Wireless communications system, wireless communications apparatus, wireless communications method and computer program for wireless communication
AssigneeSony Corporation
InventorShinichi Kuroda
Life of this patent
Estimating the term…
Abstract
In performing SVD-MIMO transmission, a set-up procedure is simplified while assuring a satisfactory decoding capability with a reduced number of antennas. A transmitter estimates channel information based on reference signals sent from a receiver, determines a transmit antenna weighting coefficient matrix based on the channel information, calculates a weight to be assigned to each of components of a multiplexed signal, and sends, to the receiver, training signals for respective signal components, the training signals being weighted by the calculated weights. On the other hand, the receiver determines a receive antenna weighting coefficient matrix based on the received training signals.
Claims23
An electronic device comprising:
- circuitry configured to
- receive training signals weighted by weights included in a weight matrix, the weight matrix being set to weight data signals to be transmitted on an Orthogonal Frequency-Division Multiplexing (OFDM) sub-carrier from another electronic device to the electronic device, wherein the training signals are received from the another electronic device before data signals on the sub-carrier;
- and
- receive preamble signals that are not weighted by the weights included in the weight matrix prior to receiving the training signals on the sub-carrier, wherein
- the training signals are used to estimate channel state information, and the preamble signals are for at least one of signal detection synchronization or adjustment of gain at the electronic device.
A mobile apparatus comprising:
- a plurality of antennas;
- and
- a receiver configured to
- receive training signals weighted by weights included in a weight matrix, the weight matrix being set to weight data signals to be transmitted on an Orthogonal Frequency-Division Multiplexing (OFDM) sub-carrier from another electronic device to the electronic device, wherein the training signals are received from the another electronic device before data signals on the sub-carrier;
- and
- receive preamble signals that are not weighted by the weights included in the weight matrix prior to receiving the training signals on the sub-carrier, wherein
- the training signals are used to estimate channel state information, and the preamble signals are for at least one of signal detection synchronization or adjustment of gain at the mobile apparatus.
A method performed by an electronic device, the method comprising:
- receiving, by circuitry of the electronic device, training signals weighted by weights included in a weight matrix, the weight matrix being set to weight data signals to be transmitted on an Orthogonal Frequency-Division Multiplexing (OFDM) sub-carrier from another electronic device to the electronic device, wherein the training signals are received from the another electronic device before data signals on the sub-carrier;
- and
- receiving, by the circuitry, preamble signals that are not weighted by the weights included in the weight matrix prior to receiving the training signals on the sub-carrier, wherein
- the training signals are used to estimate channel state information, and the preamble signals are for at least one of signal detection synchronization or adjustment of gain at the electronic device.
A non-transitory computer-readable medium including computer program instructions, which when executed by an electronic device, cause the electronic device to:
- receive training signals weighted by weights included in a weight matrix, the weight matrix being set to weight data signals to be transmitted on an Orthogonal Frequency-Division Multiplexing (OFDM) sub-carrier from another electronic device to the electronic device, wherein the training signals are received from the another electronic device before data signals on the sub-carrier;
- and
- receive preamble signals that are not weighted by the weights included in the weight matrix prior to receiving the training signals on the sub-carrier, wherein
- the training signals are used to estimate channel state information, and the preamble signals are for at least one of signal detection synchronization or adjustment of gain at the electronic device.
Dependencies are inferred from the claim text.