Patent US5740520A successfully refreshed from Google Patents.
US5740520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channel correction transceiver
Assignee: Rafael Advanced Defense Systems Ltd
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Filing: 1996-04-03
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Granted: 1998-04-14
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Expires: 2016-04-03
Abstract
Abstract A transceiver is provided which includes a transmitter for transmitting base band signals at a first operating frequency. The transmitter also includes a lookup table for storing correction coefficients for correcting the base band signals, a pre-distorter for correcting the base band signals and a receiver for receiving the base band signals transmitted by a remote transmitter in a first mode and by the transmitter in a second mode. The receiver includes apparatus for processing the received base band signals, a switching device for switching to the processing apparatus during the first mode and to the incoming signals to the lookup table updater during the second mode. The receiver also includes a lookup table updater, operative during the second mode, for receiving the signals transmitted by the transmitter and for updating the lookup table.
Inventors
- 👤 Baruch Cyze
- 👤 Haim Greenberger
- 👤 Gabriel E. Glassman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:10
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/36; H04L27/366; H04L27/367; H04L27/368; H03; H03F; H03F1/00; H03F1/32; H03F1/3241; H04B; H04B1/00; H04B1/02; H04B1/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
157 words
A transceiver comprising: a. a transmitter for transmitting base band signals at a first operating frequency, said transmitter comprising: I. a lookup table for storing correction coefficients for correcting said base band signals; ii. a pre-distorter for correcting said base band signals; and b. a receiver for receiving base band signals transmitted by a remote transmitter in a first mode and by said transmitter in a second mode, said receiver comprising: I. means for processing said received base band signals; ii a lookup table updater, operative during said second mode for receiving said signals transmitted by said transmitter and for updating said lookup table; and iii. a switching device which receives the base band signals and switches between said means for processing during said first mode and said lookup table updater during said second iii. a lookup table updater, operative during said second mode for receiving said signals transmitted by said transmitter and for updating said lookup.
Claim 2
Dependent Claim
157 words
A transceiver comprising: a. a transmitter for transmitting base band signals at a first operating frequency, said transmitter comprising: I. a lookup table for storing correction coefficients for correcting said base band signals; ii. a pre-distorter for correcting said base band signals; and b. a receiver for receiving base band signals transmitted by a remote transmitter in a first mode and by said transmitter in a second mode, said receiver comprising: I. means for processing said received base band signals; ii a lookup table updater, operative during said second mode for receiving said signals transmitted by said transmitter and for updating said lookup table; and iii. a switching device which receives the base band signals and switches between said means for processing during said first mode and said lookup table updater during said second iii. a lookup table updater, operative during said second mode for receiving said signals transmitted by said transmitter and for updating said lookup.
Claim 3
Dependent Claim
26 words
The transceiver according to claim 1 and wherein said base band signals transmitted by said remote transmitter in said first mode have a second operating frequency.
Claim 4
Dependent Claim
25 words
The transceiver according to claim 1 and wherein said base band signals transmitted by said transmitter in said second mode have a first operating frequency.
Claim 5
Dependent Claim
57 words
The transceiver according to claim 1 and wherein said transmitter further comprises: a. a variable attentuator for controlling the power output of said base band signals; and b. a power output level measurer for measuring said power output and for providing said base band signals to said pre-distorter only when said power output level exceeds pre-determined levels.
Claim 6
Dependent Claim
27 words
The transceiver according to claim 1 and wherein said receiver further comprises a band pass filter centered to said base band signals transmitted by said remote transmitter.
Claim 7
Dependent Claim
15 words
The transceiver according to claim 1 and wherein said means for processing comprises a modem.
Claim 8
Dependent Claim
26 words
The transceiver according to claim 1 and wherein said pre-distorter comprises a shaping filter for filtering the in-phase and quadratic components of said base band signals.
Claim 9
Dependent Claim
42 words
The transceiver according to claim 7 and wherein said pre-distorter further comprises an error extractor unit for processing said filtered in-phase and quadratic components of said base band signals and for ascertaining the correction coefficients for adjusting said in-phase and quadratic components.
Claim 10
Dependent Claim
91 words
A transceiver comprising: a. a transmitter for transmitting base band signals, said transmitter comprising: i. a lookup table for storing correction coefficients for correcting said base band signals; ii. a pre-distorter for correcting said base band signals; iii. a variable attentuator for controlling the power output of said base band signals; iv. a power output level measurer for measuring said power output and for providing said base band signals to said pre-distorter only when said power output level exceeds pre-determined levels; and b. a receiver for receiving transmitted base band signals.
Claim 11
Dependent Claim
91 words
A transceiver comprising: a. a transmitter for transmitting base band signals, said transmitter comprising: i. a lookup table for storing correction coefficients for correcting said base band signals; ii. a pre-distorter for correcting said base band signals; iii. a variable attentuator for controlling the power output of said base band signals; iv. a power output level measurer for measuring said power output and for providing said base band signals to said pre-distorter only when said power output level exceeds pre-determined levels; and b. a receiver for receiving transmitted base band signals.
Claim 12
Dependent Claim
26 words
The transceiver according to claim 9 and wherein said pre-distorter comprises a shaping filter for filtering the in-phase and quadratic components of said base band signals.
Claim 13
Dependent Claim
42 words
The transceiver according to claim 10 and wherein said pre-distorter further comprises an error extractor unit for processing said filtered inphase and quadratic components of said base band signals and for ascertaining the correction coefficients for adjusting said in-phase and quadratic components.
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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) | 2001-04-13 | 2001-10-13 | 2002-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-13 | 2005-10-13 | 2006-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-13 | 2009-10-13 | 2010-04-14 | $7700.00 | Window Closed / Lapsed |