# US 2015/0092583 A1 · Methods and devices for determining effective mutual information > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0092583 A1 - Document ID: US20150092583A1 - Status: Published application - Kind: A1 - Application number: 14/499,478 - Filed: 2014-09-29 - Published: 2015-04-02 - Earliest claimed: 2013-09-30 - Assignees: Intel IP Corporation - Applicants: Intel IP Corporation - Inventors: Rajarajan Balraj; Holger Neuhaus; Axel Clausen; Ismael Gutierrez; Andreas Bury - Web page: https://patentgrep.com/patent/US20150092583A1 ## CPC - H04L 5/0057: {Physical resource allocation for CQI} - H04B 7/0417: Feedback systems - H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04B 7/0854: {using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion} - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/0073: {Allocation arrangements that take into account other cell interferences} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 25/0246: {with factorisation} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## 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 ### Claim 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. ### Claim 2 (depends on 1) The method of claim 1, comprising: determining channel estimates based on a noise and interference covariance measure of the composite signal. ### Claim 3 (depends on 2) 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. ### Claim 4 (depends on 2) 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. ### Claim 5 (depends on 2) 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. ### Claim 6 (depends on 1) 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. ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 7) The method of claim 7, further comprising: puncturing the second mutual information metric by using a weighting of zero. ### Claim 9 (depends on 7) 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. ### Claim 10 (depends on 1) 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. ### Claim 11 (depends on 10) 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. ### Claim 12 (depends on 11) 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. ### Claim 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. ### Claim 14 (depends on 13) 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. ### Claim 15 (depends on 13) The receiver circuit of claim 13, wherein the third unit is configured to determine channel estimates based on a noise and interference covariance measure. ### Claim 16 (depends on 15) The receiver circuit of claim 15, wherein the third unit is configured to determine the second mutual information metric based on the channel estimates. ### Claim 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. ### Claim 18 (depends on 17) 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. ### Claim 19 (depends on 17) The method of claim 17, comprising: puncturing the second mutual information metric. ### Claim 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. ### Claim 21 (depends on 20) 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. ### Claim 22 (depends on 20) 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. ### Claim 23 (depends on 20) 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. ### Claim 24 (depends on 23) 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.