MIMO communication method, transmitting device, and receiving device
AssigneesSony Corporation, Sony Mobile Communications Inc.
InventorShigeo Kusunoki
Life of this patent
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Abstract
A Multiple Input Multiple Output (MIMO) communication method and system for performing communication between N (N is an integer greater than or equal to 2) transmitting devices each having a transmit antenna and at least one receiving device having N receive antennas by using a multi-user MIMO scheme. The method includes dividing the N transmitting devices into a plurality of sets, and assigning an orthogonal code to each set of transmitting devices as a digital signal sequence to be transmitted by each of the transmitting devices, and arranging the digital signal sequences to be transmitted by the transmitting devices in a frequency axis direction in which an inverse fast Fourier transform is performed, and performing coding.
Claims15
A Multiple Input Multiple Output (MIMO) communication method for performing communication between N (N is an integer greater than or equal to 2) mobile communication devices each having a transmit antenna and at least one base station device having N receive antennas by using a multi-user MIMO scheme, the MIMO communication method comprising:
- dividing the N mobile communication devices into a plurality of sets, at least one of the sets including at least two mobile communication devices, and assigning a plurality of OVSF codes, from among a plurality of orthogonal OVSF codes that are spread to have an orthogonal relationship, to each set of mobile communication devices as a digital signal sequence to be transmitted by each of the mobile communication devices, wherein the plurality of OVSF codes assigned to each set of mobile communications includes at least a first order OVSF code and a pair of second order OVSF codes which share the single first order OVSF code as a root;
- and
- arranging the digital signal sequences to be transmitted by the mobile communication devices in a frequency domain in which an inverse fast Fourier transform is performed, and performing coding, wherein each of an in-phase and quadrature portion of a transmit data stream is multiplied by the assigned codes at each mobile communication device prior to each mobile communication device performing the inverse fast Fourier transform, wherein the first order OVSF code and the pair of second order OVSF codes are multiplied with different portions of the transmit data stream in a multiplexed manner.
A mobile communication device used for a multi-user MIMO scheme in which N (N is an integer greater than or equal to 2) mobile communication devices divided into a plurality of sets are used, at least one of the sets including at least two mobile communication devices, and perform wireless communication with at least one base station device having N receive antennas, the mobile communication device comprising:
- circuitry configured to
- generate a digital signal sequence to be transmitted, using a plurality of OVSF codes, from among a plurality of orthogonal OVSF codes that are spread to have an orthogonal relationship, assigned to each of the sets, wherein the plurality of OVSF codes assigned to each set of mobile communications includes at least a first order OVSF code and a pair of second order OVSF codes which share the single first order OVSF code as a root;
- assign the obtained orthogonal OVSF codes to each frequency on a frequency domain, perform an inverse fast Fourier transform, and generate an OFDM signal;
- transmit, as a radio frequency signal, the generated OFDM signal through the transform;
- and
- a transmit antenna connected to the circuitry,
- wherein each of an in-phase and quadrature portion of a transmit data stream is multiplied by the assigned codes prior to performing the inverse fast Fourier transform, wherein the first order OVSF code and the pair of second order OVSF codes are multiplied with different portions of the transmitted data stream in a multiplexed manner.
A base station device used for a multi-user MIMO scheme comprising:
- N receive antennas that receive signals transmitted from N (N is an integer greater than or equal to 2) mobile communication devices divided into a plurality of sets, at least one of the sets including at least two mobile communication devices, wherein
- the signals received by the receive antennas include
- a signal obtained by performing an inverse fast Fourier transform on a digital signal sequence using a plurality of OVSF codes, from among a plurality of orthogonal OVSF codes that are spread to have an orthogonal relationship, assigned to mobile communication devices in each of the plurality of sets into which the N mobile communication devices are divided, wherein the plurality of OVSF codes assigned to each set of mobile communications includes at least a first order OVSF code and a pair of second order OVSF codes which share the single first order OVSF code as a root,
- wherein each of an in-phase and quadrature portion of a transmit data stream is multiplied by the assigned codes at each mobile communication device prior to each mobile communication device performing the inverse fast Fourier transform, wherein the first order OVSF code and the pair of second order OVSF codes are multiplied with different portions of the transmit data stream in a multiplexed manner.
Dependencies are inferred from the claim text.