METHODS AND DEVICES FOR DETERMINING EFFECTIVE MUTUAL INFORMATION

• US 20150092583A1
• Filed: 09/29/2014
• Published: 04/02/2015
• Est. Priority Date: 09/30/2013
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Balraj, Rajarajan, Neuhaus, Holger, Clausen, Axel, Gutierrez, Ismael, Bury, Andreas
• Granted Patent: US 9,544,121 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• 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
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 25/0246 with factorisation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic

Abstract

A method includes receiving at a receiver circuit a composite signal including non-interfered data resource elements and interfered data resource elements from a plurality of radio cells, and determining a first mutual information metric based on the non-interfered data resource elements. The method further includes determining a second mutual information metric based on the interfered data resource elements, and determining effective mutual information based on a combination of the first mutual information metric and the second mutual information metric.

Claims

1. A method, comprising:

receiving at a receiver circuit a composite signal comprising non-interfered data resource elements and interfered data resource elements from a plurality of radio cells;

determining a first mutual information metric based on the non-interfered data resource elements;

determining a second mutual information metric based on the interfered data resource elements; and

determining effective mutual information based on a combination of the first mutual information metric and the second mutual information metric.

2. The method of claim 1, comprising:

determining channel estimates based on a noise and interference covariance measure of the composite signal.

3. The method of claim 2, comprising:

determining the channel estimates based on a Cholesky decomposition of the noise and interference covariance measure of the composite signal.

4. The method of claim 2, comprising:

determining the channel estimates based on a power offset between the interfered data resource elements of the composite signal and a cell-specific reference signal received from a target radio cell comprised in the composite signal.

5. The method of claim 2, comprising:

determining a signal-to-interference-and-noise ratio based on the channel estimates for a particular subcarrier of a plurality of subcarriers and based on at least one of a modulation type, a precoder, and a rank.

6. The method of claim 1, wherein determining the second mutual information metric is based on a function of a signal-to-interference-and-noise ratio, wherein the function depends on a modulation type.

7. The method of claim 1, further comprising:

weighting the first mutual information metric with respect to a number of the non-interfered data resource elements; and

weighting the second mutual information metric with respect to a number of the interfered data resource elements.

8. The method of claim 7, further comprising:

puncturing the second mutual information metric by using a weighting of zero.

9. The method of claim 7, further comprising:

determining the effective mutual information based on a sum of the weighted first mutual information metric and the weighted second mutual information metric.

10. The method of claim 1, further comprising:

determining for each precoder in a baseband circuit associated with the receiver circuit and each rank a maximum weighted mutual information based on the effective mutual information subject to a maximum criterion with respect to modulation types.

11. The method of claim 10, further comprising:

determining for each rank an optimal precoder and corresponding effective mutual information based on a maximum criterion with respect to a sum of the maximum weighted mutual information over the precoders.

12. The method of claim 11, further comprising:

mapping the effective mutual information of the optimal precoders for each rank to a channel quality indicator table; and

determining a rank identifier configured to identify a rank optimizing a user equipment throughput.

13. A receiver circuit, comprising:

a first unit configured to receive a composite signal comprising non-interfered data resource elements and interfered data resource elements from a plurality of radio cells;

a second unit configured to determine a first mutual information metric based on the non-interfered data resource elements;

a third unit configured to determine a second mutual information metric based on the interfered data resource elements; and

a fourth unit configured to determine effective mutual information based on a combination of the first mutual information metric and the second mutual information metric.

14. The receiver circuit of claim 13,

wherein the third unit is configured to determine the second mutual information metric based on a noise and interference covariance matrix of the interfered data resource elements subject to an antenna port and a CRS shift configuration.

15. The receiver circuit of claim 13,

wherein the third unit is configured to determine channel estimates based on a noise and interference covariance measure.

16. The receiver circuit of claim 15,

wherein the third unit is configured to determine the second mutual information metric based on the channel estimates.

17. A method, comprising:

receiving a composite signal at a receiver circuit;

determining a first mutual information metric based on a first covariance measure;

determining a second mutual information metric based on a second covariance measure different from the first covariance measure; and

determining effective mutual information based on a combination of the first mutual information metric and the second mutual information metric.

18. The method of claim 17, wherein the composite signal comprises non-interfered data resource elements and interfered data resource elements received from a plurality of radio cells, wherein determining the first mutual information metric is based on the non-interfered data resource elements, and wherein determining the second mutual information metric is based on the interfered data resource elements.

19. The method of claim 17, comprising:

puncturing the second mutual information metric.

20. A mobile device, comprising:

a receiver circuit configured to receive a composite signal comprising non-interfered data resource elements and interfered data resource elements from a plurality of radio cells;

a baseband circuit configured to determine a first mutual information metric based on the non-interfered data resource elements, a second mutual information metric based on the interfered data resource elements and effective mutual information based on a combination of the first mutual information metric and the second mutual information metric; and

a transmitter circuit configured to modulate a baseband signal comprising the effective mutual information on a radio frequency carrier and to transmit the modulated baseband signal through an air link to a base station.

21. The mobile device of claim 20,

wherein the baseband circuit is configured to determine the second mutual information metric based on a noise and interference covariance matrix of the interfered data resource elements subject to an antenna port and a CRS shift configuration.

22. The mobile device of claim 20,

wherein the baseband circuit is configured to determine the effective mutual information based on a weighted sum of the first mutual information metric and the second mutual information metric.

23. The mobile device of claim 20,

wherein the baseband circuit is configured to determine the second mutual information metric with respect to cell-specific information received from the plurality of radio cells comprised in the data resource elements of the composite signal.

24. The mobile device of claim 23,

wherein the baseband circuit is configured to determine the second mutual information metric with respect to an antenna port and a reference signal shift comprised in the cell-specific information.