US 11,754,658 B2
Radio station for client localization in multipath indoor environment
Alexander Kobzantsev, Hod Hasharon (IL); Doron Ezri, Hod Hasharon (IL); Avi Weitzman, Hod Hasharon (IL); Chun Pan, Nanjing (CN); Xingfeng Jiang, Nanjing (CN); and Jie Fu, Nanjing (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Feb. 21, 2022, as Appl. No. 17/651,856.
Application 17/651,856 is a continuation of application No. PCT/EP2019/072534, filed on Aug. 22, 2019.
Prior Publication US 2022/0196778 A1, Jun. 23, 2022
Int. Cl. G01S 3/48 (2006.01); G01S 3/74 (2006.01); H01Q 3/30 (2006.01)
CPC G01S 3/48 (2013.01) [G01S 3/74 (2013.01); H01Q 3/30 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An access point, comprising:
a circular antenna array comprising circularly and uniformly arranged antenna elements, wherein a first steering vector associated with the circular antenna array represents relative phases of the antenna elements of the circular antenna array, the relative phases of the antenna elements of the circular antenna array being relative to a reference point at an origin of the circular antenna array; and
a processor configured to:
receive first input data from the circular antenna array, wherein the first input data comprises channel state information;
transform the first input data into second input data using a transform that transforms the first steering vector of the circular antenna array into a second steering vector of a first virtual linear antenna array, wherein the first virtual linear array comprises uniformly and linearly arranged virtual antenna elements, wherein the second steering vector of the first virtual linear antenna array represents relative phases of the linearly arranged virtual antenna elements, the relative phases of the linearly arranged virtual antenna elements being relative to a reference antenna; and
transform the second input data into third input data using a transform that transforms the second steering vector of the virtual linear antenna array into a third steering vector of a second virtual linear antenna array, the second virtual linear array comprising a larger number of virtual antenna elements than the first virtual linear antenna array, and wherein the third steering vector of the second virtual antenna array is a function of angle of arrival and a time of flight; and
determine an angle of arrival of at least one path of a multipath indoor environment based on the third input data, by applying a two-dimensional multiple signal classification (MUSIC) algorithm over an angle of arrival and a time of flight domain over the third input data.