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System and method for power control and antenna grouping in a distributed-input-distributed-output (DIDO) network

  • US 10,187,133 B2
  • Filed: 06/16/2010
  • Issued: 01/22/2019
  • Est. Priority Date: 04/02/2004
  • Status: Active Grant
First Claim
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1. A machine-implemented method for adjusting communication in a wireless transmission system comprised of a multiple antenna system (MAS) with multi-user (MU) transmission (“

  • MU-MAS”

    ) network comprising a plurality of distributed antennas or wireless transceiver stations distributed throughout a cell or coverage area, and a plurality of client devices or users, the method comprising;

    applying MU-MAS precoding weights to one or more data streams to generate one or more precoded data streams;

    receiving input channel quality information (CQI) and/or channel state information (CSI) related to communication channels over which the precoded data streams are to be transmitted from the plurality of distributed antennas;

    determining a plurality of power scaling factors for the distributed antennas based on the CQI and/or CSI; and

    applying the power scaling factors to the precoded data streams following precoding in a way that every power scaling factor is applied to one of the plurality of distributed antennas;

    wherein the power scaling factor is applied to each of the data streams sent to every MU-MAS antenna and is dynamically adjusted such that an instantaneous per-antenna transmit power may rise above predefined maximum permissible exposure (MPE) limits but the average per-antenna power is maintained below the MPE limits.

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