Method for Transmitting a Data Signal in a MIMO System
First Claim
1. A method for transmitting a data signal by a transmission unit of a wireless multiple-input/multiple-output (MIMO) communication system, the transmission unit comprising a plurality of transmission antennas, the method comprising:
- performing a first transmission of a data signal, the first transmission comprising transmitting the data signal by each one of the plurality of transmission antennas; and
performing a second transmission of the data signal at a time later than the first transmission, the second transmission comprising transmitting at least one spectrally modified signal variant of the data signal by at least one antenna of the plurality of transmission antennas.
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Accused Products
Abstract
A method for transmitting a data signal by a transmission unit of a wireless multiple-input/multiple-output (MIMO) communication system. The communication system includes the transmission unit and a reception unit, the transmission unit having a plurality of transmission antennas and the reception unit having a plurality of reception antennas. The method includes performing a first transmission of a data signal, the first transmission including transmitting the data signal by each one of the plurality of transmission antennas, and performing a second transmission of the data signal at a time later than the first transmission, the second transmission including transmitting at least one spectrally modified signal variant of the data signal by at least one antenna of the plurality of transmission antennas.
61 Citations
24 Claims
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1. A method for transmitting a data signal by a transmission unit of a wireless multiple-input/multiple-output (MIMO) communication system, the transmission unit comprising a plurality of transmission antennas, the method comprising:
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performing a first transmission of a data signal, the first transmission comprising transmitting the data signal by each one of the plurality of transmission antennas; and performing a second transmission of the data signal at a time later than the first transmission, the second transmission comprising transmitting at least one spectrally modified signal variant of the data signal by at least one antenna of the plurality of transmission antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for receiving a data signal by a reception unit of a wireless multiple-input/multiple-output (MIMO) communication system, the reception unit comprising a plurality of reception antennas the method comprising:
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receiving a first transmission of a data signal, the first transmission being represented by a first channel matrix; receiving a second transmission of the data signal at a time later than the first transmission, the second transmission comprising spectrally modified signal variants of the data signal and being represented by a second channel matrix; constructing a further channel matrix based on the second channel matrix, the further channel matrix comprising a rank that is higher than a rank of the first channel matrix; and decoding the transmitted data signal by means of the further channel matrix. - View Dependent Claims (17, 18)
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19. A transmission unit to transmit a data signal, comprising:
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a plurality of antennas; a first transmission device configured to perform a first transmission of a data signal, the first transmission comprising transmitting the data signal by each one of the plurality of transmission antennas; and a second transmission device configured to perform a second transmission of the data signal at a time later than the first transmission, the second transmission comprising transmitting at least one spectrally modified signal variant of the data signal by at least one antenna of the plurality of transmission antennas. - View Dependent Claims (20)
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21. A reception unit to receive a data signal, comprising:
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a plurality of antennas; a reception device configured to receive a first transmission of the data signal and a second transmission of the data signal, wherein the first transmission is represented by a first channel matrix and the second transmission comprises spectrally modified signal variants of the data signal and is represented by a second channel matrix; a construction device configured to construct a further channel matrix based on the second channel matrix, the further channel matrix comprising a rank that is higher than the rank of the first channel matrix; and a decoding device configured to decode the transmitted data signal by means of the further channel matrix.
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22. A method for transmitting a data signal by a transmission unit of a wireless multiple-input/multiple-output (MIMO) communication system, the transmission unit comprising a plurality of transmission antennas, the method comprising:
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performing a first transmission of the data signal by the plurality of transmission antennas, the data signal comprising a plurality of signal components, each transmission antenna transmitting a respective signal component of the data signal; selecting a subset of the plurality of transmission antennas to obtain selected transmission antennas which are transmission antennas belonging to the subset of the plurality of transmission antennas, and to obtain non-selected transmission antennas which are transmission antennas not belonging to the subset of the plurality of transmission antennas; pre-coding each of the signal components of the data signal transmitted by the selected transmission antennas with a respective pre-coding sequence to obtain spectrally modified variants of the signal components of the data signal; performing a second transmission of the data signal at a time later than the first transmission, the second transmission comprising transmitting by the selected transmission antennas the spectrally modified variants of the signal components of the data signal and re-transmitting by the non-selected transmission antennas the signal components of the data signal transmitted by the non-selected transmission antennas.
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23. A method for constructing a well-conditioned further channel matrix from a poorly conditioned first channel matrix and parts of a second poorly conditioned channel matrix comprising:
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constructing a first channel matrix based on received samples of a data signal comprising a plurality of signal components transmitted by a plurality of transmission antennas and received by a plurality of reception antennas, the first channel matrix being poorly conditioned; constructing a second channel matrix based on received samples of spectrally modified variants of signal components of the data signal being transmitted by the plurality of transmission antennas and received by the plurality of reception antennas, the second channel matrix being poorly conditioned; constructing a further channel matrix based on the received samples of the signal components of the data signal and based on parts of the received samples of the spectrally modified variants of the signal components of the data signal such that the further channel matrix is well-conditioned. - View Dependent Claims (24)
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Specification