Wireless communication system, wireless communication device and wireless communication method, and computer program thereof
First Claim
1. A wireless communication system in which a transmitter having multiple antennas and a receiver having multiple antennas make a pair to multiplex signals for communication, wherein:
- the transmitter transmits a reference signal; and
the receiver, receiving the reference signal, calculates a channel matrix H, performs the singular value decomposition of the channel matrix H into UDVH to acquire a reception weight matrix UH, a diagonal matrix D, and a transmission weight matrix V, and processes a reception signal using the reception weight matrix UH, and, when cross talks are generated between channels, the receiver calculates cross talk gains, estimates cross talk signals from the cross talk gains, and cancels the cross talk signals of the reception signal.
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Abstract
The invention realizes an SVD-MIMO transmission having resistance to the variations in the channel characteristic, which saves the feedback from the receiver to the transmitter. The receiver updates the current one into a new channel matrix Hnew every 100 OFDM symbols, and performs the reception processing by updating the current one into a new decoding weight matrix Unew acquired by the singular value decomposition of the channel matrix Hnew. On the other hand, the transmitter continues to use the original transmission weight matrix V. The diagonal matrix D is turned into a non-diagonal matrix because of the variations in the channel characteristic, where the elements except for the diagonal elements take the values except for zero. This shows that cross talks are generated at this moment. The receiver acquires the cross talk gains, and cancels the cross talk signals of the reception signal to thereby realize the signal transmission without cross talks in consequence.
81 Citations
16 Claims
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1. A wireless communication system in which a transmitter having multiple antennas and a receiver having multiple antennas make a pair to multiplex signals for communication, wherein:
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the transmitter transmits a reference signal; and
the receiver, receiving the reference signal, calculates a channel matrix H, performs the singular value decomposition of the channel matrix H into UDVH to acquire a reception weight matrix UH, a diagonal matrix D, and a transmission weight matrix V, and processes a reception signal using the reception weight matrix UH, and, when cross talks are generated between channels, the receiver calculates cross talk gains, estimates cross talk signals from the cross talk gains, and cancels the cross talk signals of the reception signal. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless communication device having multiple antennas, which receives multiplexed signals from a transmitter having multiple antennas, the communication device comprising:
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a communication unit that transmits and receives signals;
a channel estimator that calculates a channel matrix H from a reference signal transmitted from the transmitter;
a singular value decomposition unit that performs the singular value decomposition of the channel matrix H into UDVH to acquire a reception weight matrix U, a diagonal matrix D, and a transmission weight matrix V;
a reception signal processor that processes a reception signal by using the reception weight matrix U;
a cross talk estimator that estimates cross talk gains to the channels each; and
a cross talk remover that estimates cross talk signals based on the cross talk gains, and removes the cross talk signals from the reception signal processed by the reception signal processor. - View Dependent Claims (7, 8, 9, 10)
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11. A wireless communication method for receiving multiplexed signals from a transmitter having multiple antennas by using multiple antennas, comprising:
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a channel estimating step that calculates a channel matrix H from a reference signal transmitted from the transmitter;
a singular value decomposition step that performs the singular value decomposition of the channel matrix H into UDVH to acquire a reception weight matrix U, a diagonal matrix D, and a transmission weight matrix V;
a reception signal processing step that processes a reception signal by using the reception weight matrix U;
a cross talk estimating step that estimates cross talk gains to the channels each; and
a cross talk removing step that estimates cross talk signals based on the cross talk gains, and removes the cross talk signals from the reception signal processed by the reception signal processing step. - View Dependent Claims (12, 13, 14, 15)
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16. A computer program described in a computer-readable format, in a manner that the processing for receiving multiplexed signals from a transmitter having multiple antennas with multiple antennas is executed on a computer system, comprising:
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a channel estimating step that calculates a channel matrix H from a reference signal transmitted from the transmitter;
a singular value decomposition stop that performs the singular value decomposition of the channel matrix H into UDVH to acquire a reception weight matrix UH, a diagonal matrix D, and a transmission weight matrix V;
a reception signal processing step that processes a reception signal by using the reception weight matrix UH;
a cross talk estimating step that estimates cross talk gains to the channels each; and
a cross talk removing step that estimates cross talk signals based on the cross talk gains, and removes the cross talk signals from the reception signal processed in the reception signal processing step.
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Specification