METHOD AND APPARATUS FOR OPTIMZING ANTENNA PRECODER SELECTION WITH COUPLED ANTENNAS

• US 20160344460A1
• Filed: 02/04/2016
• Published: 11/24/2016
• Est. Priority Date: 02/07/2012
• Status: Active Grant

• Current Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Brown, Tyler A., Frank, Colin
• Granted Patent: US 10,090,901 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• 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 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• 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 and apparatus optimize antenna precoder selection with coupled antennas. A power metric corresponding to each precoder of a plurality of precoders can be received at a receiving device. Reference signals can be received. A transmission channel corresponding to each precoder can be estimated based on the reference signals. The estimate of the transmission channel can be scaled based on the power metric for each precoder. A channel quality metric for each precoder can be generated based on the scaled estimate of the transmission channel. An index of a precoder with the largest channel quality metric can be transmitted.

Claims

1. A method comprising:

receiving a power metric corresponding to each precoder of a plurality of precoders;

receiving reference signals;

estimating a transmission channel corresponding to each precoder based on the reference signals;

scaling the estimate of the transmission channel based on the power metric for each precoder;

generating a channel quality metric for each precoder based on the scaled estimate of the transmission channel; and

transmitting an index of a precoder with the largest channel quality metric.

2. The method according to claim 1, wherein the power metric comprises an estimated difference in power of each of a plurality of precoders from a reference precoder power.

3. The method according to claim 2, wherein scaling comprises scaling the estimate of the transmission channel based on a square root of the estimated difference in power of each precoder of the plurality of precoders.

4. The method according to claim 1, wherein the power metric comprises an estimated radiated power of each precoder of the plurality of precoders.

5. The method according to claim 1,

wherein the channel quality metric comprises a first channel quality metric,

wherein the method further comprises generating a second channel quality metric based on the reference signals, and

wherein transmitting the index further comprises transmitting the second quality metric for the indexed precoder with the largest first channel quality metric.

6. The method according to claim 1, further comprising comparing the channel quality metrics for each precoder with each other to determine a precoder with a largest channel quality metric.

7. The method according to claim 1, wherein the channel quality metric comprises at least one selected from a group of a Signal-to-Interference-plus-Noise Ratio (SINR), a Mean Mutual Information per Bit (MMIB), an Exponential Effective SINR Metric (EESM), a channel capacity, and a throughput estimate.

8. An apparatus comprising:

a transceiver to receive a power metric corresponding to each precoder of a plurality of precoders and to receive reference signals; and

a controller coupled to the transceiver, the controller to

estimate a transmission channel corresponding to each precoder based on the reference signals,

scale the estimate of the transmission channel based on the power metric for each precoder, and

generate a channel quality metric for each precoder based on the scaled estimate of the transmission channel,

wherein the transceiver transmits an index of a precoder with the largest channel quality metric.

9. The apparatus according to claim 8, wherein the power metric comprises an estimated difference in power of each of a plurality of precoders from a reference precoder power.

10. The apparatus according to claim 9, wherein scaling comprises scaling the estimate of the transmission channel based on a square root of the estimated difference in power of each precoder of the plurality of precoders.

11. The apparatus according to claim 8, wherein the power metric comprises an estimated radiated power of each precoder of the plurality of precoders.

12. The apparatus according to claim 8,

wherein the channel quality metric comprises a first channel quality metric,

wherein the controller generates a second channel quality metric based on the reference signals, and

wherein the transceiver transmits the index by transmitting the second quality metric for the indexed precoder with the largest first channel quality metric.

13. The apparatus according to claim 8, wherein the controller compares the channel quality metric for each precoder to determine a precoder with a largest channel quality metric.

14. The apparatus according to claim 8, wherein the channel quality metric comprises at least one selected from a group of Signal-to-Interference-plus-Noise Ratio (SINR), a Mean Mutual Information per Bit (MMIB), an Exponential Effective SINR Metric (EESM), a channel capacity, and a throughput estimate.

15. A method comprising:

generating a power metric corresponding to each precoder of a plurality of precoders;

transmitting the power metric;

transmitting reference signals; and

receiving an index of a precoder with a largest channel quality metric based on the power metric and the reference signals.

16. The method according to claim 15, wherein the power metric comprises an estimated difference in power of each of a plurality of precoders from a reference precoder power.

17. The method according to claim 15, wherein the power metric comprises an estimated radiated power of each precoder of the plurality of precoders.

18. The method according to claim 15,

wherein the channel quality metric comprises a first channel quality metric, and

wherein receiving comprises receiving a second channel quality metric along with the index of the precoder with a largest first channel quality metric.

19. An apparatus comprising:

a controller to generate a power metric corresponding to each precoder of a plurality of precoders; and

a transceiver to transmit the power metric, transmit reference signals, and receive an index of a precoder with a largest channel quality metric based on the power metric and the reference signals.

20. The apparatus according to claim 19, wherein the power metric comprises an estimated difference in power of each of a plurality of precoders from a reference precoder power or an estimated radiated power of each precoder of the plurality of precoders.