US5721754A
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Signal quality detector and methods thereof
Assignee: Motorola Solutions Inc
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Filing: 1996-05-21
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Granted: 1998-02-24
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Expires: 2016-05-21
Abstract
Abstract A signal quality detector (206) and analogous method thereof for operation on a signal having at least one predetermined frequency, the detector including a symbol detector (209), coupled to the signal, for providing a maximum discrete time Fourier transform value for a time period, the maximum discrete time Fourier transform value corresponding to one of the at least one predetermined frequency, an energy detector (217) for providing an energy estimate corresponding to a energy value of the signal over the time period, and a combinatorial logic (219) for combining the maximum discrete Fourier transform value and the energy estimate to provide a signal quality estimate or signal power or noise power.
Inventors
- 👤 Weizhong Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:39
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/20
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
102 words
A signal quality detector for operation on a signal having at least one predetermined frequency, the detector comprising in combination: a symbol detector, coupled to the signal, for providing a maximum discrete time Fourier transform value for a time period, said maximum discrete time Fourier transform value corresponding to a predetermined frequency selected from the at least one predetermined frequency; an energy detector for providing an energy estimate corresponding to an energy value of said signal over said time period, and a combinatorial logic for combining said maximum discrete Fourier transform value and said energy estimate to provide a signal quality estimate.
Claim 2
Dependent Claim
102 words
A signal quality detector for operation on a signal having at least one predetermined frequency, the detector comprising in combination: a symbol detector, coupled to the signal, for providing a maximum discrete time Fourier transform value for a time period, said maximum discrete time Fourier transform value corresponding to a predetermined frequency selected from the at least one predetermined frequency; an energy detector for providing an energy estimate corresponding to an energy value of said signal over said time period, and a combinatorial logic for combining said maximum discrete Fourier transform value and said energy estimate to provide a signal quality estimate.
Claim 3
Dependent Claim
27 words
The signal quality detector of claim 1 wherein said combinatorial logic further includes a signal power detector for providing an estimated signal power over said time period.
Claim 4
Dependent Claim
27 words
The signal quality detector of claim 2 wherein said combinatorial logic further includes a noise power detector for providing an estimated noise power over said time period.
Claim 5
Dependent Claim
30 words
The signal quality detector of claim 3 wherein said combinatorial logic further provides an estimated signal to noise ratio corresponding to said estimated signal power and said estimated noise power.
Claim 6
Dependent Claim
29 words
The signal quality detector of claim 1 further arranged and constructed to operate on a sampled data FSK signal wherein said time period corresponds to a symbol time period.
Claim 7
Dependent Claim
29 words
The signal quality detector of claim 5 wherein said combinatorial logic further includes a signal power detector for providing an estimated FSK signal power over said symbol time period.
Claim 8
Dependent Claim
28 words
The signal quality detector of claim 6 wherein said combinatorial logic further includes a noise power detector for providing an estimated noise power over said symbol time period.
Claim 9
Dependent Claim
31 words
The signal quality detector of claim 7 wherein said combinatorial logic further provides an estimated signal to noise ratio corresponding to said estimated FSK signal power and said estimated noise power.
Claim 10
Dependent Claim
42 words
The signal quality detector of claim 5 wherein said energy detector squares each sample of said sampled data FSK signal over said symbol time period to provide squared samples and forms a summation of said squared samples to provide said energy estimate.
Claim 11
Dependent Claim
53 words
The signal quality detector of claim 9 wherein said combinatorial logic further includes a signal power detector for providing an estimated FSK signal power over said symbol time period, said estimated FSK signal power corresponding to a difference between said maximum discrete time Fourier transform value and said summation of said squared samples.
Claim 12
Dependent Claim
62 words
The signal quality detector of claim 9 wherein said combinatorial logic further includes a noise power detector for providing an estimated noise power over said symbol time period, said estimated noise power corresponding to a difference between said summation of said squared samples weighted by a number of samples during said symbol time period and said maximum discrete time Fourier transform value.
Claim 13
Dependent Claim
15 words
The signal quality detector of claim 1 further substantially embodied in a digital signal processor.
Claim 14
Dependent Claim
14 words
The signal quality detector of claim 1 further substantially embodied in an integrated circuit.
Claim 15
Independent Claim
90 words
A method of providing a signal quality estimate for a signal having at least one predetermined frequency, the method including the steps of; providing a maximum discrete time Fourier transform value for a time period, said maximum discrete time Fourier transform value corresponding to a predetermined frequency selected from the at least one predetermined frequency; providing an energy estimate corresponding to an energy value of said signal over said time period, and combining said maximum discrete time Fourier transform value and said energy estimate to provide said signal quality estimate.
Claim 16
Independent Claim
90 words
A method of providing a signal quality estimate for a signal having at least one predetermined frequency, the method including the steps of; providing a maximum discrete time Fourier transform value for a time period, said maximum discrete time Fourier transform value corresponding to a predetermined frequency selected from the at least one predetermined frequency; providing an energy estimate corresponding to an energy value of said signal over said time period, and combining said maximum discrete time Fourier transform value and said energy estimate to provide said signal quality estimate.
Claim 17
Dependent Claim
24 words
The method of claim 14 wherein said step of combining further includes a step of providing an estimated signal power over said time period.
Claim 18
Dependent Claim
24 words
The method of claim 15 wherein said step of combining further includes a step of providing an estimated noise power over said time period.
Claim 19
Dependent Claim
29 words
The method of claim 16 wherein said step of combining further provides an estimated signal to noise ratio corresponding to said estimated signal power and said estimated noise power.
Claim 20
Dependent Claim
25 words
The method of claim 14 further arranged to operate on a sampled data FSK signal wherein said time period corresponds to a symbol time period.
Claim 21
Dependent Claim
26 words
The method of claim 18 wherein said step of combining further includes a step of providing an estimated FSK signal power over said symbol time period.
Claim 22
Dependent Claim
25 words
The method of claim 19 wherein said step of combining further includes a step of providing an estimated noise power over said symbol time period.
Claim 23
Dependent Claim
30 words
The method of claim 20 wherein said step of combining further provides an estimated signal to noise ratio corresponding to said estimated FSK signal power and said estimated noise power.
Claim 24
Dependent Claim
50 words
The method of claim 18 wherein said step of providing said energy estimate further squares each sample of said sampled data FSK signal over said symbol time period to provide squared samples and further includes a step of forming a summation of said squared samples to provide said energy estimate.
Claim 25
Dependent Claim
50 words
The method of claim 22 wherein said step of combining further includes a step of providing an estimated FSK signal power over said symbol time period, said estimated FSK signal power corresponding to a difference between said maximum discrete time Fourier transform value and said summation of said squared samples.
Claim 26
Dependent Claim
59 words
The method of claim 22 wherein said step of combining further includes a step of providing an estimated noise power over said symbol time period, said estimated noise power corresponding to a difference between said summation of said squared samples weighted by a number of samples during said symbol time period and said maximum discrete time Fourier transform value.
References Cited (Backward Citations)
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