The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 2009
Filed:
Jan. 05, 2006
Pang-an Ting, Fongyuan, TW;
Chao-kai Wen, Taipei, TW;
Wei-ping Chuang, Kaohsiung, TW;
Jiunn-tsair Chen, Hsinchu, TW;
Pang-An Ting, Fongyuan, TW;
Chao-Kai Wen, Taipei, TW;
Wei-Ping Chuang, Kaohsiung, TW;
Jiunn-Tsair Chen, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
The present invention provides an antenna-array-based multiple-input multiple-output orthogonal-frequency-division-multiplexing (MIMO-OFDM) system and a pre-coding and feedback method used in the same. The present invention uses QR decompositions of the MIMO channel matrixes to parameterize the channel state information (CSI) of every OFDM frequency band. In addition, the present invention feeds back the information related to θ and φ in the Givens rotation matrixes of the partial frequency bands and then uses an interpolation method to generate θ and φ in the Givens rotation matrixes of all the frequency bands, which further is able to represent the CSI of all the frequency bands. In this way, the present invention has advantages of low complexity and low feedback rate requirement.