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Systems, methods, and devices for hybrid full-dimensional multiple-input multiple-output

  • US 9,787,376 B2
  • Filed: 09/26/2014
  • Issued: 10/10/2017
  • Est. Priority Date: 01/06/2014
  • Status: Active Grant
First Claim
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1. A UE configured to:

  • receive a channel state information reference signal (CSI-RS) from an evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (eNB);

    determine channel state information based on the CSI-RS and send the channel state information to the eNB, wherein the channel state information comprises a precoding matrix indicator corresponding to a first precoding matrix, wherein the first precoding matrix comprises a matrix used for closed-loop beamforming (Pd), and wherein Pd comprises a first dimension corresponding to a number of antenna ports and a second dimension corresponding to a number of layers;

    receive a UE specific reference (UE-RS) signal and a physical downlink shared channel (PDSCH) signal, wherein the UE specific reference signal is precoded with a second precoding matrix, wherein the second precoding matrix comprises a matrix used for open-loop beamforming (Pc), and wherein Pc comprises a first dimension corresponding to a number of transmitting antennas and a second dimension corresponding to the number of antenna ports;

    estimate a UE-RS effective channel comprising the second precoding matrix based on the UE-RS; and

    decode data from the PDSCH signal based on the first precoding matrix and the UE-RS effective channel.

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