WIRELESS COMMUNICATIONS SYSTEM, WIRELESS COMMUNICATIONS APPARATUS, WIRELESS COMMUNICATIONS METHOD AND COMPUTER PROGRAM FOR WIRELESS COMMUNICATION
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Accused Products
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
31 Claims
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1. (canceled)
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2. A first electronic device having a first spatial multiplexing decoding capability, comprising:
circuitry configured to receive and process a data packet including preamble signals, training signals and data signals in this order, 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 a second electronic device to the first electronic device, the training signals being received from the second 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 first electronic device; the training signals are used to estimate channel state; a number of the training signals which are sequentially received is determined based on information associated with the first spatial multiplexing decoding capability being transmitted to the second electronic device before receiving the data packet; and the weight matrix is calculated using a maximum signal to noise ratio, a zero-forcing, or a singular value decomposition. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. 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 including a spatial multiplexing decoding capability of the another electronic device; and transmit a data packet including the preamble signals, the training signals and the data signals in this order to the another electronic device, on the sub-carrier, wherein the circuitry is further configured to; generate preamble signals used for at least one of signal detection, synchronization or adjustment of gain for the another electronic device; and 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, the training signals being used to estimate channel state, and a number of the training signals being determined based on the spatial multiplexing decoding capability of the another electronic device, wherein each of the training signals are transmitted to the another electronic device at different timings, and wherein the weight matrix is calculated using a maximum signal to noise ratio, a zero-forcing, or a singular value decomposition. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification