, comprising: first means supplied with a received signal and estimated values of channel characteristics for respective states which are a combination of possibly occurring data of a presently received signal so as to estimate a maximum-likelihood sequence using the estimated values of channel characteristics to output survivor sequences for the respective states; and second means responsive to the received signal and the survivor sequences for the respective states output from the first means for outputting the estimated values of channel characteristics for the respective states.
Claim 3
Dependent Claim
89 words
The apparatus as set forth in Claim 1 wherein said second means comprises: a control means receiving the survivor sequences from said first means and the estimated values of channel characteristics for the respective states so as to output the survivor sequences for the respective states and estimated values of previous channel characteristics determined in accordance with the survivor sequences; and channel characteristics estimation circuits responsive to the received signal and the outputs of said control circuit to output the estimated values of channel characteristics for the respective states.
Claim 4
Dependent Claim
117 words
A maximum-likelihood sequence estimation apparatus supplied with a received signal and outputting data in accordance with a state selected on the basis of an estimated maximum-likelihood sequence, comprising: maximum-likelihood sequence estimation means supplied with a received signal and estimated values of channel characteristics for respective states which are a combination of possibly occurring data of a presently received signal so as to estimate a maximum-likelihood sequence using the estimated values of channel characteristics to output survivor sequences for the respective states; and channel characteristics estimation means receiving a received signal and the survivor sequences for the respective states output from said maximum-likelihood sequence estimation means for outputting the estimated values of channel characteristics for the respective states.
Claim 5
Dependent Claim
117 words
A maximum-likelihood sequence estimation apparatus supplied with a received signal and outputting data in accordance with a state selected on the basis of an estimated maximum-likelihood sequence, comprising: maximum-likelihood sequence estimation means supplied with a received signal and estimated values of channel characteristics for respective states which are a combination of possibly occurring data of a presently received signal so as to estimate a maximum-likelihood sequence using the estimated values of channel characteristics to output survivor sequences for the respective states; and channel characteristics estimation means receiving a received signal and the survivor sequences for the respective states output from said maximum-likelihood sequence estimation means for outputting the estimated values of channel characteristics for the respective states.
Claim 6
Dependent Claim
92 words
The apparatus as set forth in Claim 3 wherein said maximum-likelihood sequence estimation means includes: a maximum-likelihood sequence estimation circuit supplied with the received signal and the estimated values of channel characteristics for the respective states; and a control circuit receiving the survivor sequences from said maximum-likelihood sequence estimation circuit and the estimated values of channel characteristics for the respective states from said channel characteristics estimation means so as to output the survivor sequences for the respective states and estimated values of previous channel characteristics determined in accordance with the survivor sequences.
Claim 7
Dependent Claim
60 words
The apparatus as set forth in Claim 4 wherein said channel characteristics estimation means comprises estimation circuits, the number of which is equal to the number of the respective states, and wherein said estimation circuits are responsive to the received signal and the outputs of said control circuit to output the estimated values of channel characteristics for the respective states.
Claim 8
Dependent Claim
174 words
A maximum-likelihood sequence estimation apparatus supplied with a received signal and outputting data in accordance with a state selected on the basis of an estimated maximum-likelihood sequence, comprising: a maximum-likelihood sequence estimation circuit supplied with a received signal and estimated values of channel characteristics for respective states which are a combination of possibly occurring data of a received signal so as to estimate a maximum-likelihood sequence using the estimated values of channel characteristics to output survivor sequences for the respective states; a control circuit receiving the survivor sequences from said maximum-likelihood sequence estimation circuit and the estimated values of channel characteristics for the respective states to output the survivor sequences for the respective states and estimated values of previous channel characteristics determined in accordance with the survivor sequences; and channel characteristics estimation circuits responsive to the received signal and the outputs of said control circuit to output the estimated values of channel characteristics for the respective states, the number of said channel characteristics estimation circuits being equal to the number of the respective states.
Claim 9
Dependent Claim
174 words
A maximum-likelihood sequence estimation apparatus supplied with a received signal and outputting data in accordance with a state selected on the basis of an estimated maximum-likelihood sequence, comprising: a maximum-likelihood sequence estimation circuit supplied with a received signal and estimated values of channel characteristics for respective states which are a combination of possibly occurring data of a received signal so as to estimate a maximum-likelihood sequence using the estimated values of channel characteristics to output survivor sequences for the respective states; a control circuit receiving the survivor sequences from said maximum-likelihood sequence estimation circuit and the estimated values of channel characteristics for the respective states to output the survivor sequences for the respective states and estimated values of previous channel characteristics determined in accordance with the survivor sequences; and channel characteristics estimation circuits responsive to the received signal and the outputs of said control circuit to output the estimated values of channel characteristics for the respective states, the number of said channel characteristics estimation circuits being equal to the number of the respective states.
References Cited (Backward Citations)
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