# US 11,445,518 B2 · Methods and apparatus for adaptive whitening > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,445,518 B2 - Document ID: US11445518B2 - Status: Granted - Kind: B2 - Application number: 17/103,418 - Filed: 2020-11-24 - Published: 2021-05-27 - Granted: 2022-09-13 - Earliest claimed: 2019-11-25 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Igor Gutman; Guy Wolf; Shay Landis; Gideon Kutz; Sharon Levy; Yehonatan Dallal - Web page: https://patentgrep.com/patent/US11445518B2 ## CPC - H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) - H04W 72/541: using the level of interference - H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0073: {Allocation arrangements that take into account other cell interferences} - H04L 25/03993: {Noise whitening} - H04J 11/005: {of intercell interference} - H04L 5/001: {the frequencies being arranged in component carriers} - 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 25/0224: {using sounding signals} - H04L 27/2602: {Signal structure} - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) ## Abstract Aspects are provided which allow a UE to apply a modified interference cleaning data to account for differences in interference between at least one pilot resource and at least one data resource, thereby improving data decoding performance of the UE. The UE receives at least one pilot resource and at least one data resources from a base station and identifies interference cleaning data based on the pilot resource. The UE then determines whether a first interference affecting the pilot resource is the same as a second interference affecting the data resource. When the first interference is the same as the second interference, the UE applies the interference cleaning data to the data resource. Otherwise, when the first interference is different than the second interference, the apparatus applies a modified interference cleaning data to the data resource. ## Claims ### Claim 1 A method of wireless communication of a user equipment (UE), comprising: receiving at least one pilot resource and at least one data resource from a base station; identifying interference cleaning data for the at least one pilot resource; determining whether a first interference affecting the at least one pilot resource is a same interference as a second interference affecting the at least one data resource based on identifying a transmission power difference between the at least one pilot resource and the at least one data resource; applying the interference cleaning data to the at least one data resource when the first interference is the same interference as the second interference, the interference cleaning data being applied to the at least one data resource when the transmission power difference is less than a threshold power; and applying modified interference cleaning data to the at least one data resource when the first interference is different than the second interference, the modified interference cleaning data being applied to the at least one data resource when the transmission power difference is greater than the threshold power. ### Claim 2 (depends on 1) The method of claim 1, wherein the interference cleaning data is a whitening transform matrix. ### Claim 3 (depends on 1) The method of claim 1, wherein the modified interference cleaning data comprises a diagonal matrix, and the modified interference cleaning data is identified by nulling off-diagonal elements of a noise covariance matrix from which the interference cleaning data is identified, the noise covariance matrix being estimated from the at least one pilot resource. ### Claim 4 (depends on 1) The method of claim 1, wherein the at least one pilot resource comprises a demodulation reference signal (DMRS). ### Claim 5 (depends on 4) The method of claim 4, wherein the modified interference cleaning data comprises a matrix resulting from an inverse of Rdiagnn wherein Rdiagnn is a result of zeroing off-diagonal elements of a Rnn matrix; and wherein the Rnn matrix is a noise covariance matrix estimated from the DMRS. ### Claim 6 (depends on 1) The method of claim 1, wherein the at least one data resource comprises information on a physical downlink shared channel (PDSCH). ### Claim 7 (depends on 1) The method of claim 1, wherein the base station is in a serving cell, and wherein the first interference and the second interference are from a neighbor cell. ### Claim 8 (depends on 7) The method of claim 7, wherein the at least one pilot resource comprises a first pilot resource from the serving cell, and the first pilot resource is received in a different symbol than a second pilot resource from the neighbor cell. ### Claim 9 An apparatus for wireless communication of a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: receive at least one pilot resource and at least one data resource from a base station; identify interference cleaning data for the at least one pilot resource; determine whether a first interference affecting the at least one pilot resource is a same interference as a second interference affecting the at least one data resource based on identifying a transmission power difference between the at least one pilot resource and the at least one data resource; apply the interference cleaning data to the at least one data resource when the first interference is the same interference as the second interference, the interference cleaning data being applied to the at least one data resource when the transmission power difference is less than a threshold power; and apply modified interference cleaning data to the at least one data resource when the first interference is different than the second interference, the modified interference cleaning data being applied to the at least one data resource when the transmission power difference is greater than the threshold power. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the interference cleaning data is a whitening transform matrix. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the modified interference cleaning data comprises a diagonal matrix, and the modified interference cleaning data is identified by nulling off-diagonal elements of a noise covariance matrix from which the interference cleaning data is identified, the noise covariance matrix being estimated from the at least one pilot resource. ### Claim 12 (depends on 9) The apparatus of claim 9, wherein the at least one pilot resource comprises a demodulation reference signal (DMRS). ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the modified interference cleaning data comprises a matrix resulting from an inverse of Rdiagnn wherein Rdiagnn is a result of zeroing off-diagonal elements of a Rnn matrix; and wherein the Rnn matrix is a noise covariance matrix estimated from the DMRS. ### Claim 14 A method of wireless communication of a base station, comprising: receiving at least one pilot resource and at least one data resource from a user equipment (UP; identifying interference cleaning data for the at least one pilot resource; determining whether a first interference affecting the at least one pilot resource is a same interference as a second interference affecting the at least one data resource based on identifying a transmission power difference between the at least one pilot resource and the at least one data resource; applying the interference cleaning data to the at least one data resource when the first interference is the same interference as the second interference, the interference cleaning data being applied to the at least one data resource when the transmission power difference is less than a threshold power; and applying modified interference cleaning data to the at least one data resource when the first interference is different than the second interference, the modified interference cleaning data being applied to the at least one data resource when the transmission power difference is greater than the threshold power. ### Claim 15 (depends on 14) The method of claim 14, wherein the interference cleaning data is a whitening transform matrix. ### Claim 16 (depends on 14) The method of claim 14, wherein the modified interference cleaning data comprises a diagonal matrix, and the modified interference cleaning data is identified by nulling off-diagonal elements of a noise covariance matrix from which the interference cleaning data is identified, the noise covariance matrix being estimated from the at least one pilot resource. ### Claim 17 (depends on 14) The method of claim 14, wherein the at least one pilot resource comprises a demodulation reference signal (DMRS). ### Claim 18 (depends on 17) The method of claim 17, wherein the modified interference cleaning data comprises a matrix resulting from an inverse of Rdiagnn, wherein Rdiagnn is a result of zeroing off-diagonal elements of a Rnn matrix; and wherein the Rnn matrix is a noise covariance matrix estimated from the DMRS. ### Claim 19 (depends on 14) The method of claim 14, wherein the at least one data resource comprises information on a physical uplink shared channel (PUSCH). ### Claim 20 (depends on 14) The method of claim 14, wherein the UE is in a serving cell, and wherein the first interference and the second interference are from a neighbor cell. ### Claim 21 (depends on 20) The method of claim 20, wherein the at least one pilot resource comprises a first pilot resource from the serving cell, and the first pilot resource is received in a different symbol than a second pilot resource from the neighbor cell. ### Claim 22 An apparatus for wireless communication of a base station, comprising: a memory; and at least one processor coupled to the memory and configured to: receive at least one pilot resource and at least one data resource from a user equipment (UE); identify interference cleaning data for the at least one pilot resource; determine whether a first interference affecting the at least one pilot resource is a same interference as a second interference affecting the at least one data resource based on identifying a transmission power difference between the at least one pilot resource and the at least one data resource; apply the interference cleaning data to the at least one data resource when the first interference is the same interference as the second interference, the interference cleaning data being applied to the at least one data resource when the transmission power difference is less than a threshold power; and apply modified interference cleaning data to the at least one data resource when the first interference is different than the second interference, the modified interference cleaning data being applied to the at least one data resource when the transmission power difference is greater than the threshold power. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein the interference cleaning data is a whitening transform matrix. ### Claim 24 (depends on 22) The apparatus of claim 22, wherein the modified interference cleaning data comprises a diagonal matrix, and the modified interference cleaning data is identified by nulling off-diagonal elements of a noise covariance matrix from which the interference cleaning data is identified, the noise covariance matrix being estimated from the at least one pilot resource. ### Claim 25 (depends on 22) The apparatus of claim 22, wherein the at least one pilot resource comprises a demodulation reference signal (DMRS). ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the modified interference cleaning data comprises a matrix resulting from an inverse of Rdiagnn wherein Rdiagnn is a result of zeroing off-diagonal elements of a Rnn matrix; and wherein the Rnn matrix is a noise covariance matrix estimated from the DMRS.