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US4475186A
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Multiplexed noise coded switching system
Assignee: United States Department of the Army
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Filing: 1982-07-28
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Granted: 1984-10-02
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Expires: 2002-07-28
Abstract
Abstract A switching system for performing line to line or group to group switching of communication signals modulated by multiplexed noise codes. The noise codes comprise a subclass or set of multiplexed noise codes consisting of code mate pairs which provide an impulse autocorrelation function when detected and furthermore crosscorrelate to zero at a time when the code mate pairs compress to an impulse providing thereby orthogonal operation, meaning that there is no mutual interference between any of the input/output lines when the signals are translated thereon concurrently. Plural sets of noise code generators and code selectors are coupled to predetermined ones of a plurality of sets of matched filter detectors and code selectors in accordance with a switching algorithm which sets selected code selectors to the same code mate pairs so that a specific signal applied to a predetermined input line and thereafter coupled to modulation means connected to one set of code generators is directed to a predetermined output line that is connected to a matched filter decoder pair matched to the input code.
Inventors
- 👤 Frank S. Gutleber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:51
CPC Classifications
H; H04; H04J; H04J13/00; H04J13/0007; H04J13/004; H04J13/16; H04J13/18
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
216 words
A multiplexed noise coded switching system for making selective interconnection between a plurality of signal input lines and a plurality of signal output lines, comprising in combination: input circuit means respectively coupled to each of said input lines and wherein each of said input circuit means includes means for generating a respective multiplexed noise code formed with code mate pairs having autocorrelation functions which upon detection compress to an impulse and additionally having crosscorrelation functions equal to zero at a time when said code mate pairs compress to an impulse; means for modulating a respective input signal with a selected code mate pair, output circuit means respectively coupled to each of said output lines and wherein each of said output circuit means includes detector means responsive to a selected code mate pair modulating an input signal applied to said input lines for detecting and compressing said code mate pair to an impulse output signal which is applied to the respective output line, means for commonly connecting all of said input circuit means with all of said output circuit means, and whereby any input signal modulated by a generated code mate pair will only translate to a selected output line whose detector means are matched to said code mate pair while non-interfering with all other output lines.
Claim 2
Dependent Claim
216 words
A multiplexed noise coded switching system for making selective interconnection between a plurality of signal input lines and a plurality of signal output lines, comprising in combination: input circuit means respectively coupled to each of said input lines and wherein each of said input circuit means includes means for generating a respective multiplexed noise code formed with code mate pairs having autocorrelation functions which upon detection compress to an impulse and additionally having crosscorrelation functions equal to zero at a time when said code mate pairs compress to an impulse; means for modulating a respective input signal with a selected code mate pair, output circuit means respectively coupled to each of said output lines and wherein each of said output circuit means includes detector means responsive to a selected code mate pair modulating an input signal applied to said input lines for detecting and compressing said code mate pair to an impulse output signal which is applied to the respective output line, means for commonly connecting all of said input circuit means with all of said output circuit means, and whereby any input signal modulated by a generated code mate pair will only translate to a selected output line whose detector means are matched to said code mate pair while non-interfering with all other output lines.
Claim 3
Dependent Claim
24 words
The switching system as defined by claim 1 wherein each of said input circuit means includes means for generating mutually different multiplexed noise codes.
Claim 4
Dependent Claim
57 words
The switching system as defined by claim 2 wherein said noise code generating means comprises first and second noise code generates each generating one code of a code mate pair, and said modulating means comprises first and second signal modulators respectively coupled to said first and second noise code generators and commonly coupled to the respective input.
Claim 5
Dependent Claim
16 words
The switching system as defined by claim 3 wherein said detector means comprises autocorrelation detector means.
Claim 6
Dependent Claim
59 words
The switching system as defined by claim 4 wherein said autocorrelation detector means comprises first and second noise code compressor means each matched to a different one of said first and second code generators, and adder means coupled to said first and second code compressor means for linearly adding the compressed output thereof to provide said impulse output signal.
Claim 7
Dependent Claim
21 words
The switching system as defined by claim 5 wherein said first and second code compressor means are comprised of matched filters.
Claim 8
Dependent Claim
75 words
The switching system as defined by claim 5 and additionally including code selector means coupled to said first and second noise code generators for producing a desired code mate pair, and additionally including code selector means coupled to said first and second noise code compressor means for matching the code of said first code generator to said first code compressor means and the code of said second code generator to said second code compressor means.
Claim 9
Dependent Claim
78 words
The switching system as defined by claim 5 wherein said connecting means comprises a first linear adder coupled to all of said first signal modulators, a second linear adder coupled to all of said second signal modulators, a first noise code bus commonly connected between said first linear adder and all of said first code compressor means, and a second noise code bus commonly connected between said second linear adder and all of said second code compressor means.
Claim 10
Dependent Claim
41 words
The switching system as defined by claim 5 and additionally including timing means coupled between said input circuit means and said output circuit means for starting all of the generated noise codes and for detecting all of said noise codes concurrently.
Claim 11
Dependent Claim
61 words
The switching system as defined by claim 9 wherein said timing means includes a clock signal generator coupled to all said first and second noise code generators and a respective signal output gate coupled to all said adder means coupled to said first and second noise code compressor means and energized in accordance with the operation of said clock signal generator.
Claim 12
Dependent Claim
25 words
The switching system as defined by claim 10 and additionally including gate generator means coupled between said clock signal generator and each signal output gate.
Claim 13
Dependent Claim
20 words
The switching system as defined by claim 1 wherein said code mate pairs are comprised of multi-bit binary digital codes.
Claim 14
Independent Claim
195 words
A method of selectively switching a plurality of electrical signals between a plurality of signal input lines and a plurality of signal output lines while providing orthogonal operation therebetween, comprising the steps of: generating a plurality of different multiplexed noise codes comprising code mate pairs having autocorrelation functions which upon detection compress to an impulse and additionally having crosscorrelation functions equal to zero at a time when said code mates compress to an impulse; modulating each input signal applied to a respective input line with a different code mate pair; translating the modulated signals to a plurality of code detectors; selectively matching said code detectors to predetermined different code mate pairs of said different noise codes; detecting and compressing each different code mate pair to an impulse signal in a code detector matched to a particular code mate pair to provide a respective output signal for each input signal; and applying each output signal to a respective output line, whereby any input signal modulated by a particular generated code mate pair will only translate to a selected output line whose code detector is matched to that code mate pair while non-interfering with all modulated signals.
Claim 15
Independent Claim
195 words
A method of selectively switching a plurality of electrical signals between a plurality of signal input lines and a plurality of signal output lines while providing orthogonal operation therebetween, comprising the steps of: generating a plurality of different multiplexed noise codes comprising code mate pairs having autocorrelation functions which upon detection compress to an impulse and additionally having crosscorrelation functions equal to zero at a time when said code mates compress to an impulse; modulating each input signal applied to a respective input line with a different code mate pair; translating the modulated signals to a plurality of code detectors; selectively matching said code detectors to predetermined different code mate pairs of said different noise codes; detecting and compressing each different code mate pair to an impulse signal in a code detector matched to a particular code mate pair to provide a respective output signal for each input signal; and applying each output signal to a respective output line, whereby any input signal modulated by a particular generated code mate pair will only translate to a selected output line whose code detector is matched to that code mate pair while non-interfering with all modulated signals.
Claim 16
Dependent Claim
50 words
The method as defined by claim 13 wherein said step of translating comprises translating all modulated signals of one code of said different code mate pairs on a common signal channel and translating all modulated signals of the code of said different code mate pairs on another common signal channel.
Claim 17
Dependent Claim
36 words
The method as defined by claim 14 wherein said step of generating said plurality of different code mate pairs comprises generating each code of a code mate pair separately under the control of a code selector.
Claim 18
Dependent Claim
41 words
The method as defined by claim 14 wherein said step of detecting each different code mate pair comprises detecting each code of a code mate pair separately and said step of compressing comprises adding the respective detected code mate pairs together.
Claim 19
Dependent Claim
53 words
The method as defined by claim 16 where said step of detecting each code of a code mate pair separately is under the control of code selector for selectively matching a specific modulating code mate pair coupled to a predetermined input line to a specific code detector coupled to a predetermined output line.
Claim 20
Dependent Claim
45 words
The method as defined by claim 16 wherein said step of separately detecting each code of a code mate pair comprises matched filter detecting and said step of adding the detected code mate pairs together comprises linearly adding the respective detected code mate pairs together.
Claim 21
Dependent Claim
28 words
The method as defined by claim 14 wherein said step of generating said plurality of different multiplexed noise codes comprises generating all said different code mate pairs concurrently.
Claim 22
Dependent Claim
26 words
The method as defined by claim 19 and wherein said step of detecting and compressing comprises detecting and compressing all said different code mate pairs concurrently.
Claim 23
Dependent Claim
19 words
The method as defined by claim 13 wherein said code mate pairs are comprised of multi-bit binary digital codes.
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| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
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