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Multistage reception of code division multiple access transmissions

  • US 7,209,515 B2
  • Filed: 03/29/2002
  • Issued: 04/24/2007
  • Est. Priority Date: 03/30/2001
  • Status: Active Grant
First Claim
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1. In a communications network comprising a base station and a plurality of user equipment (UE), the network having at least one radio frequency communications path between each UE and the base station, the base station comprising a plurality of antennas and at least one base station reciever, a method of reducing multiple access interference in at least one radio frequency communications path between the base station and at least one UE, the method comprising:

  • interleaving space-time adaptive processing (STAP) and multi-user detection (MUD) in a first plurality of stages in a base station receiver, by;

    selecting at least one UE connection for MUD processing by stage, and in a second plurality of stages;

    demodulating the UE connections selected for MUD processing in a current stage, the demodulation employing STAP, andperforming MUD cancellation on UE connections selected for MUD processing in the current stage; and

    commanding transmit power for each UE connection, by;

    determining a base target Eb/N0 as a function of at least one data quality metric (DQM);

    estimating a received Eb/N0 for each UE connection, for each UE connection designated for MUD processing, adjusting the base target E0/N0 upward;

    for each UB connection not designated for MUD processing, where the estimated Eb/N0 is less than the base target Eb/N0, commanding increased UE connection transmit power; and

    for each UE connection designated for MUD processing, where the estimated Eb/N0 is less than the adjusted base target Eb/N0, commanding increased UE connection transmit power.

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