Precoding matrix index reporting and precoding processing method, system and apparatus thereof

Abstract

The embodiment of the invention discloses a precoding matrix index reporting and precoding processing method, a system and an apparatus thereof and relates to the wireless communication technology field. The method, the system and the apparatus are used to save resource costs occupied by a terminal which reports the precoding matrix. The method is characterized in that: the terminal determines an antenna port number and a precoding matrix index table corresponding to a rank indication (RI) value; the terminal acquires a mapping relation between a compressed code word index and an original code word index and selects precoding matrixes corresponding to the original code word index which is mapped by the compressed code word index to be the current available precoding matrixes; one precoding matrix is selected from the current available precoding matrixes and the compressed code word index corresponding to the precoding matrix is determined; the compressed code word index is reported to a base station, wherein a bit number used by the reporting is not greater than the bit number which can express the precoding matrixes corresponding to all the compressed code word indexes which are comprised by the mapping relation. By using the method, the system and the apparatus of the invention, the resource costs occupied by the terminal which reports the precoding matrixes can be saved.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a precoding matrix index reporting and precoding processing method, system and device. Background technique [0002] In a Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Output) system, if the transmitter can know the channel information in a certain way, it can optimize the transmitted signal according to the channel characteristics, thereby improving the receiving quality and reducing the complexity of the receiver. degree requirements. In practical systems, channel information is generally fed back in the form of quantized channel information to reduce feedback overhead and improve system transmission efficiency. [0003] A codebook-based implicit CSI (Channel State Information) feedback method is adopted in the Long Term Evolution (LTE) system. The terminal (UE) measures the downlink channel based on the pilot, and reports the number of data strea...

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Problems solved by technology

[0044] According to the above Table 3-Table 6, in the scenario of 8 antenna ports in the LTE-A system, if the RI is 1 or 2 or 3, the terminal needs to use at least 4 bits to report PMI2; if the RI is 4, the terminal needs at least Using 3 bits to report PMI2, the resource overhead occupied by the terminal to transmit PMI2 is relatively large

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