Muncy, Geissler, Olds & Lowe, P.C.
Multi-antenna system and precoding method thereof
A precoding method in a multi-antenna system includes the following steps. A reference device transmits a first reference signal to base station antennas. A base station calculates uplink channel information and transmits it to a coordination server. The base station transmits a second reference signal to the reference device. The reference device calculates downlink channel information and transmits it to the coordination server. The coordination server performs the following steps: calculate carrier frequency offsets (CFO) between base stations according to the uplink channel information; calculate channel calibration coefficients according to the CFO, the uplink channel information, and the downlink channel information; calculate a first downlink channel at a first time point according to a user equipment's first uplink channel and the channel calibration coefficients; use a prediction function to predict a second downlink channel at a second time point; generate a precoder according to the second downlink channel.
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
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Jia-Ming Jen-Yuan Ming-Che Jiun-You
Chen Hsu Lin Lai