US5119508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Predictive AGC in TDM systems
Assignee: Motorola Solutions Inc
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Filing: 1990-01-18
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Granted: 1992-06-02
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Expires: 2010-01-18
Abstract
Abstract In a communication system having a time base for system synchronization, there is provided a method and apparatus for controlling the sensitivity of a receiver comprising the steps of (a) receiving a signal that was predeterminally transmitted by another relative to the time base (wherein signal reception is confirmed when the amplitude of the received signal exceeds a pre-established threshold), (b) determining signal transit time from the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, (c) controlling the sensitivity of the receiver as a function of the transit time by: (1) increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at maximum range (maximum expected transit time) and (2) nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
Inventors
- 👤 H. N. Shamasundara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:53
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/14
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
67 words
In a communications system having a time base for system synchronization, a method of controlling receiver sensitivity comprising: receiving a signal that was predeterminally transmitted by a transmitter relative to the time base, determining the difference in time between the instant of signal transmission by the transmitter and the instant of signal reception by the receiver, and controlling the receiver sensitivity as a function that time difference.
Claim 2
Dependent Claim
67 words
In a communications system having a time base for system synchronization, a method of controlling receiver sensitivity comprising: receiving a signal that was predeterminally transmitted by a transmitter relative to the time base, determining the difference in time between the instant of signal transmission by the transmitter and the instant of signal reception by the receiver, and controlling the receiver sensitivity as a function that time difference.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1, wherein the sensitivity controlling comprises adjusting receiver gain as a function of that time difference.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 1, wherein the sensitivity controlling comprises increasing the gain of the receiver with increasing time difference.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, further comprising adjusting the gain for local propagation conditions.
Claim 6
Dependent Claim
15 words
A method as claimed in claim 4, comprising adjusting the gain for local terrain conditions.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 1, wherein the signal reception is confirmed when the amplitude of the received signal exceeds a pre-established threshold.
Claim 8
Dependent Claim
127 words
In a communications system having a time base for system synchronization, a method of controlling receiver sensitivity comprising: receiving a signal that was predeterminally transmitted by another relative to the time base wherein signal reception is confirmed when the amplitude of the received signal exceeds a pre-established threshold, determining the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, controlling receiver sensitivity as a function of that time difference by: increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at the maximum expected time difference and nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
Claim 9
Dependent Claim
127 words
In a communications system having a time base for system synchronization, a method of controlling receiver sensitivity comprising: receiving a signal that was predeterminally transmitted by another relative to the time base wherein signal reception is confirmed when the amplitude of the received signal exceeds a pre-established threshold, determining the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, controlling receiver sensitivity as a function of that time difference by: increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at the maximum expected time difference and nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
Claim 10
Dependent Claim
84 words
In a communications system having a time base for system synchronization, a receiver comprising: means for receiving a signal that was predeterminally transmitted by another relative to the time base, means, coupled to the receiving means, for determining the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, and means, coupled to the determining means, for controlling the sensitivity of the receiver as a function of that time difference.
Claim 11
Dependent Claim
84 words
In a communications system having a time base for system synchronization, a receiver comprising: means for receiving a signal that was predeterminally transmitted by another relative to the time base, means, coupled to the receiving means, for determining the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, and means, coupled to the determining means, for controlling the sensitivity of the receiver as a function of that time difference.
Claim 12
Dependent Claim
28 words
A receiver as claimed in claim 9, wherein the sensitivity controlling means comprises means for adjusting the gain of the receiver as a function of that time difference.
Claim 13
Dependent Claim
24 words
A receiver as claimed in claim 8, further comprising means, coupled to the sensitivity control means, for adjusting the gain for local propagation conditions.
Claim 14
Dependent Claim
28 words
A receiver as claimed in claim 10, wherein the calibrating means further comprises means, coupled to the sensitivity control means, for adjusting the gain for local terrain conditions.
Claim 15
Dependent Claim
23 words
A receiver as claimed in claim 8, wherein signal reception is confirmed when the amplitude of the received signal exceeds a pre-established threshold.
Claim 16
Dependent Claim
156 words
In a communications system having a time base for system synchronization, a receiver comprising: means for receiving a signal that was predeterminally transmitted by another relative to the time base wherein signal reception is confirmed when the amplitude of the received signal exceeds a pre-established threshold, means, coupled to the receiving means, for determining signal transit time from the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, means, coupled to the determining means, for controlling the sensitivity of the receiver as a function of the transit time comprising: means for increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at the maximum expected transit time and means, coupled to the gain adjusting means, for nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
Claim 17
Dependent Claim
156 words
In a communications system having a time base for system synchronization, a receiver comprising: means for receiving a signal that was predeterminally transmitted by another relative to the time base wherein signal reception is confirmed when the amplitude of the received signal exceeds a pre-established threshold, means, coupled to the receiving means, for determining signal transit time from the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, means, coupled to the determining means, for controlling the sensitivity of the receiver as a function of the transit time comprising: means for increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at the maximum expected transit time and means, coupled to the gain adjusting means, for nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
Claim 18
Dependent Claim
111 words
In a communications system having a time base for system synchronization, a method of controlling receiver sensitivity comprising: receiving a signal that was predeterminally transmitted by a transmitter relative to the time base, determining the difference in time between the instant of signal transmission by the transmitter and the instant of signal reception by the receiver, and controlling the receiver sensitivity as a function of that time difference by: increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at the maximum expected time difference and nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
Claim 19
Dependent Claim
111 words
In a communications system having a time base for system synchronization, a method of controlling receiver sensitivity comprising: receiving a signal that was predeterminally transmitted by a transmitter relative to the time base, determining the difference in time between the instant of signal transmission by the transmitter and the instant of signal reception by the receiver, and controlling the receiver sensitivity as a function of that time difference by: increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at the maximum expected time difference and nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
Claim 20
Dependent Claim
95 words
In a communications system having a time base for system synchronization, a receiver comprising: means for receiving a signal that was predeterminally transmitted by another relative to the time base, means, coupled to the receiving means, for determining the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, and means, coupled to the determining means, for controlling the sensitivity of the receiver as a function of that time difference by increasing the gain of the receiver with increasing time difference.
Claim 21
Dependent Claim
95 words
In a communications system having a time base for system synchronization, a receiver comprising: means for receiving a signal that was predeterminally transmitted by another relative to the time base, means, coupled to the receiving means, for determining the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, and means, coupled to the determining means, for controlling the sensitivity of the receiver as a function of that time difference by increasing the gain of the receiver with increasing time difference.
Claim 22
Dependent Claim
137 words
In a communications system having a time base for system synchronization, a receiver comprising: means for receiving a signal that was predeterminally transmitted by another relative to the time base, means, coupled to the receiving means, for determining the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, and means, coupled to the determining means, for controlling the sensitivity of the receiver as a function of that time difference by: means for increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at the maximum expected time difference and means, coupled to the gain adjusting means, for nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
Claim 23
Dependent Claim
137 words
In a communications system having a time base for system synchronization, a receiver comprising: means for receiving a signal that was predeterminally transmitted by another relative to the time base, means, coupled to the receiving means, for determining the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, and means, coupled to the determining means, for controlling the sensitivity of the receiver as a function of that time difference by: means for increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at the maximum expected time difference and means, coupled to the gain adjusting means, for nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |