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US5937014A
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Self-synchronizing equalization techniques and systems
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1997-03-27
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Granted: 1999-08-10
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Expires: 2017-03-27
Abstract
Abstract Methods and systems for processing received radio signals are described wherein the finite alphabet quality of digital transmissions is utilized to improve performance. Nonsynchronous sampling of received signals introduces intersymbol interference which is compensated for by these methods and systems. Different types of signal modulation, and their impact on this type of intersymbol interference are discussed. A robust diversity combining technique, usable in conjunction with antenna arrays is developed.
Inventors
- 👤 Per Pelin
- 👤 Soren Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:04
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/711; H04B1/7115; H04B1/7073; H04L; H04L25/00; H04L25/02; H04L25/0202; H04L25/024; H04L25/025; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03178; H04L25/03248; H04L25/0328; H04B1/712; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/7097; H04B2201/709727; H04L2025/0335; H04L2025/03375; H04L2025/03401
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A method for processing a signal received in a radiocommunication system comprising the steps of: (a) sampling said received signal, whereby intersymbol interference is introduced into said received signal; (b) generating at least one channel estimate and an associated signal sample estimate associated with said received signal; (c) estimating said introduced intersymbol interference; (d) updating said at least one channel estimate and said associated signal sample estimate associated with said received signal using said estimated introduced intersymbol interference; (e) repeating steps (b), (c) and (d) for a predetermined number of iterations; and (f) outputting said channel estimate and an associated signal sample estimate.
Claim 2
Independent Claim
103 words
A method for processing a signal received in a radiocommunication system comprising the steps of: (a) sampling said received signal, whereby intersymbol interference is introduced into said received signal; (b) generating at least one channel estimate and an associated signal sample estimate associated with said received signal; (c) estimating said introduced intersymbol interference; (d) updating said at least one channel estimate and said associated signal sample estimate associated with said received signal using said estimated introduced intersymbol interference; (e) repeating steps (b), (c) and (d) for a predetermined number of iterations; and (f) outputting said channel estimate and an associated signal sample estimate.
Claim 3
Dependent Claim
20 words
The method of claim 1, wherein said step of sampling further comprises the step of: nonsynchronously sampling said received signal.
Claim 4
Dependent Claim
30 words
The method of claim 1, wherein said step of repeating further comprises: performing, as said predetermined number of iterations, iterations until a value associated with said signal sample estimate converges.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein said at least one channel estimate is generated using a decoupled weighted iterative least squares with projections (DWILSP) algorithm.
Claim 6
Dependent Claim
32 words
The method of claim 1, wherein said step of estimating further comprises the step of: estimating said introduced intersymbol interference based on a type of modulation used to modulate said received signal.
Claim 7
Independent Claim
110 words
A system for processing a radio signal comprising: means for sampling said radio signal, whereby intersymbol interference is introduced into said received signal; means for generating at least one channel estimate and an associated signal sample estimate associated with said received signal; means for estimating said introduced intersymbol interference; means for updating said at least one channel estimate and said associated signal sample estimate associated with said received signal using said estimated introduced intersymbol interference; means for iteratively applying said means for estimating and said means for updating for a predetermined number of iterations; and means for outputting said at least one channel estimate and said associated signal sample estimate.
Claim 8
Independent Claim
110 words
A system for processing a radio signal comprising: means for sampling said radio signal, whereby intersymbol interference is introduced into said received signal; means for generating at least one channel estimate and an associated signal sample estimate associated with said received signal; means for estimating said introduced intersymbol interference; means for updating said at least one channel estimate and said associated signal sample estimate associated with said received signal using said estimated introduced intersymbol interference; means for iteratively applying said means for estimating and said means for updating for a predetermined number of iterations; and means for outputting said at least one channel estimate and said associated signal sample estimate.
Claim 9
Dependent Claim
19 words
The system of claim 6, wherein said means for sampling further comprises: means for nonsynchronously sampling said radio signal.
Claim 10
Dependent Claim
30 words
The method of claim 6, wherein said step of repeating further comprises: performing, as said predetermined number of iterations, iterations until a value associated with said signal sample estimate converges.
Claim 11
Dependent Claim
25 words
The method of claim 6 wherein said at least one channel estimate is generated using a decoupled weighted iterative least squares with projections (DWILSP) algorithm.
Claim 12
Dependent Claim
31 words
The system of claim 6, wherein said means for estimating further comprises: means for estimating said introduced intersymbol interference based on a type of modulation used to modulate said received signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-08-09 | 2003-02-08 | 2003-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-09 | 2007-02-08 | 2007-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-09 | 2011-02-08 | 2011-08-10 | $7700.00 | Window Closed / Lapsed |