| 摘要 |
<p>The invention proposes a technical scheme (called as explicit feedback) used for feeding the information of downlink channels back to the base station in the user terminals of wireless communication system, and a technical scheme for precoding the data transmitted to the user terminals according to the information of downlink channels fed back by the user terminals in the base station. The user terminal determines an approximately equivalent matrix of the transmission matrix of downlink channel, according to the transmission matrix of downlink channel, the number of downlink data streams, the space correlation matrixes of multiple transmitting antennas in the base station and a predetermined codebook; then feeds the related information of the approximately equivalent matrix back to the base station. The base station recovers the approximately equivalent matrix according to the related information of the approximately equivalent matrix fed back from the user terminal, and precodes the downlink data transmitted to the user terminal by using the approximately equivalent matrix.</p> |
