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CONTROL METHOD OF WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION APPARATUS, AND ADJUSTMENT METHOD OF ARRAY WEIGHT VECTOR

  • US 20120092217A1
  • Filed: 04/28/2010
  • Published: 04/19/2012
  • Est. Priority Date: 06/08/2009
  • Status: Active Grant
First Claim
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1. A control method of a wireless communication system comprising first and second communication devices, the second communication device comprising an antenna array, and an array weight vector (hereinafter “

  • AWV”

    ) control circuit that changes at least one of amplitudes and phases of transmission signals or received signals of a plurality of antenna elements included in the antenna array, the control method comprising;

    when an AWV of at least two antenna elements among the plurality of antenna elements included in the antenna array is independently controlled,(a) receiving, in the second communication device, while scanning a beam direction by changing an AWV of the antenna array of the second communication device, a training signal transmitted from the first communication device by using a fixed beam pattern;

    (b) determining at least one direction of arrival (DOA) in the second communication device based on reception signal characteristics of the training signal;

    (c) receiving, in the second communication device, the training signal transmitted by the first communication device while changing the AWV of the antenna array of the second communication device in such a manner that a null direction or a direction close to the null direction is successively pointed to one by one from the at least one DOA;

    (d) comparing a reception signal characteristic obtained in the step (a) with a reception signal characteristic obtained in the step (c) for each of the at least one DOA, and specifying a DOA for which a ratio or a difference between these reception signal characteristics is smaller than a predefined threshold;

    (e) obtaining at least one AWV each having a main beam direction or a sub-beam direction close to the main beam pointing to one of the at least one DOA in the second communication device determined in the step (b) except for the DOA specified in the step (d); and

    (f) using the at least one AWV obtained in the step (e) for communication between the first and second communication devices.

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