Wireless communications system, wireless communications apparatus, wireless communications method and computer program for wireless communication
First Claim
1. An electronic device operating as an access point, the electronic device comprising:
- a weight information calculating circuit configured to determine weight information based on pre-training information which has been received from a mobile device; and
a transmitter configured to apply the weight information to estimate channel conditions, and to transmit signals including the weight information applied to the mobile device so that the mobile device can determine operating parameters using the signals including the weight information applied.
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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.
27 Citations
20 Claims
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1. An electronic device operating as an access point, the electronic device comprising:
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a weight information calculating circuit configured to determine weight information based on pre-training information which has been received from a mobile device; and a transmitter configured to apply the weight information to estimate channel conditions, and to transmit signals including the weight information applied to the mobile device so that the mobile device can determine operating parameters using the signals including the weight information applied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method performed by an electronic device operating as an access point, the method comprising:
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obtaining, from a mobile device, pre-training information to be referenced for determining weight information; determining, with circuitry, the weight information based on the obtained pre-training information; applying, with the circuitry, the weight information to signals to estimate channel conditions for the mobile device; and transmitting, with the circuitry, to the mobile device, the signals to estimate the channel conditions for the mobile device after application of the weight information. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A non-transitory computer-readable medium including computer program instructions, which when executed by processing circuitry of an electronic device operating as an access point, cause the processing circuitry to perform a method comprising:
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obtaining, from a mobile device, pre-training information to be referenced for determining weight information; determining the weight information based on the obtained pre-training information; applying the weight information to signals to estimate channel conditions for the mobile device; and transmitting, with the circuitry, to the mobile device, the signals to estimate the channel conditions for the mobile device after application of the weight information.
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Specification