METHOD AND DEVICE FOR WIRELESS COMMUNICATION USING MIMO TECHNIQUES
First Claim
1. A method for performing closed loop MIMO communication between two transceivers, the method comprising:
- performing sub-optimal linear unitary preprocessing of transmission signals in one of said transceivers, in transmission mode, for transmission of at least two MIMO streams, said linear preprocessing being computed through QR decomposition, or bi-diagonal decomposition and/or at least one Jacobi rotation of a channel related matrix; and
performing MMSE processing on received signals in a second of said transceivers in a receiving mode, to mitigate mutual interference between said MIMO streams, said MMSE processing including computation of an MMSE matrix with respect to said processed channel.
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Abstract
The present invention describes a method of closed loop MIMO communication utilizing implicit or explicit channel state information (CSI) at the transmitter and the receiver. The transmitter performs linear pre-processing (for example, QR decomposition or bi-diagonal decomposition or Jacobi rotations, and/or sporadic SVDs) on a channel matrix, and the receiver mitigates the mutual interference between the streams by performing MMSE processing on the received signals. The MMSE matrix is computed with respect to the processed channel that may estimated by the receiver through preprocessed pilot signals. The transmitters preprocessing is of much lesser cost and complexity than full SVD.
89 Citations
19 Claims
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1. A method for performing closed loop MIMO communication between two transceivers, the method comprising:
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performing sub-optimal linear unitary preprocessing of transmission signals in one of said transceivers, in transmission mode, for transmission of at least two MIMO streams, said linear preprocessing being computed through QR decomposition, or bi-diagonal decomposition and/or at least one Jacobi rotation of a channel related matrix; and performing MMSE processing on received signals in a second of said transceivers in a receiving mode, to mitigate mutual interference between said MIMO streams, said MMSE processing including computation of an MMSE matrix with respect to said processed channel. - View Dependent Claims (2, 3, 4, 5, 15)
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6. A method for performing closed loop MIMO communication between two transceivers, the method comprising:
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performing SVD in at least one of said transceivers, said step of performing SVD including calculating a narrowed search window for eigenvalues resulting from a majorization property of a diagonal with respect to eigen-values valid in a Hermitian matrix. - View Dependent Claims (16)
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7. A method for performing closed loop MIMO communication between two transceivers, the method comprising:
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performing non-SVD linear preprocessing of transmit signals in one of said transceivers, when in transmission mode; and performing MMSE processing on received signals in a second of said transceivers, when in receiving mode, to mitigate mutual interference between MIMO streams; said MMSE processing including computing an MMSE matrix with respect to said processed channel. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 17)
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18. A device for performing closed loop MIMO communication between two transceivers, the device comprising:
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a processor in a first of said transceivers for performing, in transmission mode, sub-optimal linear unitary preprocessing of transmission signals to be transmitted as at least two MIMO streams, said linear preprocessing being computed through QR decomposition, or bi-diagonal decomposition and/or at least one Jacobi rotation of a channel related matrix; and a processor in a second of said transceivers for performing, in reception mode, MMSE processing on signals from said first transceiver, to mitigate mutual interference between MIMO streams, said MMSE processing including computation of an MMSE matrix with respect to said processed channel. - View Dependent Claims (19)
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Specification