MIMO DECODER AND MIMO DECODING METHOD
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Abstract
A MIMO decoder, which is capable of changing a search area of a transmission signal vector in accordance with a change in a channel matrix, includes: a generalized inverse vector matrix calculation unit for calculating a generalized inverse matrix of Moore-Penrose derived from a channel matrix indicative of a radiowave propagation environment; a search area limiting processing unit for performing weighting for each eigenvector calculated from the channel matrix in inverse proportion to a square root of an eigenvalue corresponding to the eigenvector, and determines the search area of the transmission signal vector centered at the generalized inverse matrix solution of Moore-Penrose based on the weighted result; and a most likelihood estimation unit for searching for a transmission signal vector by use of a most likelihood estimation based on the search area determined by the search area limiting processing unit.
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Citations
35 Claims
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1-13. -13. (canceled)
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14. A MIMO decoder comprising:
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generalized inverse matrix calculating means for calculating a generalized inverse matrix of Moore-Penrose derived from a channel matrix indicative of a radiowave propagation environment or a virtual channel matrix based on a virtual propagation path; and searching means for searching a transmission signal vector centered at a generalized inverse matrix solution calculated by said generalized inverse matrix calculating means, wherein a search area of the transmission signal vector is variable in response to a change in the channel matrix or the virtual channel matrix, and said searching means performs weighting for each eigen vector calculated from the channel matrix or the virtual channel matrix in inverse proportion to a square root of an eigen value corresponding to the eigen vector, and determines the search area of the transmission signal vector based on the weighted result. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A MIMO decoder comprising:
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minimum mean square error norm calculating means for executing processing based on a minimum mean square norm from a channel matrix indicative of a radiowave propagation environment or a virtual channel matrix based on a virtual propagation path; and searching means for searching a transmission signal vector centered at a detection result calculated by said minimum mean square error norm calculating means, wherein a search area of the transmission signal vector is variable in response to a change in the channel matrix or the virtual channel matrix, and said searching means performs weighting for each eigen vector calculated from the channel matrix or the virtual channel matrix in inverse proportion to a square root of an eigen value corresponding to the eigen vector, and determines the search area of the transmission signal vector based on the weighted result. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A MIMO decoding method comprising:
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a step of receiving a transmission signal to acquire a transmission signal vector; a step of calculating a generalized inverse matrix of Moore-Penrose derived from a channel matrix indicative of a radiowave propagation environment or a virtual channel matrix indicative of a virtual propagation path; a step of calculating an eigen value and an eigen vector based on the channel matrix or the virtual channel matrix; and a search step of searching the transmission signal vector centered at a generalized inverse matrix solution of Moore-Penrose, wherein a search area of the transmission signal vector is variable in response to a change in the channel matrix or the virtual channel matrix, and in said search step, weighting is performed for each eigen vector calculated from the channel matrix or the virtual channel matrix in inverse proportion to a square root of an eigen value corresponding to the eigen vector, and the search area of the transmission signal vector is determined based on the weighted result. - View Dependent Claims (29, 30, 31)
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32. A MIMO decoding method comprising:
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a step of receiving a transmission signal to acquire a transmission signal vector; executing processing based on a minimum mean square error norm from a channel matrix indicative of a radiowave propagation environment or a virtual channel matrix indicative of a virtual propagation path; a step of calculating an eigen value and an eigen vector based on the channel matrix or the virtual channel matrix; and a search step of searching the transmission signal vector centered at a detection result by the processing based on the minimum mean square error norm, wherein a search area of the transmission signal vector is variable in response to a change in the channel matrix or the virtual channel matrix, and in said search step, weighting is performed for each eigen vector calculated from the channel matrix or the virtual channel matrix in inverse proportion to a square root of an eigen value corresponding to the eigen vector, and the search area of the transmission signal vector is determined based on the weighted result. - View Dependent Claims (33, 34, 35)
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Specification