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Uplink signal transmission and reception using optimized rank 3 codebook

  • US 9,154,343 B2
  • Filed: 03/12/2015
  • Issued: 10/06/2015
  • Est. Priority Date: 04/13/2009
  • Status: Active Grant
First Claim
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1. A method for transmitting uplink signal via multiple antennas by a user equipment (UE), the method comprising:

  • mapping the uplink signals to a plurality of layers, wherein the number of the plurality of layers is less or equal than the number of the multiple antennas;

    performing Discrete Fourier Transform (DFT) spreading upon each of uplink signals of the plurality of layers;

    precoding the DFT-spread uplink signals of the plurality of layers using a specific precoding matrix selected from a codebook;

    generating a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol based on the precoded signals; and

    transmitting the SC-FDMA symbol to a base station (BS) via the multiple antennas,wherein when the number of the plurality of layers is three and the number of the multiple antennas is four, the codebook consists of precoding matrix groups of

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