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Interference management, handoff, power control and link adaptation in distributed-input distributed-output (DIDO) communication systems

  • US 10,200,094 B2
  • Filed: 06/16/2010
  • Issued: 02/05/2019
  • Est. Priority Date: 04/02/2004
  • Status: Active Grant
First Claim
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1. A multiuser (MU) multiple antenna system (MU-MAS) comprising:

  • one or more centralized units communicatively coupled to a plurality of distributed wireless transceivers via a network;

    the network carrying baseband or radio frequency (RF) signals; and

    one or a plurality of precoding units that generate a plurality of precoded waveforms;

    wherein the distributed wireless transceivers comprise baseband or RF units to transform the precoded waveforms into a plurality of RF signals and cooperate to coordinate the transmission of the RF signals to jointly create a plurality of concurrent locations in space with zero RF energy;

    the system further comprising;

    a main MU-MAS cluster having at least one base transceiver station (BTS) connected to a first plurality of antennas for communicating with a target user, wherein the BTSs in the main MU-MAS cluster implement MU-MAS precoding to transmit simultaneous non-interfering data streams within the same frequency band to a first plurality of MU-MAS users including the target user; and

    one or more interfering MU-MAS clusters, each interfering MU-MAS cluster having at least one BTS connected to a second plurality of antennas communicating with a second plurality of MU-MAS users, wherein the BTSs in the interfering MU-MAS cluster implement MU-MAS precoding to transmit simultaneous non-interfering data streams within the same frequency band to the second plurality of MU-MAS users;

    wherein when the target user is located within a zone in which the target user is transmitting and receiving data streams to and from the antennas in the main MU-MAS cluster, respectively, and is also detecting RF signals transmitted from the antennas in the interfering MU-MAS cluster, the BTSs in the interfering MU-MAS cluster implement MU-MAS precoding with inter-MU-MAS-cluster interference (IMCI) cancellation to avoid RF interference at the target user.

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