Patent EP0332290A2 successfully refreshed from Google Patents.
EP0332290A2
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EP
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Equaliser for radio receiver
Assignee: Orbitel Mobile Communications Ltd
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Filing: 1989-02-03
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Granted: —
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Expires: 2009-02-03
Abstract
Abstract A GMSK radio receiver for operation in the presence of strong multipath interference, comprising a baseband frequency converter which operates so as to produce I and Q baseband GMSK signals, which will be distorted by any multipath interference present, which are correlated with a plurality of different possible signals to afford in respect of each correlation a probability signal, the probability signals being processed to determine the significance of the signal received, whereby the transmitted data is determined in the presence of multipath interference.
Inventors
- 👤 Stephen Wiliam Wales
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 05:48
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03178; H04L25/03184; H04L2025/0335; H04L2025/03375; H04L2025/03401; H04L2025/03407
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
An equaliser, for a radio receiver, comprising a converter for producing, from a received signal, digital samples at baseband, means for providing an estimate of channel distortion in the received signal, a store in which are stored signal sets, means for applying the distortion estimate to the stored signal sets, metric generating means for generating metrics of selected modulated signal sets with the digital samples and a processor for processing the generated metrics in accordance with a Viterbi algorithm to determine the most probable value of the received signal.
Claim 2
Dependent Claim
89 words
An equaliser, for a radio receiver, comprising a converter for producing, from a received signal, digital samples at baseband, means for providing an estimate of channel distortion in the received signal, a store in which are stored signal sets, means for applying the distortion estimate to the stored signal sets, metric generating means for generating metrics of selected modulated signal sets with the digital samples and a processor for processing the generated metrics in accordance with a Viterbi algorithm to determine the most probable value of the received signal.
Claim 3
Dependent Claim
40 words
An equaliser as claimed in claim 1 wherein the means for producing an estimate of channel distortion includes means for comparing a known data sequence, received as a distorted signal, with the known sequence and for deriving the estimate therefrom.
Claim 4
Dependent Claim
25 words
An equaliser as claimed in claim 1 or 2 wherein the stored signal sets are 5-bit sequences representing averaged values of all possible 7-bit sequences.
Claim 5
Dependent Claim
49 words
An equaliser as claimed in claim 3 including a state path store and means for selecting a sub-set of sixteen of stored signal sets which differ only in the symbol a m-4 , for use in generating the metrics, in dependance upon the contents of the state path store.
Claim 6
Dependent Claim
30 words
An equaliser as claimed in any preceding claim path store also provides a selection, in dependence upon the symbol a m-3 , to reduce the equaliser to an 8-state equaliser.
Claim 7
Dependent Claim
16 words
An equaliser, for a radio receiver, substantially as hereinbefore described with reference to the accompanying drawings.
Claim 8
Dependent Claim
16 words
An equaliser, for a radio receiver, substantially as hereinbefore described with reference to the accompanying drawings.
References Cited (Backward Citations)
No citation records indexed.
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