US5675616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for use in equipment providing a digital radio link between a fixed and a mobile radio unit
Assignee: Nokia Solutions and Networks GmbH and Co KG
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Filing: 1995-09-28
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Granted: 1997-10-07
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Expires: 2015-09-28
Abstract
Abstract For a Rake receiver in which the received signal is sampled at only one sample per chip, the signal is energy collected from several multipath components by the Rake fingers. If any multipath component is not perfectly aligned with the sampling time, several Rake fingers will be needed to collect its energy. If the number of Rake fingers available is limited, then more efficient collection of energy is possible if fine timing correction is applied to the sampling so that optimum sampling is applied to the strongest multipath component. In this way, only one Rake finger is required and the other Rake fingers may be dedicated to the remaining multipath components. The present invention uses two types of control methods, a Tau dither phase control circuit or a pilot jitter clock circuit. The control circuit generates control signals for the various Rake fingers and also controls a clock phase adjuster which in turn controls a sample and hold circuit which receives the analog complex baseband input signal which is fed via an analog-to-digital converter into a complex shift register, each stage of which is connected to each Rake finger and is selectable by each Rake finger.
Inventors
- 👤 Anthony Peter Hulbert
- 👤 Alfred Michael Krumpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:12
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/711; H04B1/7115; H04B1/7117
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
A Rake receiver for use in equipment providing a digital radio link between a fixed and a mobile radio unit, comprising: a sample and hold circuit for receiving an analog complex baseband signal; an analog-to-digital converter connected to an output of the sample and hold circuit; an output of the analog-to-digital converter connecting to a shift register; outputs of the shift register connecting to a plurality of Rake fingers, each Rake finger having means for selectively receiving contents of each bit of said shift register; and a control means for receiving outputs from said Rake fingers and for providing an output to a clock phase adjuster circuit for creating a control signal connected to said sample and hold circuit.
Claim 2
Dependent Claim
119 words
A Rake receiver for use in equipment providing a digital radio link between a fixed and a mobile radio unit, comprising: a sample and hold circuit for receiving an analog complex baseband signal; an analog-to-digital converter connected to an output of the sample and hold circuit; an output of the analog-to-digital converter connecting to a shift register; outputs of the shift register connecting to a plurality of Rake fingers, each Rake finger having means for selectively receiving contents of each bit of said shift register; and a control means for receiving outputs from said Rake fingers and for providing an output to a clock phase adjuster circuit for creating a control signal connected to said sample and hold circuit.
Claim 3
Dependent Claim
27 words
A Rake receiver according to claim 1 wherein each Rake finger includes a pilot correlator from which said respective output signal to said control means is generated.
Claim 4
Dependent Claim
18 words
A Rake receiver according to claim 1 wherein said control means comprises a Tau dither phase control circuit.
Claim 5
Dependent Claim
67 words
A Rake receiver according to claim 3 wherein said Tau dither control circuit comprises integration means for averaging signal power over an interval of time on each input line to the control means, means for selecting a larger signal, means for alternately adding and subtracting said selected signal into a further integrator, and means for adding a Dither signal to an output signal of said further integrator.
Claim 6
Dependent Claim
18 words
A Rake receiver according to claim 1 wherein said control means comprises a pilot jitter phase control circuit.
Claim 7
Dependent Claim
60 words
An apparatus according to claim 5 wherein said Dither phase control circuit includes integration means for averaging signal power over an interval of time on each input line to the control means, means for selecting a larger signal, and means for alternately adding and subtracting said selected signal into a further integrator under control of a pilot jitter clock signal.
Claim 8
Dependent Claim
138 words
A Rake receiver for use in equipment providing a digital radio link between a fixed and a mobile radio unit, comprising: a sample and hold circuit for receiving an analog complex baseband signal; an analog-to-digital converter connected to an output of the sample and hold circuit; an output of the analog-to-digital converter connecting to a shift register; outputs of the shift register connecting to a plurality of Rake fingers, each Rake finger having a selectable switch selectively receiving contents of each bit of said shift register; a control unit for receiving outputs from said Rake fingers and for providing an output to a clock phase adjuster circuit for creating a control signal connected to said sample and hold circuit; and outputs of the Rake fingers being connected to an adder for providing demodulated data at an output thereof.
Claim 9
Dependent Claim
138 words
A Rake receiver for use in equipment providing a digital radio link between a fixed and a mobile radio unit, comprising: a sample and hold circuit for receiving an analog complex baseband signal; an analog-to-digital converter connected to an output of the sample and hold circuit; an output of the analog-to-digital converter connecting to a shift register; outputs of the shift register connecting to a plurality of Rake fingers, each Rake finger having a selectable switch selectively receiving contents of each bit of said shift register; a control unit for receiving outputs from said Rake fingers and for providing an output to a clock phase adjuster circuit for creating a control signal connected to said sample and hold circuit; and outputs of the Rake fingers being connected to an adder for providing demodulated data at an output thereof.
References Cited (Backward Citations)
US4965808A
Cited
US5077754A
Cited
US5590160A
Cited
GB2278983A
Cited
US5594755A
Cited
US5361276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-10-06 | 2001-04-07 | 2001-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-06 | 2005-04-07 | 2005-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-06 | 2009-04-07 | 2009-10-07 | $7700.00 | Window Closed / Lapsed |