Method and precoder information feedback in multi-antenna wireless communication systems

• US 9,203,489 B2
• Filed: 06/24/2013
• Issued: 12/01/2015
• Est. Priority Date: 05/05/2010
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Sayana, Krishna Kamal, Zhuang, Xiangyang
• Primary Examiner(s): NEFF, MICHAEL R
• Application Number:
  US13/924,838
• Publication Number:
  US 20140376652A1
• Time in Patent Office: 890 Days
• Field of Search: 375/267
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0469 taking special antenna structures, e.g. cross polarized antennas into account
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• 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

Abstract

A method for two component feedback in wireless communication systems is disclosed, with a wireless communication device sending a first representation of a first matrix chosen from a first codebook, wherein the first matrix has at least two columns, the wireless communication device sending a second representation of a second matrix chosen from a second codebook, and the base station obtaining a precoder from the first representation and the second representation.

Claims

1. A wireless communication device configured for sending precoder matrix information to a base station, the device comprising:

a transmitter configured for sending a first representation of a first matrix chosen from a first codebook, wherein the first matrix has at least two column vectors, and for sending a second representation of a second matrix chosen from a second codebook;

wherein the first representation and the second representation together convey a precoder matrix of one or more vectors associated with one or more spatial layers, the precoder matrix comprises a first sub-precoder matrix including a first set of weights on a first subset of transmit antennas of the base station, and a second sub-precoder matrix including a second set of weights on a second subset of transmit antennas of the base station, wherein the first and the second subsets of transmit antennas of the base station are non-overlapping; and

wherein the first sub-precoder matrix is one or more column vectors of the first matrix corresponding to the first representation, multiplied by one or more entries of the second matrix corresponding to the second representation, and the second sub-precoder matrix is one or more column vectors of the first matrix corresponding to the first representation, multiplied by one or more entries of the second matrix corresponding to the second representation.

2. The wireless communication device of claim 1, wherein the first matrix has at least two column vectors and wherein the at least two column vectors are different.

3. The wireless communication device of claim 1, wherein the wireless communication device is further configured for sending, via the transmitter, the first representation of the first matrix chosen from the first codebook, wherein the first representation is an index of the chosen matrix in the first codebook.

4. The wireless communication device of claim 1, wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second representation is an index of the chosen matrix in the second codebook.

5. The wireless communication device of claim 1, wherein the wireless communication device is further configured for sending the first representation of the first matrix chosen from the first codebook, wherein the first codebook includes a set of matrices whose column vectors are Discrete Fourier Transform (DFT) vectors.

6. The wireless communication device of claim 1, wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second matrix has at least two entries that have different and non-zero amplitude.

7. The wireless communication device of claim 1, wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second matrix has the same vector norm of each row of the second matrix.

8. The wireless communication device of claim 1, wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second matrix has the same vector norm of each column of the second matrix.

9. The wireless communication device of claim 1, wherein the wireless communication device is further configured for sending, via the transmitter, the second representation of the second matrix chosen from the second codebook, wherein the second matrix comprises entries that are co-phasing factors associated with the first sub-precoder matrix and the second sub-precoder matrix.