Impairment correlation estimation in a spread spectrum system
Impairment correlation estimation in a spread spectrum system
 CN 1,957,540 A
 Filed: 03/17/2005
 Published: 05/02/2007
 Est. Priority Date: 03/29/2004
 Status: Active Application
First Claim
1. method of estimating the infringement correlation matrix in the spread spectrum radio receiver comprises:
 Based on the despread symbols that the mulitpath by multipath channel receives, estimate the first infringement correlation matrix;
Based on described despread symbols, estimate the second infringement correlation matrix;
AndBased on the described first and second infringement correlation matrixes, derive final infringement correlation matrix.
Chinese PRB Reexamination
Abstract
A method and apparatus derives an impairment correlation matrix to process signals received at a wireless receiver over multiple paths of a multipath channel. The receiver includes first and second impairment correlation estimators (130, 140) for estimating first and second impairment correlation matrices based on despread symbols received over multiple paths of a multipath channel. The receiver then derives the impairment correlation matrix based on the estimated first and second impairment correlation matrices. The receiver may combine traffic despread values to suppress interference using weighting factors calculated based on the derived impairment correlation matrix. Further, the receiver may estimate a signaltointerference ratio based on the derived impairment correlation matrix.

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No References
60 Claims

1. method of estimating the infringement correlation matrix in the spread spectrum radio receiver comprises:

Based on the despread symbols that the mulitpath by multipath channel receives, estimate the first infringement correlation matrix; Based on described despread symbols, estimate the second infringement correlation matrix;
AndBased on the described first and second infringement correlation matrixes, derive final infringement correlation matrix.


2. the method for claim 1 wherein derives described final infringement correlation matrix based on the described first and second infringement correlation matrixes and comprises that damaging one of correlation matrixes with described first and second is chosen as described final infringement correlation matrix.

3. method as claimed in claim 2 wherein is chosen as described first and second infringement one of correlation matrixes that color that described final infringement correlation matrix is included in the described first infringement correlation matrix satisfies or will described first when surpassing the predetermined color standard damages correlation matrix and is chosen as described final infringement correlation matrix.

4. the method for claim 1 wherein derives described final infringement correlation matrix from the described first and second infringement correlation matrixes and comprises the described first and second infringement correlation matrixes of combination.

5. method as claimed in claim 4, wherein make up the described first and second infringement correlation matrixes and comprise:

Deduct the filtered version of the described first infringement correlation matrix to generate the residual correlation matrix from the described second infringement correlation matrix;
AndDescribed residual correlation matrix is added the above first infringement correlation matrix to derive described final infringement correlation matrix.


6. the method for claim 1, wherein derive described final infringement correlation matrix from the described first and second infringement correlation matrixes and comprise:

Deduct the filtered version of the described first infringement correlation matrix to generate the residual correlation matrix from the described second infringement correlation matrix; Described residual correlation matrix is carried out filtering; Based on the residual correlation matrix of filtering, described first infringement of augmentation is relevant to generate the augmentation correlation matrix;
AndBased on described augmentation correlation matrix, derive described final infringement correlation matrix.


7. the method for claim 1 wherein estimates that based on described despread symbols the described second infringement correlation matrix comprises based on the described second infringement correlation matrix of the described first infringement correlation matrix estimation.

8. method as claimed in claim 7, wherein derive described final infringement correlation matrix based on the described first and second infringement correlation matrixes and comprise:

Calculate the albefaction matrix based on the described first infringement correlation matrix; Described albefaction inverse of a matrix is applied to the described second infringement correlation matrix to generate final residual correlation matrix;
AndMake up described first infringement correlation matrix and described final residual correlation matrix to derive described final infringement correlation matrix.


9. method as claimed in claim 7, wherein derive described final infringement correlation matrix based on the described first and second infringement correlation matrixes and comprise:

Calculate the albefaction matrix inversion based on the described first infringement correlation matrix; Described albefaction matrix inversion is applied to the described second infringement correlation matrix to generate final residual correlation matrix; Based on described final residual correlation matrix, the described first infringement correlation matrix of augmentation is to generate the augmentation correlation matrix;
AndBased on described augmentation correlation matrix, derive described final infringement correlation matrix.


10. method as claimed in claim 7 wherein comprises based on the described second infringement correlation matrix of the described first infringement correlation matrix estimation:

Generate the albefaction matrix based on the described first infringement correlation matrix; Based on described albefaction matrix computations albefaction error vector;
AndEstimate the described second infringement correlation matrix based on described albefaction error vector.


11. method as claimed in claim 10 also comprises based on described despread values generating the despreading error vector, wherein comprises based on described albefaction matrix computations albefaction error vector described despreading error vector be multiply by described albefaction matrix.

12. the method for claim 1, also comprise based on described despread values generating the despreading error vector, wherein estimate based on described despread symbols that the described first and second infringement correlation matrixes comprise based on described despreading error vector and estimate the described first and second infringement correlation matrixes.

13. the method for claim 1 is wherein estimated based on described despread symbols that the described first infringement correlation matrix comprises based on described despread symbols and is determined channel estimating and come estimated parameter infringement correlation matrix based on described channel estimating.

14. the method for claim 1 wherein estimates that based on described despread symbols the described second infringement correlation matrix comprises based on described despread symbols estimation nonparametric infringement correlation matrix.

15. the method for claim 1 also comprises based on described final infringement correlation matrix generating weighted factor, and uses described weighted factor composite service despread symbols to suppress interference.

16. the method for claim 1 also comprises based on described final infringement correlation matrix estimation signaltojamming ratio.

17. the method for claim 1, estimate that wherein a plurality of time slots that the described first and second infringement correlation matrixes are included as received signal estimate described first and second correlation matrixes, and wherein derive based on the described first and second infringement correlation matrixes that color that described final infringement correlation matrix is included in the described first infringement correlation matrix satisfies or will described first when surpassing the predetermined color standard damage correlation matrix and be chosen as the final infringement correlation matrix that is used for described time slot.

18. the method for claim 1, wherein said spread spectrum radio receiver comprises RAKE receiver.

19. the method for claim 1, wherein said wireless frequency expansion receiver be placed on travelling carriage and base station one of at least in.

20. the method for claim 1 is estimated wherein that the described first and second infringement correlation matrixes comprise based on described despread symbols and is determined channel estimating and estimate described first infringement correlation matrix and the described second infringement correlation matrix one of at least based on described channel estimating.

21. the relevant estimator of the infringement in the spread spectrum radio receiver comprises:

Be used for estimating the first relevant estimator of the first infringement correlation matrix based on the despread symbols that the mulitpath by multipath channel receives; Be used for estimating the second relevant estimator of the second infringement correlation matrix based on described despread symbols;
AndBe used for deriving the associative processor of final infringement correlation matrix based on the described first and second infringement correlation matrixes.


22.
The estimator 22. infringement as claimed in claim 21 is correlated with, wherein said associative processor comprise the selector that is used for described first and second infringement one of correlation matrixes are chosen as described final infringement correlation matrix.

23.
The estimator 23. infringement as claimed in claim 21 is correlated with, wherein said associative processor comprise and are used to make up the described first and second infringement correlation matrixes to derive the combiner of described final infringement correlation matrix.

24.
The estimator 24. infringement as claimed in claim 23 is correlated with, wherein said combiner comprises: 
Be used to make the level and smooth smoothing filter of the described first infringement correlation matrix; Be used for deducting the first level and smooth infringement correlation matrix to generate the subtracter of residual correlation matrix from the described second infringement correlation matrix;
AndBe used to make up described residual correlation matrix and the described first infringement correlation matrix to derive the adder of described final infringement correlation matrix.


25.
The estimator 25. infringement as claimed in claim 21 is correlated with, wherein said associative processor comprises: 
Be used to make the level and smooth smoothing filter of the described first infringement correlation matrix; Be used for deducting the first level and smooth infringement correlation matrix to generate the subtracter of residual correlation matrix from the described second infringement correlation matrix; Be used for described residual correlation matrix is carried out filtering and damages correlation matrix to generate the feedback control loop of augmentation correlation matrix based on the residual correlation matrix augmentation of filtering described first;
AndBe used for deriving the parts of final infringement correlation matrix based on described augmentation correlation matrix.


26.
The estimator 26. infringement as claimed in claim 21 is correlated with, the wherein said second relevant estimator are also based on the described second infringement correlation matrix of the described first infringement correlation matrix estimation.

27.
The estimator 27. infringement as claimed in claim 26 is correlated with, wherein said associative processor comprises: 
The albefaction inverse of a matrix is applied to the described second infringement correlation matrix to generate the converter of final residual correlation matrix;
AndMake up described first infringement correlation matrix and described final residual correlation matrix to derive the combiner of described final infringement correlation matrix.


28.
The estimator 28. infringement as claimed in claim 26 is correlated with, wherein said associative processor comprises that the albefaction inverse of a matrix is applied to described second damages correlation matrix to generate the converter of final residual correlation matrix, the wherein said first relevant estimator arrives the described first infringement correlation matrix with generation augmentation correlation matrix with described final residual correlation matrix application, and wherein said associative processor is derived described final infringement correlation matrix from described augmentation correlation matrix.

29.
The estimator 29. infringement as claimed in claim 26 is correlated with, the wherein said second relevant estimator comprises: 
Be used for generating the albefaction matrix unit of albefaction matrix based on the described first infringement correlation matrix; Be used for generating the multiplier of albefaction error vector based on described albefaction matrix, described despread symbols and described channel estimating;
AndBe used for estimating the assessment of damage device of the described second infringement correlation matrix based on described albefaction error vector.


30.
The estimator 30. infringement as claimed in claim 29 is correlated with, also comprise the signal remover that is used for determining based on described despread symbols and channel estimating the despreading error vector, wherein said multiplier multiply by described albefaction matrix to generate described albefaction error vector with described despreading error vector.

31.
The estimator 31. infringement as claimed in claim 21 is correlated with, also comprise the signal remover that is used for based on described despread symbols and described channel estimating generation despreading error vector, wherein said first and second estimators are estimated the described first and second infringement correlation matrixes based on described despreading error vector.

32.
The estimator 32. infringement as claimed in claim 21 is correlated with, the wherein said first relevant estimator is a parameter estimator, and the wherein said first infringement correlation matrix is a parameter infringement correlation matrix.

33.
The estimator 33. infringement as claimed in claim 32 is correlated with, wherein said parameter estimator comprises: 
Be used for measuring the relevant correlation computer of infringement based on described despread values; Be used for determining the structural element computer of infringement structure of models element based on channel estimating; Be used for the relevant parameter estimator of determining the model fitting parameter of infringement based on described structural element and measurement;
AndBe used for calculating the infringement correlation calculator of the described first infringement correlation matrix based on described model fitting parameter and described structural element.


34.
The estimator 34. infringement as claimed in claim 33 is correlated with, wherein said infringement correlation calculator calculates described parameter infringement correlation matrix R according to following formula _{A}: 
R _{A}＝
α
R _{1}+β
R _{2}，
Wherein, α and
β
are the model fitting parameters, and R _{1}And R _{2}Be corresponding to one or more infringement structure of models elements.


35.
The estimator 35. infringement as claimed in claim 21 is correlated with, the wherein said second relevant estimator is nonparameter estimator, and the wherein said second infringement correlation matrix is a nonparametric infringement correlation matrix.

36.
The estimator 36. infringement as claimed in claim 35 is correlated with, wherein said nonparametric estmation device comprises: 
Be used for measuring the relevant correlation computer of infringement based on described despread values;
AndBe used for described infringement measurement of correlation being carried out filter filtering at a plurality of time slots of received signal.


37.
The estimator 37. infringement as claimed in claim 36 is correlated with, also comprise the signal remover that is used for determining based on described despread symbols and channel estimating the despreading error vector, the conjugation that wherein said correlation computer multiply by the despreading error amount in the described despreading error vector other despreading error amount in the described despreading error vector is relevant to generate the infringement of measuring.

38.
The estimator 38. infringement as claimed in claim 21 is correlated with also comprises the control unit of the color that is used to assess the described first infringement correlation matrix.

39.
The estimator 39. infringement as claimed in claim 38 is correlated with, wherein when described first color of damaging correlation matrix satisfied or surpasses the predetermined color standard, described control unit was forbidden the described second relevant estimator at least.

40.
The estimator 40. infringement as claimed in claim 21 is correlated with, wherein said wireless receiver be placed on travelling carriage and base station one of at least in.

41. a method that suppresses to disturb in the wireless frequency expansion receiver comprises:

The symbol despreading that will receive by the mulitpath of multipath channel; The sign estimation first and second infringement correlation matrixes based on institute'"'"'s despreading; Based on the described first and second infringement correlation matrixes, derive final infringement correlation matrix;
AndThe weighted factor that use is determined according to described final infringement correlation matrix, the symbol of combination institute despreading is to suppress described interference.


42. method as claimed in claim 41 wherein derives described final infringement correlation matrix based on the described first and second infringement correlation matrixes and comprises that damaging one of correlation matrixes with described first and second is chosen as described final infringement correlation matrix.

43. method as claimed in claim 41 wherein derives described final infringement correlation matrix based on the described first and second infringement correlation matrixes and comprises the described first and second infringement correlation matrixes of combination.

44. method as claimed in claim 41 wherein comprises based on the described second infringement correlation matrix of the described first infringement correlation matrix estimation based on the described second infringement correlation matrix of the sign estimation of institute'"'"'s despreading.

45. method as claimed in claim 44 wherein comprises based on the described second infringement correlation matrix of the described first infringement correlation matrix estimation:

Generate the albefaction matrix based on the described first infringement correlation matrix; Generate the albefaction error vector based on described albefaction matrix;
AndEstimate the described second infringement correlation matrix based on described albefaction error vector.


46. method as claimed in claim 41 wherein comprises based on the symbol of institute'"'"'s despreading based on the described first infringement correlation matrix of the sign estimation of institute'"'"'s despreading and determines channel estimating and come estimated parameter infringement correlation matrix based on described channel estimating.

47. method as claimed in claim 41 wherein comprises based on the sign estimation nonparametric of institute'"'"'s despreading based on the described second infringement correlation matrix of the sign estimation of institute'"'"'s despreading and damages correlation matrix.

48. method as claimed in claim 41, wherein said wireless frequency expansion receiver be placed on travelling carriage and base station one of at least in.

49. the method for an estimated signal interference ratio in the wireless frequency expansion receiver comprises:

The symbol despreading that will receive by the mulitpath of multipath channel; The sign estimation first and second infringement correlation matrixes based on institute'"'"'s despreading; Based on the described first and second infringement correlation matrixes, derive final infringement correlation matrix;
AndBased on the described final described signaltojamming ratio of infringement correlation matrix estimation.


50. method as claimed in claim 49 wherein derives described final infringement correlation matrix based on the described first and second infringement correlation matrixes and comprises that damaging one of correlation matrixes with described first and second is chosen as described final infringement correlation matrix.

51. method as claimed in claim 49 wherein derives described final infringement correlation matrix based on the described first and second infringement correlation matrixes and comprises the described first and second infringement correlation matrixes of combination.

52. method as claimed in claim 49 wherein comprises based on the described second infringement correlation matrix of the described first infringement correlation matrix estimation based on the described second infringement correlation matrix of the sign estimation of institute'"'"'s despreading.

53. method as claimed in claim 52 wherein comprises based on the described second infringement correlation matrix of the described first infringement correlation matrix estimation:

Generate the albefaction matrix based on the described first infringement correlation matrix; Generate the albefaction error vector based on described albefaction matrix;
AndEstimate the described second infringement correlation matrix based on described albefaction error vector.


54. method as claimed in claim 49 wherein comprises based on the symbol of institute'"'"'s despreading based on the described first infringement correlation matrix of the sign estimation of institute'"'"'s despreading and determines channel estimating and come estimated parameter infringement correlation matrix based on described channel estimating.

55. method as claimed in claim 49 wherein comprises based on the sign estimation nonparametric of institute'"'"'s despreading based on the described second infringement correlation matrix of the sign estimation of institute'"'"'s despreading and damages correlation matrix.

56. method as claimed in claim 49, wherein said wireless frequency expansion receiver be placed on travelling carriage and base station one of at least in.

57. one kind is stored in and is used for store sets of instructions in the radio communication device to estimate the computerreadable medium of infringement correlation matrix, described instruction set comprises
Estimate that based on the despread symbols that the mulitpath by multipath channel receives first damages the instruction of correlation matrix; 
Estimate the instruction of the second infringement correlation matrix based on described despread symbols;
AndDerive the instruction of final infringement correlation matrix based on the described first and second infringement correlation matrixes.


58. computerreadable medium as claimed in claim 57, wherein said instruction of deriving described final infringement correlation matrix based on the described first and second infringement correlation matrixes comprise the instruction that one of described first and second infringement correlation matrixes is chosen as described final infringement correlation matrix.

59. computerreadable medium as claimed in claim 57, wherein said instruction of deriving described final infringement correlation matrix from the described first and second infringement correlation matrixes comprises the instruction of the described first and second infringement correlation matrixes of combination.

60. computerreadable medium as claimed in claim 57, wherein said radio communication device be placed on travelling carriage and base station one of at least in.
Specification(s)