Communication method and base station using codebook in a wireless communication system

Abstract

The embodiment of the invention discloses a communication method and a base station using a codebook in a wireless communication system. The method in the embodiment of the present invention includes: determining the number of data streams to be sent; selecting a codebook according to the number of data streams to be sent, the codebook includes the phase difference between the antenna ports in the first antenna direction, and the antenna port in the second antenna direction The phase difference between the ports, and the phase difference between the antenna ports in the polarized antenna direction, or the codebook includes the phase difference between the antenna ports in the first antenna direction and the phase difference between the antenna ports in the second antenna direction ;Use the codebook to precode the data stream to be sent to obtain precoded data; send the precoded data through the antenna port of the antenna array, and use the phase difference between the first antenna direction and the second antenna direction The codebook performs precoding processing on the data stream, so that the spatial three-dimensional beam can be effectively realized, and the performance of the system can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a communication method and a base station using a codebook in a wireless communication system. Background technique [0002] With the continuous growth of various smartphone and multimedia wireless communication applications, the demand for wireless data rate growth is also increasing. In Long Term Evolution (English full name: Long Term Evolution, abbreviated as: LTE) and Long Term Advanced Evolution (English full name: Long Term Evolution-Advanced, abbreviated as: LTE-A), MIMO (English full name: Multiple-Input Multiple-Out-put, abbreviated as: MIMO) technology is one of the key technologies to improve system performance. [0003] In LTE-A, the base station can use 8 antenna ports to transmit data. Considering the codebook expansion characteristics, the 8-antenna port codebook design in LTE-A is based on the existing 4-antenna port design in LTE-A. Antenna port...

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Problems solved by technology

[0004] However, in the existing protocol, the 8-antenna port in LTE-A supports the precoding of 1 to 8 stream data to Figure 1b Take the polarized antenna in the example as an example. In the precoding method, the phase difference between the four antenna ports in the same array direction is considered, so that the antenna configuration can only be adjusted in one antenna direction (horizontal direction), and the spatial three-dimensional beam cannot be realized. , which limits the improvement of system performance

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