# US 2019/0356381 A1 · Reconfigurable and modular active repeater device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0356381 A1 - Document ID: US20190356381A1 - Status: Published application - Kind: A1 - Application number: 16/526,544 - Filed: 2019-07-30 - Published: 2019-11-21 - Earliest claimed: 2017-07-11 - Assignees: Movandi Corporation - Applicants: Movandi Corporation - Inventors: Sam GHARAVI; Ahmadreza ROFOUGARAN; Michael BOERS; Seunghwan YOON; Kartik SRIDHARAN; Donghyup SHIN; Farid SHIRINFAR; Stephen WU; Maryam ROFOUGARAN - Web page: https://patentgrep.com/patent/US20190356381A1 ## CPC - H04B 7/15514: {for shadowing compensation (for satellite mobile telephony service systems H04B7/18536)} - H04B 7/15528: {Control of operation parameters of a relay station to exploit the physical medium} - H04B 7/0413: MIMO systems - H04B 7/0617: {for beam forming} - H04B 7/15: Active relay systems - H04B 7/1555: {Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations} - H04B 7/165: employing angle modulation - H04B 7/2041: {Spot beam multiple access} - H04B 17/318: Received signal strength - H04W 52/245: {taking into account received signal strength} - H04W 52/46: in multi-hop networks, e.g. wireless relay networks - H04L 5/0023: {Time-frequency-space} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - 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) ## Abstract An active repeater device includes a primary sector and one or more secondary sectors, receives a first beam of input RF signals. A first set of analog baseband signals, are generated based on received first beam of input RF signals. The first set of analog baseband signals are converted to a first set of coded data signals and control information is extracted from the first set of coded data signals by decoding only a header portion of the first set of coded data signals without demodulation of data portion of the first set of coded data signals. Based on the extracted control information, the first set of coded data signals are transmitted as beams of output RF signals to remote user equipment. The transmission is independent of demodulation of the data portion within the active repeater device to reduce latency for transmission of the first set of coded data signals. ## Claims ### Claim 1 An active repeater device, comprising: a primary sector and at least one secondary sector, wherein the primary sector includes a baseband signal processor and a first radio head (RH) unit, and wherein the at least one secondary sector is communicatively coupled to the primary sector and includes a second RH unit, wherein the baseband signal processor comprises a digital signal processor that is configured to: store, in a buffer memory, a first digital baseband signal that comprises at least a training sequence signal, wherein the first digital baseband signal is transmitted as a beam of radio frequency (RF) signals; receive a second digital baseband signal that comprises the first digital baseband signal and a digital echo signal, wherein the digital echo signal corresponds to a reflection of RF signals previously transmitted by at least the first RH unit or the second RH unit; estimate a plurality of filter taps of a finite impulse response (FIR) filter in the baseband signal processor, based on the received second digital baseband signal and the first digital baseband signal; estimate the digital echo signal in the received second digital baseband signal based on the first digital baseband signal and the plurality of filter taps of the FIR filter; and remove the estimated digital echo signal from at least one current digital baseband signal, wherein the at least one current digital baseband signal is received as the RF signals via at least the first RH unit or the second RH unit. ### Claim 2 (depends on 1) The active repeater device according to claim 1, wherein the training sequence signal is a reference signal that is uncorrelated with the at least one current digital baseband signal. ### Claim 3 (depends on 1) The active repeater device according to claim 1, the digital signal processor is further configured to select an online mode, an offline mode, or a combination of the online mode and the offline mode for the estimation and the removal of the digital echo signal from the at least one current digital baseband signal. ### Claim 4 (depends on 3) The active repeater device according to claim 3, wherein the selection of the online mode, the offline mode, or the combination of the online mode and the offline mode is based on a signal quality of the at least one current digital baseband signal, and wherein the signal quality corresponds to an echo path response that depends on a size of the digital echo signal. ### Claim 5 (depends on 3) The active repeater device according to claim 3, wherein the digital signal processor is configured, in the offline mode, to: inject, the training sequence signal as the first digital baseband signal into a multiplexer in the baseband signal processor; transmit, by at least the first RH unit or the second RH unit, the training sequence signal as the beam of RF signals; and disable a path of the at least one current digital baseband signal to the multiplexer. ### Claim 6 (depends on 3) The active repeater device according to claim 3, wherein the digital signal processor is configured, in the online mode, to: enable a path of the at least one current digital baseband signal to a multiplexer in the baseband signal processor; and inject the training sequence signal and the at least one current digital baseband signal as the first digital baseband signal into the multiplexer; transmit, by at least the first RH unit or the second RH unit, the training sequence signal and the at least one current digital baseband signal as the beam of RF signals. ### Claim 7 (depends on 1) The active repeater device according to claim 1, wherein the plurality of filter taps are estimated based on a least mean square (LMS) technique or a least squares (LS) technique. ### Claim 8 (depends on 1) The active repeater device according to claim 1, wherein the digital signal processor is further configured to: preset a value of the plurality of filter taps of the FIR filter, based on first estimation of a first echo signal path in a test environment; and update the value of the plurality of filter taps based on a change in second estimation of a second echo signal path in a real environment. ### Claim 9 (depends on 1) The active repeater device according to claim 1, further comprising a Received Signal Strength Indicator (RSSI) circuitry in the primary sector configured to measure RSSI of each input RF signal received from one or more remote user equipments (UEs) in digital domain, wherein an accuracy of the measurement of the RSSI in the digital domain is increased based on suppression of adjacent channel signals in the digital domain. ### Claim 10 (depends on 1) The active repeater device according to claim 1, wherein digital signal processor is further configured to down convert the RF signal with a first frequency to an analog baseband (IQ) signal with a second frequency, and wherein the estimated digital echo signal is removed from at least one current digital baseband signal based on the down conversion of the RF signal with the first frequency. ### Claim 11 A method, comprising: in an active repeater device comprising a primary sector and at least one secondary sector, wherein the primary sector includes a baseband signal processor and a first radio head (RH) unit, wherein the at least one secondary sector is communicatively coupled to the primary sector and includes a second RH unit, and wherein the baseband signal processor comprises a digital signal processor: storing, in a buffer memory, a first digital baseband signal that comprises at least a training sequence signal, wherein the first digital baseband signal is transmitted as a beam of radio frequency (RF) signals; receiving, by the digital signal processor, a second digital baseband signal that comprises the first digital baseband signal and a digital echo signal, wherein the digital echo signal corresponds to a reflection of RF signals previously transmitted by at least the first RH unit or the second RH unit; estimating, by the digital signal processor, a plurality of filter taps of a finite impulse response (FIR) filter in the baseband signal processor, based on the received second digital baseband signal and the first digital baseband signal; estimating, by the digital signal processor, the digital echo signal in the received second digital baseband signal based on the first digital baseband signal and the plurality of filter taps of the FIR filter; and removing, by the digital signal processor, the estimated digital echo signal from at least one current digital baseband signal, wherein the at least one current digital baseband signal is received as the RF signals via at least the first RH unit or the second RH unit. ### Claim 12 (depends on 11) The method according to claim 11, wherein the training sequence signal is a reference signal that is uncorrelated with the at least one current digital baseband signal. ### Claim 13 (depends on 11) The method according to claim 11, the digital signal processor is further configured to select an online mode, an offline mode, or a combination of the online mode and the offline mode for the estimation and the removal of the digital echo signal from the at least one current digital baseband signal. ### Claim 14 (depends on 13) The method according to claim 13, wherein the selection of the online mode, the offline mode, or the combination of the online mode and the offline mode is based on a signal quality of the at least one current digital baseband signal, and wherein the signal quality corresponds to an echo path response that depends on a size of the digital echo signal. ### Claim 15 (depends on 13) The method according to claim 13, wherein the digital signal processor is configured, in the offline mode, to: inject the training sequence signal as the first digital baseband signal into a multiplexer in the baseband signal processor; transmit, by at least the first RH unit or the second RH unit, the training sequence signal as the beam of RF signals; and disable a path of the at least one current digital baseband signal to the multiplexer. ### Claim 16 (depends on 13) The method according to claim 13, wherein the digital signal processor is configured, in the online mode, to: enable a path of the at least one current digital baseband signal to a multiplexer in the baseband signal processor; and inject, the training sequence signal and the at least one current digital baseband signal as the first digital baseband signal into the multiplexer; transmit, by at least the first RH unit or the second RH unit, the training sequence signal and the at least one current digital baseband signal as the beam of RF signals. ### Claim 17 (depends on 11) The method according to claim 11, wherein the plurality of filter taps are estimated based on a least mean square (LMS) technique or a least squares (LS) technique. ### Claim 18 (depends on 11) The method according to claim 11, wherein the digital signal processor is further configured to: preset a value of the plurality of filter taps of the FIR filter, based on first estimation of a first echo signal path in a test environment; and update the value of the plurality of filter taps based on a change in second estimation of a second echo signal path in a real environment. ### Claim 19 (depends on 11) The method according to claim 11, further comprising a Received Signal Strength Indicator (RSSI) circuitry in the primary sector configured to measure RSSI of each input RF signal received from one or more remote user equipments (UEs) in digital domain, wherein an accuracy of the measurement of the RSSI in the digital domain is increased based on suppression of adjacent channel signals in the digital domain. ### Claim 20 (depends on 11) The method according to claim 11, wherein digital signal processor is further configured to down convert the RF signal with a first frequency to an analog baseband (IQ) signal with a second frequency, and wherein the estimated digital echo signal is removed from at least one current digital baseband signal based on the down conversion of the RF signal with the first frequency.