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Operation of terminal for multi-antenna transmission

  • US 9,214,997 B2
  • Filed: 11/26/2014
  • Issued: 12/15/2015
  • Est. Priority Date: 02/11/2009
  • Status: Active Grant
First Claim
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1. A method of transmitting one or more demodulation reference signals (DMRSs) for a Physical Uplink Shared Channel (PUSCH) at a User Equipment (UE) configured with a transmission mode for multiple transmit antennas in a radio communication system, the method comprising:

  • receiving Downlink Control Information (DCI) for scheduling of the PUSCH, wherein the DCI includes a 3-bit value related to Cyclic Shift (CS) for DMRS;

    determining N CS parameters based on the 3-bit value and a number of layers, wherein N is equal to the number of layers;

    determining N CS values α

    λ

    based on the N CS parameters by using the equation α

    λ

    =2π

    ·

    nCS,λ

    /12, wherein nCS,λ

    is a λ

    th CS parameter of the N CS parameters, λ

    is and integer in a range from 0 to N−

    1; and

    generating N DMRS sequences based on the N CS values α

    λ

    by using the expression e

    α

    λ

    ·

    n
    ·

    ru,v(n), wherein ru,v(n) is the base sequence, u is a group number, v is a base sequence number within a corresponding group, n is an integer in a range from 0 to NscRS

    1, and NscRS is a number of allocated subcarriers.

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