Patents by Inventor Jingmin Xin
Jingmin Xin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7679560Abstract: In an environment of spatially correlated additive noise, the direction estimation apparatus for coherent signals calculates (M?q?1) instantaneous cross-correlations between some array data, and selecting multiple pairs each of which is consisted of p instantaneous correlations from the (M?q?1) instantaneous cross-correlations to form a Hankel correlation matrix, where a length of a spatial correlation in terms of antenna elements is assumed to be q. Next, the apparatus divides that Hankel matrix into an upper submatrix and a lower submatrix, and then calculates a linear operator at time n by using the adaptive LMS algorithm with a fixed or time-varying step-size parameter. Then a noise subspace is estimated from that linear operator. Finally the directions of incident signals at a predetermined time is estimated and tracked by using that noise subspace with Newton approximation.Type: GrantFiled: May 13, 2008Date of Patent: March 16, 2010Assignee: Fujitsu LimitedInventor: Jingmin Xin
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Publication number: 20090079635Abstract: In an environment of temporally and spatially uncorrelated white additive noise, the direction estimation apparatus for coherent signals calculates (M?1) instantaneous cross-correlations between some array data, and selecting multiple pairs each of which is consisted of p instantaneous correlations from the (M?1) instantaneous cross-correlations to form a Hankel correlation matrix. Next, the apparatus divides that Hankel matrix into an upper submatrix and a lower submatrix and then calculates a linear operator at time n by using the adaptive LMS algorithm with a fixed or time-varying step-size parameter and or using the adaptive NLMS algorithm from the two submatrices. Then a noise subspace is estimated from that linear operator. Finally the directions of incident signals at time n is estimated and tracked by using that noise subspace with Newton approximation.Type: ApplicationFiled: May 13, 2008Publication date: March 26, 2009Applicant: FUJITSU LIMITEDInventor: Jingmin Xin
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Patent number: 7450067Abstract: An incoming wave number estimation device for receiving incoming radio waves by an array antenna in which a plurality (=M) of antenna elements are linearly arrayed with a same element spacing, and estimating the number of the incoming radio waves, including: a correlation matrix creation section for removing a diagonal element from a predetermined row or column constituting an M×M array covariance matrix, and creating a correlation matrix by extracting a predetermined p number of correlations from (M?1) number of correlations after the diagonal element is removed while sequentially shifting one element at a time, and arraying the p number correlations in a matrix; an estimation matrix creation section for creating an estimation matrix for estimating the incoming wave number using the correlation matrix; a QR decomposition section for performing QR decomposition on the estimation matrix; and an incoming wave number determination section for determining the number of incoming radio waves based on each row elemeType: GrantFiled: January 8, 2008Date of Patent: November 11, 2008Assignee: Fujitsu LimitedInventor: Jingmin Xin
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Patent number: 7391370Abstract: In an environment of temporally and spatially uncorrelated white additive noise, the direction estimation apparatus for coherent signals calculates (M?1) instantaneous cross-correlations between some array data, and selecting multiple pairs each of which is consisted of p instantaneous correlations from the (M?1) instantaneous cross-correlations to form a Hankel correlation matrix. Next, the apparatus divides that Hankel matrix into an upper submatrix and a lower submatrix and then calculates a linear operator at time n by using the adaptive LMS algorithm with a fixed or time-varying step-size parameter and or using the adaptive NLMS algorithm from the two submatrices. Then a noise subspace is estimated from that linear operator. Finally the directions of incident signals at time n is estimated and tracked by using that noise subspace with Newton approximation.Type: GrantFiled: February 9, 2007Date of Patent: June 24, 2008Assignee: Fujitsu LimitedInventor: Jingmin Xin
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Publication number: 20080129596Abstract: An incoming wave number estimation device for receiving incoming radio waves by an array antenna in which a plurality (=M) of antenna elements are linearly arrayed with a same element spacing, and estimating the number of the incoming radio waves, including: a correlation matrix creation section for removing a diagonal element from a predetermined row or column constituting an M×M array covariance matrix, and creating a correlation matrix by extracting a predetermined p number of correlations from (M?1) number of correlations after the diagonal element is removed while sequentially shifting one element at a time, and arraying the p number correlations in a matrix; an estimation matrix creation section for creating an estimation matrix for estimating the incoming wave number using the correlation matrix; a QR decomposition section for performing QR decomposition on the estimation matrix; and an incoming wave number determination section for determining the number of incoming radio waves based on each row elemeType: ApplicationFiled: January 8, 2008Publication date: June 5, 2008Applicant: FUJITSU LIMITEDInventor: Jingmin Xin
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Patent number: 7379020Abstract: A radio wave direction-of-arrival estimation apparatus and method that can estimate, at high speed and with good accuracy, the direction of arrival of a plurality of incoming waves having high correlation.Type: GrantFiled: March 10, 2006Date of Patent: May 27, 2008Assignee: Fujitsu LimitedInventors: Masataka Tsuchihashi, Yasushi Seike, Kazuo Shirakawa, Jingmin Xin
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Publication number: 20070139268Abstract: In an environment of temporally and spatially uncorrelated white additive noise, the direction estimation apparatus for coherent signals calculates (M?1) instantaneous cross-correlations between some array data, and selecting multiple pairs each of which is consisted of p instantaneous correlations from the (M?1) instantaneous cross-correlations to form a Hankel correlation matrix. Next, the apparatus divides that Hankel matrix into an upper submatrix and a lower submatrix and then calculates a linear operator at time n by using the adaptive LMS algorithm with a fixed or time-varying step-size parameter and or using the adaptive NLMS algorithm from the two submatrices. Then a noise subspace is estimated from that linear operator. Finally the directions of incident signals at time n is estimated and tracked by using that noise subspace with Newton approximation.Type: ApplicationFiled: February 9, 2007Publication date: June 21, 2007Inventor: Jingmin Xin
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Patent number: 7228244Abstract: A direction tracking method is proposed for quickly tracking directions-of-arrival of radio waves even in an environment where trajectories of the directions-of-arrival intersect. With the tracking method, the state vectors of directions-of-arrival (composed of a direction-of-arrival and the angular velocity and acceleration of the direction-of-arrival) at the current direction updating time are predicted with an observer by using state vectors of directions-of-arrival at the previous direction updating time to calculate provisional estimates of the directions-of-arrival, and furthermore, the state vectors at the current direction updating time are calculated based on the provisional estimates, the predicted state vectors, and predicted values of the directions-of-arrival to calculate estimates of the directions-of-arrival from the state vectors.Type: GrantFiled: August 16, 2005Date of Patent: June 5, 2007Assignee: Fujitsu LimitedInventor: Jingmin Xin
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Publication number: 20060208947Abstract: A radio wave direction-of-arrival estimation apparatus and method that can estimate, at high speed and with good accuracy, the direction of arrival of a plurality of incoming waves having high correlation.Type: ApplicationFiled: March 10, 2006Publication date: September 21, 2006Inventors: Masataka Tsuchihashi, Yasushi Seike, Kazuo Shirakawa, Jingmin Xin
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Publication number: 20060212237Abstract: A direction tracking method is proposed for quickly tracking directions-of-arrival of radio waves even in an environment where trajectories of the directions-of-arrival intersect. With the tracking method, the state vectors of directions-of-arrival (composed of a direction-of-arrival and the angular velocity and acceleration of the direction-of-arrival) at the current direction updating time are predicted with an observer by using state vectors of directions-of-arrival at the previous direction updating time to calculate provisional estimates of the directions-of-arrival, and furthermore, the state vectors at the current direction updating time are calculated based on the provisional estimates, the predicted state vectors, and predicted values of the directions-of-arrival to calculate estimates of the directions-of-arrival from the state vectors.Type: ApplicationFiled: August 16, 2005Publication date: September 21, 2006Inventor: Jingmin Xin
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Patent number: 7084812Abstract: L overlapping forward subarrays with {overscore (q)}(?q) antenna elements are formed with, where q is the number of desired signals, a cyclic correlation matrix is formed from the cyclic correlations between the received signals of L forward subarrays and a received signal of the first predetermined antenna element, the cyclic correlated matrix is divided into two upper and lower submatrices, an orthogonal projection operator in the noise subspace is calculated by performing a linear operation on these two upper and lower cyclic correlation matrices, then by calculating a spatial spectrum or a polynomial by using the estimated orthogonal projection operator, the directions are estimated from of the position of q highest peaks of the spatial spectrum or the phases of q roots of the polynomial closest to the unit circle in z-plane.Type: GrantFiled: August 29, 2005Date of Patent: August 1, 2006Assignee: Fujitsu LimitedInventor: Jingmin Xin
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Patent number: 7068221Abstract: An incoming radio wave is received by array antenna elements which constitute an array antenna, and the correlation between the received data of some array antenna elements is calculated to form a correlation matrix which is not affected by the additive noise at each antenna element. Then a noise subspace is obtained from the correlation matrix by a simple linear operation based on the partition of an array response matrix and is used to estimate the direction of signal (i.e., radio wave) impinging on the array antenna. Because the evaluation of all correlations between the array data received by array antenna elements is not needed, and the eigendecomposition process is avoided, the computational load of the proposed direction estimation technique is reduced, and the noise insensitivity is improved.Type: GrantFiled: June 29, 2005Date of Patent: June 27, 2006Assignee: Fujitsu LimitedInventor: Jingmin Xin
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Publication number: 20060007043Abstract: L overlapping forward subarrays with {overscore (q)} (?q) antenna elements are formed with, where q is the number of desired signals, a cyclic correlation matrix is formed from the cyclic correlations between the received signals of L forward subarrays and a received signal of the first predetermined antenna element, the cyclic correlated matrix is divided into two upper and lower submatrices, an orthogonal projection operator in the noise subspace is calculated by performing a linear operation on these two upper and lower cyclic correlation matrices, then by calculating a spatial spectrum or a polynomial by using the estimated orthogonal projection operator, the directions are estimated from of the position of q highest peaks of the spatial spectrum or the phases of q roots of the polynomial closest to the unit circle in z-plane.Type: ApplicationFiled: August 29, 2005Publication date: January 12, 2006Inventor: Jingmin Xin
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Publication number: 20050285788Abstract: An incoming radio wave is received by array antenna elements which constitute an array antenna, and the correlation between the received data of some array antenna elements is calculated to form a correlation matrix which is not affected by the additive noise at each antenna element. Then a noise subspace is obtained from the correlation matrix by a simple linear operation based on the partition of an array response matrix and is used to estimate the direction of signal (i.e., radio wave) impinging on the array antenna. Because the evaluation of all correlations between the array data received by array antenna elements is not needed, and the eigendecomposition process is avoided, the computational load of the proposed direction estimation technique is reduced, and the noise insensitivity is improved.Type: ApplicationFiled: June 29, 2005Publication date: December 29, 2005Inventor: Jingmin Xin