EP0496152A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Viterbi equaliser with variable number of states
Assignee: Roke Manor Research Ltd
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Filing: 1991-10-21
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Granted: —
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Expires: 2011-10-21
Abstract
Abstract An equaliser of the kind using a Viterbi algorithm for signal processing to reduce the effects of multipath interference, comprising means for measuring multipath interference duration, signal processor means operative in accordance with a Viterbi algorithm having a selected number of states, and means for adapting the number of states in dependence upon multipath interference duration as measured.
Inventors
- 👤 Patrick Hugh Waters
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:09
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03178; H04L25/03248; H04L25/03292; H04L25/0202; H04L25/0212; H04L25/0216
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
An equaliser of the kind using a Viterbi algorithm for signal processing to reduce the effects of multipath interference, characterised by means (2) for measuring multipath interference duration, signal processor means (19) operative in accordance with a Viterbi algorithm having a selected number of states, and means (4) for adapting the number of states in dependence upon multipath interference duration as measured.
Claim 2
Dependent Claim
62 words
An equaliser of the kind using a Viterbi algorithm for signal processing to reduce the effects of multipath interference, characterised by means (2) for measuring multipath interference duration, signal processor means (19) operative in accordance with a Viterbi algorithm having a selected number of states, and means (4) for adapting the number of states in dependence upon multipath interference duration as measured.
Claim 3
Dependent Claim
115 words
An equaliser as claimed in claim 1, wherein the means for measuring multipath interference duration comprises a measurement unit (2) and the means for adapting the number of states is a windowing unit (4), and wherein the signal processor means (19) comprises a trellis processor (9) and a branch metrics calculator (17), the windowing unit (4) being responsive to the measuring unit (2) for providing a control signal derived in accordance with measured multipath interference duration, which control signal is utilised to adapt the number of branch metrics and the number of states in the Viterbi algorithm of the trellis processor (9) whereby the computational load is varied in dependence upon the multipath interference duration.
Claim 4
Dependent Claim
56 words
An equaliser as claimed in claim 2, wherein a reference signal generator (5) is provided which is arranged to be responsive to the windowing unit (4), which said reference signal generator feeds the branch metrics calculator (17) and the trellis processor (9), the number or reference signals generated being adapted in accordance with multipath interference duration.
Claim 5
Dependent Claim
29 words
An equaliser as claimed in claim 3, wherein signals fed to the measurement unit (2) are fed also to the branch metrics calculator (17) via a buffer store (3).
Claim 6
Dependent Claim
75 words
An equaliser as claimed in claim 4, wherein the trellis processor (9) comprises a metrics accumulator (12) fed from the metrics calculator (17), an accumulated metrics store (10) which feeds the metrics accumulator (12) and a comparator unit (11) which is responsive to the metrics accumulator (12) for updating the accumulated metrics store (10) and for providing a signal for a path store (13) which in turn provides an output signal from the trellis processor(9).
References Cited (Backward Citations)
No citation records indexed.
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