US5048015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference source identification
Assignee: Nokia Bell Labs
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Filing: 1990-06-14
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Granted: 1991-09-10
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Expires: 2010-06-14
Abstract
Abstract A method and apparatus for immediately identifying the presence and the source of interference in a communications system. A separate identification code is superimposed on each signal transmitted from a separate transmitter. At any receiver, if an undesired signal causes interference, it can be idenified via its associated identification code. In one embodiment, spread spectrum chip sequences are used as the identification codes.
Inventors
- 👤 Yossi Zilberfarb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:44
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/1027
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
118 words
A receiver for receiving a desired transmitted signal, from among a plurality of transmitted signals, each of the transmitted signals comprising a data signal and a superimposed identification signal, each identification signal having a predetermined amplitude, the receiver comprising: means for comparing the amplitude of the identification signal of the desired transmitted signal to an amplitude of an identification signal of at least one other transmitted signal from the plurality transmitted signals; and means for causing an alarm condition when said means for comparing indicates that said amplitude of said identification signal from said at least one other transmitted signal is greater than a predetermined fraction of said amplitude of said identification signal of said desired transmitted signal.
Claim 2
Dependent Claim
118 words
A receiver for receiving a desired transmitted signal, from among a plurality of transmitted signals, each of the transmitted signals comprising a data signal and a superimposed identification signal, each identification signal having a predetermined amplitude, the receiver comprising: means for comparing the amplitude of the identification signal of the desired transmitted signal to an amplitude of an identification signal of at least one other transmitted signal from the plurality transmitted signals; and means for causing an alarm condition when said means for comparing indicates that said amplitude of said identification signal from said at least one other transmitted signal is greater than a predetermined fraction of said amplitude of said identification signal of said desired transmitted signal.
Claim 3
Dependent Claim
15 words
The receiver of claim 1 wherein the identification signal is a pseudorandom sequence of tones.
Claim 4
Dependent Claim
16 words
The receiver of claim 1 wherein the identification signal is a pseudorandom sequence of digital bits.
Claim 5
Dependent Claim
30 words
The receiver of claims 1, 2 or 3 further including means for repetitively correlating the received signal to a plurality of predetermined identification codes for a predetermined amount of time.
Claim 6
Dependent Claim
33 words
The receiver of claims 1, 2, or 3 further comprising table lookup means connected to said means for comparing for identifying one or more transmitters that are associated with a particular identification code.
Claim 7
Dependent Claim
14 words
The receiver claims 1, 2, or 3 wherein the receiver is a satellite receiver.
Claim 8
Dependent Claim
11 words
The receiver claim 4 wherein the receiver is a satellite receiver.
Claim 9
Dependent Claim
11 words
The receiver claim 5 wherein the receiver is a satellite receiver.
Claim 10
Dependent Claim
123 words
In a receiver for receiving a desired transmitted signal, from among a plurality of transmitted signals, the transmitted signals comprising a data signal and a superimposed identification signal, each identification signal having a predetermined amplitude, a method of identifying interference in a transmitted signal comprising the steps of: comparing the amplitude of the identification signal of the desired transmitted signal to the amplitude of the identification signal of at least one other transmitted signal from the plurality of transmitted signals; outputting an alarm signal when said step of comparing indicates that said amplitude of said identification signal from said at least one other transmitted signal is greater than a predetermined fraction of said amplitude of said identification signal of said desired transmitted signal.
Claim 11
Dependent Claim
123 words
In a receiver for receiving a desired transmitted signal, from among a plurality of transmitted signals, the transmitted signals comprising a data signal and a superimposed identification signal, each identification signal having a predetermined amplitude, a method of identifying interference in a transmitted signal comprising the steps of: comparing the amplitude of the identification signal of the desired transmitted signal to the amplitude of the identification signal of at least one other transmitted signal from the plurality of transmitted signals; outputting an alarm signal when said step of comparing indicates that said amplitude of said identification signal from said at least one other transmitted signal is greater than a predetermined fraction of said amplitude of said identification signal of said desired transmitted signal.
Claim 12
Dependent Claim
15 words
The method of claim 9 wherein the identification signal is a pseudorandom sequence of tones.
Claim 13
Dependent Claim
16 words
The method of claim 9 wherein the identification signal is a pseudorandom sequence of digital bits.
Claim 14
Independent Claim
31 words
The method of claims 9, 10, or 11 further including the step of repetitively correlating the received signal to a plurality of predetermined identification codes for a predetermined amount of time.
Claim 15
Independent Claim
30 words
The method of claims 9, 10, or 11 further comprising the step of identifying, one or more transmitters that are associated with a particular identification code causing an alarm condition.
Claim 16
Independent Claim
15 words
The method of claims 9, 10, or 11 wherein the receiver is a satellite receiver.
Claim 17
Dependent Claim
12 words
The method of claim 12 wherein the receiver is a satellite receiver.
Claim 18
Dependent Claim
12 words
The method of claim 13 wherein the receiver is a satellite receiver.
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) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |