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

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Noh, Yu Jin, Roh, Dong Wook, Kang, Byeong Woo, Kim, Bong Hoe, Lee, Dae Won
• Primary Examiner(s): VU, HOANG-CHUONG Q
• Application Number:
  US14/645,834
• Publication Number:
  US 20150188735A1
• Time in Patent Office: 208 Days
• Field of Search: 370/210, 370/328, 370/329, 370/344, 370/480, 370/481
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0404 the mobile station comprising multiple antennas, e.g. to provide uplink diversity
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0465 taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
• CPC Class Codes: H04B 7/0473 taking constraints in layer or codeword to antenna mapping into account
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/03923 according to the rank
• CPC Class Codes: H04L 25/03929 with layer mapping, e.g. codeword-to layer design for space-time coding H04L1/0618
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2615 Reduction thereof using coding
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04W 72/563 of the wireless resources

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.

Claims

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

2. The method according to claim 1, wherein the codebook is set to equalize transmission power of multiple antennas.

3. The method according to claim 1, wherein each of the precoding matrix groups is satisfied with a condition of Xε

{1, −

1}.

4. The method according to claim 1, wherein the codebook consists of precoding matrices of

5. A user equipment (UE) for transmitting uplink signals via multiple antennas comprising:

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

6. The user equipment (UE) according to claim 5, wherein the codebook is set to equalize transmission power of multiple antennas.

7. The user equipment (UE) according to claim 5, wherein each of the precoding matrix groups is satisfied with a condition of Xδ

{1, −

1}.

8. The user equipment (UE) according to claim 5, wherein the memory stores, as the codebook, precoding matrices of