# US 9,753,118 B2 · Technique for obtaining the rotation of a wireless device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,753,118 B2 - Document ID: US9753118B2 - Status: Granted - Kind: B2 - Application number: 14/919,389 - Filed: 2015-10-21 - Published: 2016-05-26 - Granted: 2017-09-05 - Earliest claimed: 2014-11-25 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Amichai Sanderovich; Iddo Diukman - Web page: https://patentgrep.com/patent/US9753118B2 ## CPC - G01S 5/0289: {of multiple transceivers, e.g. in ad hoc networks} - H04B 7/002: {Reducing depolarization effects} - H04B 7/10: Polarisation diversity; Directional diversity - H04B 7/088: {using beam selection} - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H04B: TRANSMISSION ## Abstract Certain aspects of the present disclosure relate to methods and apparatus for wireless communication. More particularly, aspects of the present disclosure generally relate to techniques for wireless communications by a first apparatus comprising a first interface for obtaining, via at least one receive antenna, first and second training signals transmitted from a second apparatus via at least first and second transmit antennas having different polarizations, and a processing system configured to determine, based on the first and second training signals, one or more characteristics for different transmit-receive antenna pairs, each pair comprising one of the first and second transmit antennas and the at least one receive antenna, and generate, based on the one or more characteristics, a parameter indicative of a rotation of the first apparatus relative to the second apparatus. ## Claims ### Claim 1 A first apparatus for wireless communications, comprising: a first interface for obtaining, via at least one receive antenna, first and second training signals transmitted from a second apparatus via at least first and second transmit antennas having different polarizations; and a processing system configured to: determine, based on the first and second training signals, one or more characteristics for different transmit-receive antenna pairs, each pair comprising one of the first and second transmit antennas and the at least one receive antenna, generate, based on the one or more characteristics, a parameter indicative of a rotation of the first apparatus relative to the second apparatus, and adjust the parameter based on the one or more characteristics. ### Claim 2 (depends on 1) The first apparatus of claim 1, further comprising a second interface for at least one of: outputting the parameter for transmission to the second apparatus; or outputting the parameter for use in an application running on the first apparatus. ### Claim 3 (depends on 1) The first apparatus of claim 1, wherein: the different polarizations of the first and second transmit antennas correspond to horizontal and vertical polarizations. ### Claim 4 (depends on 1) The first apparatus of claim 1, wherein the at least one receive antenna comprises at least one vertically polarized receive antenna and at least one horizontally polarized receive antenna. ### Claim 5 (depends on 1) The first apparatus of claim 1, wherein the one or more characteristics comprise receive powers associated with the first and second training signals. ### Claim 6 (depends on 5) The first apparatus of claim 5, wherein the parameter is generated based on a trigonometric function applied to a ratio of the receive powers associated with the first and second training signals. ### Claim 7 (depends on 1) The first apparatus of claim 1, wherein the one or more characteristics comprise receive phases associated with the first and second training signals. ### Claim 8 (depends on 7) The first apparatus of claim 7, wherein the processing system is further configured to adjust the parameter by 180 degrees, based on the receive phase associated with the first and second training signals. ### Claim 9 (depends on 1) The first apparatus of claim 1, wherein the first and second training signals are obtained as a part of a beamforming training procedure. ### Claim 10 A method for wireless communications, comprising: obtaining, by a first apparatus, via at least one receive antenna, first and second training signals transmitted from a second apparatus via at least first and second transmit antennas having different polarizations; determining, based on the first and second training signals, one or more characteristics for different transmit-receive antenna pairs, each pair comprising one of the first and second transmit antennas and the at least one receive antenna; generating, based on the one or more characteristics, a parameter indicative of a rotation of the first apparatus relative to the second apparatus; and adjusting the parameter based on the one or more characteristics. ### Claim 11 (depends on 10) The method of claim 10, further comprising at least one of: outputting the parameter for transmission to the second apparatus; or outputting the parameter for use in an application running on the first apparatus. ### Claim 12 (depends on 10) The method of claim 10, wherein: the different polarizations of the first and second transmit antennas correspond to horizontal and vertical polarizations. ### Claim 13 (depends on 10) The method of claim 10, wherein the at least one receive antenna comprises at least one vertically polarized receive antenna and at least one horizontally polarized receive antenna. ### Claim 14 (depends on 10) The method of claim 10, wherein the one or more characteristics comprise receive powers associated with the first and second training signals. ### Claim 15 (depends on 14) The method of claim 14, wherein the parameter is generated based on a trigonometric function applied to a ratio of the receive powers associated with the first and second training signals. ### Claim 16 (depends on 10) The method of claim 10, wherein the one or more characteristics comprise receive phases associated with the first and second training signals. ### Claim 17 (depends on 16) The method of claim 16, wherein the processing system is further configured to adjust the parameter by 180 degrees, based on the receive phase associated with the first and second training signals. ### Claim 18 (depends on 10) The method of claim 10, wherein the first and second training signals are obtained as a part of a beamforming training procedure. ### Claim 19 An apparatus for wireless communications, comprising: means for obtaining, by a first apparatus, via at least one receive antenna, first and second training signals transmitted from a second apparatus via at least first and second transmit antennas having different polarizations; means for determining, based on the first and second training signals, one or more characteristics for different transmit-receive antenna pairs, each pair comprising one of the first or second transmit antennas and the at least one receive antenna; means for generating, based on the one or more characteristics, a parameter indicative of a rotation of the first apparatus relative to the second apparatus; and means for adjusting the parameter based on the one or more characteristics. ### Claim 20 (depends on 19) The apparatus of claim 19, further comprising at least one of: means for outputting the parameter for transmission to the second apparatus; or means for outputting the parameter for use in an application running on the first apparatus. ### Claim 21 (depends on 19) The apparatus of claim 19, wherein: the different polarizations of the first and second transmit antennas correspond to horizontal and vertical polarizations. ### Claim 22 (depends on 19) The apparatus of claim 19, wherein the at least one receive antenna comprises at least one vertically polarized receive antenna and at least one horizontally polarized receive antenna. ### Claim 23 (depends on 19) The apparatus of claim 19, wherein the one or more characteristics comprise receive powers associated with the first and second training signals. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the parameter is generated based on a trigonometric function applied to a ratio of the receive powers associated with the first and second training signals. ### Claim 25 (depends on 19) The apparatus of claim 19, wherein the one or more characteristics comprise receive phases associated with the first and second training signals. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the processing system is further configured to adjust the parameter by 180 degrees, based on the receive phase associated with the first and second training signals. ### Claim 27 (depends on 19) The apparatus of claim 19, wherein the first and second training signals are obtained as a part of a beamforming training procedure. ### Claim 28 A non-transitory computer readable storage medium having instructions stored thereon for: obtaining, by a first apparatus, via at least one receive antenna, first and second training signals transmitted from a second apparatus via at least first and second transmit antennas having different polarizations; determining, based on the first and second training signals, one or more characteristics for different transmit-receive antenna pairs, each pair comprising one of the first and second transmit antennas and the at least one receive antenna; generating, based on the one or more characteristics, a parameter indicative of a rotation of the first apparatus relative to the second apparatus; and adjusting the parameter based on the one or more characteristics. ### Claim 29 A wireless station, comprising: a receiver for receiving first and second training signals transmitted from a second apparatus via at least first and second transmit antennas having different polarizations; and a processing system configured to: determine, based on the first and second training signals, one or more characteristics for different transmit-receive antenna pairs, each pair comprising one of the first and second transmit antennas and the at least one receive antenna, generate, based on the one or more characteristics, a parameter indicative of a rotation of the first apparatus relative to the second apparatus, and adjust the parameter based on the one or more characteristics.