# US 11,909,455 B2 · Global equalizer self interference cancelation for hybrid MIMO systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,455 B2 - Document ID: US11909455B2 - Status: Granted - Kind: B2 - Application number: 17/818,692 - Filed: 2022-08-09 - Published: 2023-02-16 - Granted: 2024-02-20 - Earliest claimed: 2021-08-16 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Chance Tarver; Matthew Tonnemacher; Khurram Muhammad - Web page: https://patentgrep.com/patent/US11909455B2 ## CPC - H04B 17/101: {for measurement of specific parameters of the transmitter or components thereof} - H04B 7/0413: MIMO systems - H04B 17/191: {Over-the-air testing} - H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) - H04B 17/354: Adjacent channel leakage power - H04B 17/391: Modelling the propagation channel - H04L 25/03006: {Arrangements for removing intersymbol interference} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method includes transmitting, by a transceiver configured to concurrently transmit over multiple transmit paths and receive over multiple receive paths, one or more signals, the transceiver comprising multiple transmit antennas and multiple receive antennas. The method also includes, for at least one of the multiple receive antennas: receiving one or more feedback signals from one or more power amplifiers associated with the one or more transmitted signals; calculating one or more estimated self-interference (SI) signals based on the one or more feedback signals using an equalizer array comprising a predetermined channel model; and subtracting the one or more estimated SI signals from one or more receive signals received at the at least one receive antenna to obtain one or more residual signals. ## Claims ### Claim 1 A method comprising: transmitting, by a transceiver configured to concurrently transmit over multiple transmit paths and receive over multiple receive paths, one or more signals, the transceiver comprising multiple transmit antennas and multiple receive antennas; determining an equalizer array comprising a predetermined channel model; for at least one of the multiple receive antennas: receiving one or more feedback signals from one or more power amplifiers associated with the one or more transmitted signals; calculating one or more estimated self-interference (SI) signals based on the one or more feedback signals using the equalizer array; and subtracting the one or more estimated SI signals from one or more receive signals received at the at least one receive antenna to obtain one or more residual signals, wherein the equalizer array is determined by broadcasting second transmit signals on all of the multiple transmit antennas, and receiving (i) second feedback signals associated with the second transmit signals and (ii) second receive signals received by the multiple receive antennas. ### Claim 2 (depends on 1) The method of claim 1, wherein the one or more SI signals are configured to cancel SI caused by the one or more transmitted signals leaking into at least one of the multiple receive paths of the transceiver. ### Claim 3 (depends on 1) The method of claim 1, wherein the equalizer array is further determined by performing an estimation using the second feedback signals and the second receive signals to learn multiple equalizers comprising the equalizer array. ### Claim 4 (depends on 1) The method of claim 1, wherein: the transceiver is part of a hybrid multiple-input multiple-output (MIMO) system; and the multiple transmit paths are grouped into subarrays, each subarray associated with one radio frequency digital-to-analog converter (RFDAC), multiple analog phase shifters, and multiple power amplifiers. ### Claim 5 (depends on 4) The method of claim 4, wherein a channel between each transmit path and each receive path is determined based on information associated with one or more analog phase shifter values. ### Claim 6 (depends on 1) The method of claim 1, wherein an exact receive signal at each of the multiple receive antennas is unknown. ### Claim 7 (depends on 1) The method of claim 1, wherein the one or more feedback signals are received via one or more feedback paths, each feedback path comprising one or more of: at least one filter; a radio frequency analog-to-digital converter (RFADC); and a numerically controlled oscillator (NCO). ### Claim 8 A device comprising: a transceiver configured to concurrently transmit one or more signals over multiple transmit paths and receive one or more receive signals over multiple receive paths, the transceiver comprising multiple transmit antennas and multiple receive antennas; a processor operably connected to the transceiver, the processor configured to: determine an equalizer array comprising a predetermined channel model; and for at least one of the multiple receive antennas: receive one or more feedback signals from one or more power amplifiers associated with the one or more transmitted signals; calculate one or more estimated self-interference (SI) signals based on the one or more feedback signals using the equalizer array; and subtract the one or more estimated SI signals from the one or more receive signals to obtain one or more residual signals, wherein to determine the equalizer array, the processor is configured to broadcast second transmit signals on all of the multiple transmit antennas, and receive (i) second feedback signals associated with the second transmit signals and (ii) second receive signals received by the multiple receive antennas. ### Claim 9 (depends on 8) The device of claim 8, wherein the one or more SI signals are configured to cancel SI caused by the one or more transmitted signals leaking into at least one of the multiple receive paths of the transceiver. ### Claim 10 (depends on 8) The device of claim 8, wherein to determine the equalizer array, the processor is further configured to perform an estimation using the second feedback signals and the second receive signals to learn multiple equalizers comprising the equalizer array. ### Claim 11 (depends on 8) The device of claim 8, wherein: the device is part of a hybrid multiple-input multiple-output (MIMO) system; the transceiver further comprises multiple subarrays, each subarray comprising a radio frequency digital-to-analog converter (RFDAC), multiple analog phase shifters, and multiple power amplifiers; and the multiple transmit paths are grouped into the subarrays. ### Claim 12 (depends on 11) The device of claim 11, wherein a channel between each transmit path and each receive path is determined based on information associated with one or more analog phase shifter values. ### Claim 13 (depends on 8) The device of claim 8, wherein an exact receive signal at each of the multiple receive antennas is unknown. ### Claim 14 (depends on 8) The device of claim 8, wherein: the transceiver further comprises multiple feedback paths, each feedback path comprising one or more of: at least one filter, a radio frequency analog-to-digital converter (RFADC), and a numerically controlled oscillator (NCO); and the one or more feedback signals are received via one or more of the feedback paths. ### Claim 15 A non-transitory computer readable medium comprising program code that, when executed by a processor of a device, causes the device to: control a transceiver to transmit one or more signals, the transceiver configured to concurrently transmit over multiple transmit paths and receive over multiple receive paths, the transceiver comprising multiple transmit antennas and multiple receive antennas; determine an equalizer array comprising a predetermined channel model; and for at least one of the multiple receive antennas: receive one or more feedback signals from one or more power amplifiers associated with the one or more transmitted signals; calculate one or more estimated self-interference (SI) signals based on the one or more feedback signals using the equalizer array; and subtract the one or more estimated SI signals from one or more receive signals received at the at least one receive antenna to obtain one or more residual signals, wherein to determine the equalizer array, the program code causes the device to broadcast second transmit signals on all of the multiple transmit antennas, and receive (i) second feedback signals associated with the second transmit signals and (ii) second receive signals received by the multiple receive antennas. ### Claim 16 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the one or more SI signals are configured to cancel SI caused by the one or more transmitted signals leaking into at least one of the multiple receive paths of the transceiver. ### Claim 17 (depends on 15) The non-transitory computer readable medium of claim 15, wherein to determine the equalizer array, the program code further causes the device to perform a least squares estimation using the second feedback signals and the second receive signals to learn multiple equalizers comprising the equalizer array. ### Claim 18 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the device is part of a hybrid multiple-input multiple-output (MIMO) system. ### Claim 19 (depends on 18) The non-transitory computer readable medium of claim 18, wherein a channel between each transmit path and each receive path is determined based on information associated with one or more analog phase shifter values. ### Claim 20 (depends on 15) The non-transitory computer readable medium of claim 15, wherein the one or more feedback signals are received via one or more feedback paths, each feedback path comprising one or more of: at least one filter; a radio frequency analog-to-digital converter (RFADC); and a numerically controlled oscillator (NCO).