Multiplex communications – Communication over free space – Combining or distributing information via frequency channels
Reexamination Certificate
2006-01-05
2009-02-03
Ngo, Ricky (Department: 2416)
Multiplex communications
Communication over free space
Combining or distributing information via frequency channels
C370S329000, C370S295000, C375S347000
Reexamination Certificate
active
07486655
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.
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Chen Jiunn-Tsair
Chuang Wei-Ping
Ting Pang-An
Wen Chao-Kai
Industrial Technology Research Institute
J.C. Patents
Ngo Ricky
Samuel Dewanda
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