Wireless communications system, wireless communications apparatus, wireless communications method and computer program for wireless communication
First Claim
1. An electronic device having a first spatial multiplexing decoding capability, the electronic device comprising:
- circuitry configured to receive and process a data packet including, in sequential order, preamble signals, training signals and data signals, whereinthe training signals are weighted by weights included in a weight matrix for spatial multiplexing, the weight matrix being set to weight the data signals to be transmitted on an Orthogonal Frequency-Division Multiplexing (OFDM) sub-carrier from another electronic device to the electronic device, the training signals being received from the another electronic device before the data signals on the sub-carrier,the preamble signals are for use of at least one of signal detection, synchronization or adjustment of gain at the electronic device,the training signals are used to estimate channel state, anda number of the training signals which are sequentially received is based on information associated with the spatial multiplexing decoding capability being transmitted to the another electronic device before receiving the data packet, whereinthe preamble signals are not weighted by the weights included in the weight matrix prior to receiving the training signals on the OFDM sub-carrier.
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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.
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Citations
28 Claims
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1. An electronic device having a first spatial multiplexing decoding capability, the electronic device comprising:
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circuitry configured to receive and process a data packet including, in sequential order, preamble signals, training signals and data signals, wherein the training signals are weighted by weights included in a weight matrix for spatial multiplexing, the weight matrix being set to weight the data signals to be transmitted on an Orthogonal Frequency-Division Multiplexing (OFDM) sub-carrier from another electronic device to the electronic device, the training signals being received from the another electronic device before the data signals on the sub-carrier, the preamble signals are for use of at least one of signal detection, synchronization or adjustment of gain at the electronic device, the training signals are used to estimate channel state, and a number of the training signals which are sequentially received is based on information associated with the spatial multiplexing decoding capability being transmitted to the another electronic device before receiving the data packet, wherein the preamble signals are not weighted by the weights included in the weight matrix prior to receiving the training signals on the OFDM sub-carrier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An electronic device having a spatial multiplexing decoding capability, comprising:
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circuitry configured to; receive information from another electronic device, the information indicating a spatial multiplexing decoding capability of the another electronic device; generate preamble signals, which are used for at least one of signal detection, synchronization or adjustment of gain for the another electronic device; generate training signals weighted by weights included in a weight matrix for spatial multiplexing, the weight matrix being set to weight data signals to be transmitted on an Orthogonal Frequency-Division Multiplexing (OFDM) sub-carrier from the electronic device to the another electronic device; and transmit a data packet including, in sequential order, the preamble signals, the training signals and data signals to the another electronic device on the OFDM sub-carrier, wherein the training signals are used to estimate channel state, and a number of the training signals is determined based on the spatial multiplexing decoding capability of the another electronic device, and each of the training signals are transmitted to the another electronic device at different timings, wherein the preamble signals are not weighted by the weights included in the weight matrix. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification