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Wireless communications system, wireless communications apparatus, wireless communications method and computer program for wireless communication

  • US 10,673,655 B2
  • Filed: 06/24/2019
  • Issued: 06/02/2020
  • Est. Priority Date: 11/05/2003
  • Status: Active Grant
First Claim
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1. 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, 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 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 OFDM 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.

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