Uplink signal transmission and reception using optimized rank 3 codebook
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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Abstract
A method for transmitting and receiving uplink signals using an optimized rank 3 codebook is disclosed. The optimized rank 3 codebook includes 6 precoding matrix groups, each of which has 1 variable having an amplitude of 1. Preferably, the optimized 4Tx rank 3 codebook has 12 precoding matrix, two precoding matrixes are selected from each the above 6 precoding matrix groups considering chordal distance and the number of precoding matrix.
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Citations
8 Claims
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1. A method for transmitting uplink signal via multiple antennas by a user equipment (UE), the method comprising:
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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 - View Dependent Claims (2, 3, 4)
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5. A user equipment (UE) for transmitting uplink signals via multiple antennas comprising:
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a radio frequency unit; and a processor, wherein the processor is configured to map the uplink signals to a plurality of layers, wherein the number of the plurality of layers is less or equal than the number of multiple antenna, to perform Discrete Fourier Transform (DFT) spreading upon each of uplink signals of the plurality of layers; to precode the DFT-spread uplink signals of the plurality of layers using a specific precoding matrix selected from a codebook; to generate a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol based on the precoded signals; and to transmit 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 - View Dependent Claims (6, 7, 8)
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Specification