# US 12,192,040 B1 · Lattice reduction transformation matrix calculation and signaling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,040 B1 - Document ID: US12192040B1 - Status: Granted - Kind: B1 - Application number: 18/216,464 - Filed: 2023-06-29 - Published: 2025-01-02 - Granted: 2025-01-07 - Earliest claimed: 2023-06-29 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jacob Pick; Shay Landis; Peer Berger; Tomer Geva - Web page: https://patentgrep.com/patent/US12192040B1 ## CPC - H04L 27/26532: {Demodulators using other transforms, e.g. discrete cosine transforms, Orthogonal Time Frequency and Space [OTFS] or hermetic transforms} - H04L 25/0202: {Channel estimation} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Certain aspects of the present disclosure provide techniques for wireless communications by an apparatus. Certain techniques include sending an indication that the apparatus is capable of supporting lattice reduction (LR) demodulation; receiving a first LR transformation matrix (to be used for demodulating a modulated signal); and receiving the modulated signal. ## Claims ### Claim 1 An apparatus configured for wireless communications, comprising: one or more memories comprising processor-executable instructions; and one or more processors configured to execute the processor-executable instructions and cause the apparatus to: send an indication that the apparatus is capable of supporting lattice reduction (LR) demodulation; receive a modulated signal; and receive a first LR transformation matrix to be used for demodulating the modulated signal. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the one or more processors are configured to execute the processor-executable instructions and further cause the apparatus to: demodulate the modulated signal using the first LR transformation matrix. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein to send the indication that the apparatus is capable of supporting LR demodulation, the one or more processors are configured to execute the processor-executable instructions and cause the apparatus to: send the indication that the apparatus is capable of supporting LR demodulation prior to completing a radio resource control (RRC) connection with a network entity. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein, to receive the first LR transformation matrix, the one or more processors are configured to execute the processor-executable instructions and cause the apparatus to receive a first plurality of LR transformation matrices including the first LR transformation matrix, and wherein the one or more processors are configured to execute the processor-executable instructions and further cause the apparatus to: receive an indication of a corresponding frequency range over which to use each of the first plurality of LR transformation matrices for demodulation. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the indication of the corresponding frequency range over which to use each of the first plurality of LR transformation matrices for demodulation comprises an indication of a frequency granularity. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the apparatus receives the first plurality of LR transformation matrices concatenated together in order of corresponding frequency range. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the one or more processors are configured to execute the processor-executable instructions and further cause the apparatus to: receive a second LR transformation matrix after receiving the first LR transformation matrix; receive a second modulated signal after receiving the second LR transformation matrix; and demodulate the second modulated signal using the second LR transformation matrix. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the one or more processors are configured to execute the processor-executable instructions and further cause the apparatus to: after receiving the first LR transformation matrix, and before receiving the second LR transformation matrix, demodulate modulated signals, including the modulated signal, using the first LR transformation matrix; and after receiving the second LR transformation matrix, and before receiving a third LR transformation matrix, demodulate modulated signals, including the second modulated signal, using the second LR transformation matrix. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the apparatus comprises a user equipment (UE), and wherein the UE sends the indication to a network entity, receives the first LR transformation matrix from the network entity, and receives the modulated signal from the network entity. ### Claim 10 An apparatus configured for wireless communications, comprising: one or more memories comprising processor-executable instructions; and one or more processors configured to execute the processor-executable instructions and cause the apparatus to: receive an indication that a user equipment (UE) is capable of supporting lattice reduction (LR) demodulation; send a modulated signal; and send a first LR transformation matrix to be used for demodulating the modulated signal. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the one or more processors are configured to execute the processor-executable instructions and further cause the apparatus to: calculate the first LR transformation matrix based on a channel estimate between the UE and the apparatus. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the one or more processors are configured to execute the processor-executable instructions and further cause the apparatus to: receive a sounding reference signal (SRS); and determine the channel estimate based on the SRS. ### Claim 13 (depends on 10) The apparatus of claim 10, wherein to receive the indication that the UE is capable of supporting LR demodulation, the one or more processors are configured to execute the processor-executable instructions and cause the apparatus to: receive the indication that the UE is capable of supporting LR demodulation prior to completing a radio resource control (RRC) connection with the UE. ### Claim 14 (depends on 10) The apparatus of claim 10, wherein, to send the first LR transformation matrix, the one or more processors are configured to execute the processor-executable instructions and cause the apparatus to send a first plurality of LR transformation matrices including the first LR transformation matrix, and wherein the one or more processors are configured to execute the processor-executable instructions and further cause the apparatus to: send an indication of a corresponding frequency range over which to use each of the first plurality of LR transformation matrices for demodulation. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the indication of the corresponding frequency range over which to use each of the first plurality of LR transformation matrices for demodulation comprises an indication of a frequency granularity. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the apparatus sends the first plurality of LR transformation matrices concatenated together in order of corresponding frequency range. ### Claim 17 (depends on 10) The apparatus of claim 10, wherein the one or more processors are configured to execute the processor-executable instructions and further cause the apparatus to: send a second LR transformation matrix after sending the first LR transformation matrix; and send a second modulated signal after sending the second LR transformation matrix. ### Claim 18 (depends on 10) The apparatus of claim 10, wherein the apparatus comprises a network entity, and wherein the network entity receives the indication from the UE, sends the first LR transformation matrix to the UE, and sends the modulated signal to the UE. ### Claim 19 A method for wireless communications by an apparatus, the method comprising: sending an indication that the apparatus is capable of supporting lattice reduction (LR) demodulation; receiving a modulated signal; and receiving a first LR transformation matrix to be used for demodulating the modulated signal. ### Claim 20 (depends on 19) The method of claim 19, further comprising: demodulating the modulated signal using the first LR transformation matrix. ### Claim 21 (depends on 19) The method of claim 19, wherein sending the indication that the apparatus is capable of supporting LR demodulation comprises: sending the indication that the apparatus is capable of supporting LR demodulation prior to completing a radio resource control (RRC) connection with a network entity. ### Claim 22 (depends on 19) The method of claim 19, wherein receiving the first LR transformation matrix comprises receiving a first plurality of LR transformation matrices including the first LR transformation matrix; and wherein the method further comprises: receiving an indication of a corresponding frequency range over which to use each of the first plurality of LR transformation matrices for demodulation. ### Claim 23 (depends on 19) The method of claim 19, further comprising: receiving a second LR transformation matrix after receiving the first LR transformation matrix; receiving a second modulated signal after receiving the second LR transformation matrix; and demodulating the second modulated signal using the second LR transformation matrix. ### Claim 24 (depends on 19) The method of claim 19, wherein the apparatus comprises a UE, and wherein the UE sends the indication to a network entity, receives the first LR transformation matrix from the network entity, and receives the modulated signal from the network entity. ### Claim 25 A method for wireless communications by an apparatus, the method comprising: receiving an indication that a user equipment (UE) is capable of supporting lattice reduction (LR) demodulation; sending a modulated signal; and sending a first LR transformation matrix to be used for demodulating the modulated signal. ### Claim 26 (depends on 25) The method of claim 25, further comprising: calculating the first LR transformation matrix based on a channel estimate between the UE and the apparatus. ### Claim 27 (depends on 25) The method of claim 25, wherein receiving the indication that the UE is capable of supporting LR demodulation comprises: receiving the indication that the UE is capable of supporting LR demodulation prior to completing a radio resource control (RRC) connection with the UE. ### Claim 28 (depends on 25) The method of claim 25, wherein sending the first LR transformation matrix comprises sending a first plurality of LR transformation matrices including the first LR transformation matrix; and wherein the method further comprises: sending an indication of a corresponding frequency range over which to use each of the first plurality of LR transformation matrices for demodulation. ### Claim 29 (depends on 25) The method of claim 25, further comprising: sending a second LR transformation matrix after sending the first LR transformation matrix; and sending a second modulated signal after sending the second LR transformation matrix. ### Claim 30 (depends on 25) The method of claim 25, wherein the apparatus comprises a network entity, and wherein the network entity receives the indication from the UE, sends the first LR transformation matrix to the UE, and sends the modulated signal to the UE.