Title:
QUICK SEARCH METHOD
Document Type and Number:
WIPO Patent Application WO/2021/196726
Kind Code:
A1
Abstract:
The high complexity of calculating a spatial feature and searching for a rotation parameter is an obstacle of realizing a spatial rotation operation. The quick search method of the present application comprises: 1) a base station calculates the discrete Fourier transform of a kth user according to the uplink channel vector hk of the kth user, and determines the spatial feature (aa) of the kth user; 2) initialize N angle values, respectively calculate the discrete Fourier transform of the channel vector under N rotational angles, and according to the discrete Fourier transform, calculate sparse channel energy under N angles; 3) use the rotational angles as independent variables, and the sparse channel energy as a dependent variable, and perform polynomial fitting on the data of N points by using an m-order polynomial; 4) calculate the maximum value of the polynomial within an angle range as the rotational angle of the kth user, and according to the spatial feature of the kth user, obtain an optimal channel orthogonal spatial basis; 5) repeat steps 1)-3) for the remaining K-1 users, and update the optimal channel orthogonal spatial basis of each user within the current coherence time period. The design difficulty of an entire system is reduced.
Inventors:
DU QINGHE (CN)
OU YIJIE (CN)
SHEN NING (CN)
OU YIJIE (CN)
SHEN NING (CN)
Application Number:
PCT/CN2020/135753
Publication Date:
October 07, 2021
Filing Date:
December 11, 2020
Export Citation:
Assignee:
XIAN JIAO TONG UNIV (CN)
International Classes:
H04L25/02; H04B7/0413
Foreign References:
| CN111614386A | 2020-09-01 | |||
| CN110380994A | 2019-10-25 | |||
| CN110636018A | 2019-12-31 | |||
| CN110460549A | 2019-11-15 | |||
| US8416896B2 | 2013-04-09 |
Attorney, Agent or Firm:
BEIJING CHENGHUI LAW FIRM (CN)
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