US6044083A
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Synchronous code division multiple access communication system
Assignee: LG Electronics Inc
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Filing: 1996-06-04
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Granted: 2000-03-28
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Expires: 2016-06-04
Abstract
Abstract In a synchronous code division multiple access (SCDMA) system, a set of substantially orthogonal code words is selected such that each code word in the set of substantially orthogonal code words is minimally correlated with a channel characteristic such as noise. When a station transmits a data signal, it multiplies the data signal by its assigned code word in order to produce a spread data signal. The spread data signal is transmitted over the channel of the SCDMA system.
Inventors
- 👤 Richard W. Citta
- 👤 Stephen M. Dicke
- 👤 David A. Willming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:50
CPC Classifications
H; H04; H04J; H04J13/00; H04J13/0007; H04J13/004; H04J13/16; H04J13/18; H04N; H04N21/00; H04N21/60; H04N21/61; H04N21/6106; H04N21/6118; H04N21/6156; H04N21/6168; H04N7/00; H04N7/16; H04N7/173; H04N7/17309; H04L; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5672; H04L2012/5676
Claims Analysis
Total Claims: 64
Claim 1
Independent Claim
68 words
A method of transmitting a data signal over a communication channel comprising the steps of: selecting a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with a characteristic of the communication channel; and, using a code word of the set of code words in order to transmit the data signal over the communication channel.
Claim 2
Independent Claim
68 words
A method of transmitting a data signal over a communication channel comprising the steps of: selecting a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with a characteristic of the communication channel; and, using a code word of the set of code words in order to transmit the data signal over the communication channel.
Claim 3
Dependent Claim
64 words
The method of claim 1 wherein one of the characteristics is noise on the communication channel, and wherein the step of selecting a set of substantially orthogonal code words comprises the step of selecting a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with the noise on the communication channel.
Claim 4
Dependent Claim
28 words
The method of claim 1 wherein the step of selecting a set of substantially orthogonal code words comprises the step of sampling the characteristic of the communication channel.
Claim 5
Dependent Claim
30 words
The method of claim 3 wherein the step of selecting a set of substantially orthogonal code words comprises the step of determining a correlation matrix based upon the characteristic samples.
Claim 6
Dependent Claim
26 words
The method of claim 4 wherein the step of selecting a set of substantially orthogonal code words comprises the step of determining an orthonormal random matrix.
Claim 7
Dependent Claim
39 words
The method of claim 5 wherein the step of selecting a set of substantially orthogonal code words comprises the step of determining the set of substantially orthogonal code words based upon the correlation matrix and the orthonormal random matrix.
Claim 8
Dependent Claim
30 words
The method of claim 6 wherein the step of determining a correlation matrix based upon the characteristic samples comprises the step of determining eigenvalues and eigenvectors of the correlation matrix.
Claim 9
Dependent Claim
48 words
The method of claim 7 wherein the step of determining the eigenvalues and eigenvectors of the correlation matrix comprises the steps of summing the eigenvalues until an average of the summed eigenvalues is greater than a predetermined threshold and of selecting the summed eigenvalues and their corresponding eigenvectors.
Claim 10
Dependent Claim
49 words
The method of claim 8 wherein the step of determining the set of substantially orthogonal code words based upon the correlation matrix and the orthonormal random matrix comprises the step of determining a set of substantially orthogonal code vectors based upon the orthonormal random matrix and the selected eigenvectors.
Claim 11
Dependent Claim
33 words
The method of claim 9 wherein the step of determining the set of substantially orthogonal code vectors comprises the step of sorting the substantially orthogonal code vectors based upon relative expected characteristic power.
Claim 12
Dependent Claim
45 words
The method of claim 10 wherein the step of determining the set of substantially orthogonal code vectors comprises the step of rotating the sorted substantially orthogonal code vectors in pairs until the relative expected characteristic power converges to substantially a total average expected characteristic power.
Claim 13
Independent Claim
79 words
A method of transmitting a data signal over a communication channel comprising the steps of: selecting a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with noise on the communication channel; multiplying the data signal by a code word of the set of substantially orthogonal code words in order to produce a spread data signal; and, transmitting the spread data signal over the communication channel.
Claim 14
Independent Claim
79 words
A method of transmitting a data signal over a communication channel comprising the steps of: selecting a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with noise on the communication channel; multiplying the data signal by a code word of the set of substantially orthogonal code words in order to produce a spread data signal; and, transmitting the spread data signal over the communication channel.
Claim 15
Dependent Claim
28 words
The method of claim 12 wherein the step of selecting a set of substantially orthogonal code words comprises the step of sampling the noise on the communication channel.
Claim 16
Dependent Claim
38 words
The method of claim 13 wherein the step of sampling the noise on the communication channel comprises the step of periodically sampling the noise characteristics in order to recompute the substantially orthogonal code words as the noise changes.
Claim 17
Dependent Claim
31 words
The method of claim 13 wherein the step of selecting a set of substantially orthogonal code words comprises the step of determining a noise correlation matrix based upon the noise samples.
Claim 18
Dependent Claim
26 words
The method of claim 15 wherein the step of selecting a set of substantially orthogonal code words comprises the step of determining an orthonormal random matrix.
Claim 19
Dependent Claim
40 words
The method of claim 16 wherein the step of selecting a set of substantially orthogonal code words comprises the step of determining the set of substantially orthogonal code words based upon the noise correlation matrix and the orthonormal random matrix.
Claim 20
Dependent Claim
32 words
The method of claim 17 wherein the step of determining a noise correlation matrix based upon the noise samples comprises the step of determining eigenvalues and eigenvectors of the noise correlation matrix.
Claim 21
Dependent Claim
49 words
The method of claim 18 wherein the step of determining the eigenvalues and eigenvectors of the noise correlation matrix comprises the steps of summing the eigenvalues until an average of the summed eigenvalues is greater than a predetermined threshold and of selecting the summed eigenvalues and their corresponding eigenvectors.
Claim 22
Dependent Claim
50 words
The method of claim 19 wherein the step of determining the set of substantially orthogonal code words based upon the noise correlation matrix and the orthonormal random matrix comprises the step of determining a set of substantially orthogonal code vectors based upon the orthonormal random matrix and the selected eigenvectors.
Claim 23
Dependent Claim
33 words
The method of claim 20 wherein the step of determining the set of substantially orthogonal code vectors comprises the step of sorting the substantially orthogonal code vectors based upon relative expected noise power.
Claim 24
Dependent Claim
45 words
The method of claim 21 wherein the step of determining the set of substantially orthogonal code vectors comprises the step of rotating the sorted substantially orthogonal code vectors in pairs until the relative expected noise power converges to substantially a total average expected noise power.
Claim 25
Independent Claim
74 words
An apparatus for transmitting a data signal over a communication channel comprising: means for determining a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with noise on the communication channel; means for modulating the data signal with a code word of the set of substantially orthogonal code words; and, means for transmitting the modulated data signal over the communication channel.
Claim 26
Independent Claim
74 words
An apparatus for transmitting a data signal over a communication channel comprising: means for determining a set of substantially orthogonal code words such that each code word in the set of substantially orthogonal code words is minimally correlated with noise on the communication channel; means for modulating the data signal with a code word of the set of substantially orthogonal code words; and, means for transmitting the modulated data signal over the communication channel.
Claim 27
Dependent Claim
27 words
The apparatus of claim 23 wherein the means for determining a set of substantially orthogonal code words comprises means for sampling the noise on the communication channel.
Claim 28
Dependent Claim
30 words
The apparatus of claim 24 wherein the means for determining a set of substantially orthogonal code words comprises means for determining a noise correlation matrix based upon the noise samples.
Claim 29
Dependent Claim
25 words
The apparatus of claim 25 wherein the means for determining a set of substantially orthogonal code words comprises means for determining an orthonormal random matrix.
Claim 30
Dependent Claim
39 words
The apparatus of claim 26 wherein the means for determining a set of substantially orthogonal code words comprises means for determining the set of substantially orthogonal code words based upon the noise correlation matrix and the orthonormal random matrix.
Claim 31
Dependent Claim
31 words
The apparatus of claim 27 wherein the means for determining a noise correlation matrix based upon the noise samples comprises means for determining eigenvalues and eigenvectors of the noise correlation matrix.
Claim 32
Dependent Claim
48 words
The apparatus of claim 28 wherein the means for determining the eigenvalues and eigenvectors of the noise correlation matrix comprises means for summing the eigenvalues until an average of the summed eigenvalues is greater than a predetermined threshold and for selecting the summed eigenvalues and their corresponding eigenvectors.
Claim 33
Dependent Claim
49 words
The apparatus of claim 29 wherein the means for determining the set of substantially orthogonal code words based upon the noise correlation matrix and the orthonormal random matrix comprises means for determining a set of substantially orthogonal code vectors based upon the orthonormal random matrix and the selected eigenvectors.
Claim 34
Dependent Claim
32 words
The apparatus of claim 30 wherein the means for determining the set of substantially orthogonal code vectors comprises means for sorting the substantially orthogonal code vectors based upon relative expected noise power.
Claim 35
Dependent Claim
44 words
The apparatus of claim 31 wherein the means for determining the set of substantially orthogonal code vectors comprises means for rotating the sorted substantially orthogonal code vectors in pairs until the relative expected noise power converges to substantially a total average expected noise power.
Claim 36
Dependent Claim
88 words
A receiver for receiving a data vector over a communication channel, wherein the data vector is a combination of a code vector and data, wherein the code vector is minimally correlated with a characteristic of the communication channel, the receiver comprising: means for receiving the data vector; and, means for applying a code word to the data vector, wherein the code word is related to the code vector so that, when the code word is applied to the data vector, the data is recovered from the data vector.
Claim 37
Dependent Claim
88 words
A receiver for receiving a data vector over a communication channel, wherein the data vector is a combination of a code vector and data, wherein the code vector is minimally correlated with a characteristic of the communication channel, the receiver comprising: means for receiving the data vector; and, means for applying a code word to the data vector, wherein the code word is related to the code vector so that, when the code word is applied to the data vector, the data is recovered from the data vector.
Claim 38
Dependent Claim
29 words
The receiver of claim 33 wherein the characteristic is noise on the communication channel, and wherein the code vector is minimally correlated with the noise on the communication channel.
Claim 39
Dependent Claim
52 words
The receiver of claim 33 wherein the characteristic is noise on the communication channel, and wherein the code vector is one of a set of substantially orthogonal code vectors such that each code vector in the set of substantially orthogonal code vectors is minimally correlated with the noise on the communication channel.
Claim 40
Dependent Claim
27 words
The receiver of claim 35 wherein the set of substantially orthogonal code vectors is determined from a correlation matrix based upon the noise on the communication channel.
Claim 41
Dependent Claim
20 words
The receiver of claim 36 wherein the set of substantially orthogonal code vectors is determined from an orthonormal random matrix.
Claim 42
Dependent Claim
23 words
The receiver of claim 37 wherein the set of substantially orthogonal code vectors is determined from eigenvalues and eigenvectors of the correlation matrix.
Claim 43
Dependent Claim
40 words
The receiver of claim 38 wherein the eigenvectors are determined by summing eigenvalues of the correlation matrix until an average of the summed eigenvalues is greater than a predetermined threshold, and by selecting those eigenvectors corresponding to the summed eigenvalues.
Claim 44
Dependent Claim
24 words
The receiver of claim 39 wherein the set of substantially orthogonal code vectors is determined from the orthonormal random matrix and the selected eigenvectors.
Claim 45
Dependent Claim
27 words
The receiver of claim 40 wherein the substantially orthogonal code vectors of the set of substantially orthogonal code vectors are sorted based upon relative expected characteristic power.
Claim 46
Dependent Claim
39 words
The receiver of claim 41 wherein the substantially orthogonal code vectors in the set of sorted substantially orthogonal code vectors are rotated in pairs until the relative expected characteristic power converges to substantially a total average expected characteristic power.
Claim 47
Independent Claim
62 words
An apparatus for transmitting a data signal over a communication channel comprising: means for modulating the data signal with a code word, wherein the code word is selected from a set of substantially orthogonal code words, and wherein the code word is minimally correlated with noise on the communication channel; and, means for transmitting the modulated data signal over the communication channel.
Claim 48
Independent Claim
62 words
An apparatus for transmitting a data signal over a communication channel comprising: means for modulating the data signal with a code word, wherein the code word is selected from a set of substantially orthogonal code words, and wherein the code word is minimally correlated with noise on the communication channel; and, means for transmitting the modulated data signal over the communication channel.
Claim 49
Dependent Claim
24 words
The apparatus of claim 43 wherein the code word is determined from a noise correlation matrix based upon the noise on the communication channel.
Claim 50
Dependent Claim
16 words
The apparatus of claim 44 wherein the code word is determined from an orthonormal random matrix.
Claim 51
Dependent Claim
24 words
The apparatus of claim 45 wherein the set of substantially orthogonal code words is determined from eigenvalues and eigenvectors of the noise correlation matrix.
Claim 52
Dependent Claim
47 words
The apparatus of claim 46 wherein the eigenvectors of the noise correlation matrix are determined by summing the eigenvalues of the noise correlation matrix until an average of the summed eigenvalues is greater than a predetermined threshold, and by selecting those eigenvalues corresponding to the summed eigenvalues.
Claim 53
Dependent Claim
24 words
The apparatus of claim 47 wherein the set of substantially orthogonal code words is determined from the orthonormal random matrix and the selected eigenvectors.
Claim 54
Dependent Claim
27 words
The apparatus of claim 48 wherein the substantially orthogonal code vectors of the set of substantially orthogonal code vectors are sorted based upon relative expected noise power.
Claim 55
Dependent Claim
38 words
The apparatus of claim 49 wherein the substantially orthogonal code vectors of the set of substantially orthogonal code vectors are rotated in pairs until the relative expected noise power converges to substantially a total average expected noise power.
Claim 56
Independent Claim
78 words
A method of decoding a data vector received over a communication channel, wherein the data vector comprises data converted to the data vector by a code vector, wherein the code vector is minimally correlated with noise oil the communication channel, wherein the method comprises the following steps: correlating the data vector to a decode word to produce a correlation result, wherein the decode word is related to the code vector; and, recovering the data from the correlation result.
Claim 57
Independent Claim
78 words
A method of decoding a data vector received over a communication channel, wherein the data vector comprises data converted to the data vector by a code vector, wherein the code vector is minimally correlated with noise oil the communication channel, wherein the method comprises the following steps: correlating the data vector to a decode word to produce a correlation result, wherein the decode word is related to the code vector; and, recovering the data from the correlation result.
Claim 58
Dependent Claim
17 words
The method of claim 51 wherein the decode word is a complex conjugate of the code vector.
Claim 59
Dependent Claim
17 words
The method of claim 52 wherein the recovering step comprises the step of derotating the correlation result.
Claim 60
Dependent Claim
18 words
The method of claim 53 wherein the recovering step comprises the step of decimating the derotated correlation result.
Claim 61
Dependent Claim
20 words
The method of claim 54 wherein the recovering step comprises the step of descrambling the decimated and derotated correlation result.
Claim 62
Dependent Claim
18 words
The method of claim 51 wherein the correlating step comprises the step of quadrature demodulating the data vector.
Claim 63
Dependent Claim
21 words
The method of claim 56 wherein the correlating step comprises the stop of root-raised cosine filtering the quadrature demodulated data vector.
Claim 64
Dependent Claim
27 words
The method of claim 57 wherein the correlating step comprises the step of correlating the root-raised cosine filtered and quadrature demodulated data erector to the decode word.
References Cited (Backward Citations)
US5461610A
Cited
US5619503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-28 | 2003-09-27 | 2004-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-28 | 2007-09-27 | 2008-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-28 | 2011-09-27 | 2012-03-28 | $7700.00 | Window Closed / Lapsed |