PRECODING MATRIX CODEBOOK DESIGN FOR ADVANCED WIRELESS COMMUNICATIONS SYSTEMS

• US 20140301492A1
• Filed: 03/06/2014
• Published: 10/09/2014
• Est. Priority Date: 03/08/2013
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Xin, Yan, Nam, Young-Han, Zhang, Jianzhong, Rahman, Md Saifur
• Application Number:
  US14/199,793
• Publication Number:
  US 20140301492A1
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• 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

Methods and apparatus of constructing rank-1 and/or rank-2 codebooks for advanced communication systems with 4 transmit antennas and two-dimensional (2D) M×N transmit antenna elements are provided. A double-codebook structure is considered for 4-Tx antenna configuration. Single-codebook and double-codebook structures are considered for two-dimensional (2D) M×N transmit antenna elements.

Claims

1. A method comprising:

transmitting, by a base station (BS) via antenna array, a plurality of signals to at least one user equipment (UE); and

applying a codebook to the plurality of signals prior to transmitting, wherein the codebook is designed with one-dimensional 4-Tx and two-dimensional M×

N antenna elements.

2. The method of claim 1, wherein transmitting comprising transmitting via a two dimensional (2D) antenna array comprising a number M of antenna elements and N antenna ports configured in a 2D grid NH×

NV and wherein the codebook comprises a double codebook W₁W₂.

3. The method of claim 1, wherein transmitting comprising transmitting via a two dimensional (2D) antenna array comprising a number M of antenna elements and N antenna ports configured in a 2D grid NH×

NV and wherein the codebook comprises a single codebook W.

4. The method of claim 1, wherein transmitting comprising transmitting via a two dimensional (2D) antenna array comprising a number M of antenna elements and N antenna ports configured in a 2D grid NH×

NV and wherein the codebook comprises a rank 1 double codebook W₁W₂.

5. The method of claim 4, wherein a rank 1 codebook comprises non-evenly oversampled DFT vectors.

6. The method of claim 4, wherein the rank 1 double codebook includes the vectors that are a Kronecker product of the horizontal steering vectors and the vertical steering vectors by uniformly quantizing the functions of elevation and azimuth angles.

7. The method of claim 6, wherein the rank 1 double codebook includes the Kronecker product of the horizontal and vertical steering vectors constructed by non-uniformly quantizing the functions of elevation and azimuth angles.

8. The method of claim 6, wherein the rank 1 double codebook includes at least one of:

the horizontal and elevation steering vectors that use the dependency between elevation and azimuth angles;

the horizontal and elevation steering vectors constructed by uniformly quantizing elevation and azimuth angles; and

the outer codebook W₂ based on co-phasing factors depending on the beam selection index and the number of times of beams appearing in codewords.

9. The method of claim 6, wherein the rank 1 double codebook is configurable for low-rise and high-rise scenarios.

10. For use in a wireless communication network, a base station comprising:

a two dimensional (2D) antenna array comprising a number M of antenna elements and N antenna ports configured in a 2D grid NH×

NV, the 2D antenna array configured to communicate with at least one subscriber station; and

a controller configured to apply a codebook to the signal, wherein the codebook is designed with one-dimensional 4-Tx and two-dimensional M×

N antenna elements.

11. The base station of claim 10, wherein the 2D antenna array comprises a 4-Tx antenna array and wherein the codebook comprises a double codebook W₁W₂ with one-dimensional 4-Tx is applied, the double codebook comprising an inner codebook W₁ and an outer codebook W₂.

12. The base station of claim 10, wherein the 2D antenna array comprises a number M of antenna elements and N antenna ports configured in a 2D grid NH×

NV and wherein the codebook comprises a double codebook W₁W₂.

13. The base station of claim 10, wherein the 2D antenna array comprises a number M of antenna elements and N antenna ports configured in a 2D grid NH×

NV and wherein the codebook comprises a single codebook W.

14. The base station of claim 10, wherein the 2D antenna array comprises a number M of antenna elements and N antenna ports configured in a 2D grid NH×

NV and wherein the codebook comprises a rank 1 double codebook W₁W₂.

15. The base station of claim 14, wherein a rank 1 codebook comprises non-evenly oversampled DFT vectors.

16. The base station of claim 14, wherein the rank 1 double codebook includes the vectors that are a Kronecker product of the horizontal steering vectors and the vertical steering vectors by uniformly quantizing the functions of elevation and azimuth angles.

17. The base station of claim 16, wherein the rank 1 double codebook includes the Kronecker product of the horizontal and vertical steering vectors constructed by non-uniformly quantizing the functions of elevation and azimuth angles.

18. The base station of claim 16, wherein the rank 1 double codebook includes at least one of:

the horizontal and elevation steering vectors that use the dependency between elevation and azimuth angles; and

the horizontal and elevation steering vectors constructed by uniformly quantizing elevation and azimuth angles.

19. The base station of claim 16, wherein the rank 1 double codebook is configurable for low-rise and high-rise scenarios.

20. The base station of claim 16, wherein the rank 1 double codebook includes the outer codebook W₂ based on co-phasing factors depending on the beam selection index and the number of times of beams appearing in codewords.