Wireless communication method, base station and terminal

Abstract

The invention discloses a wireless communication method. The method comprises the following steps that a base station obtains a common pilot sequence, utilizes a pilot weighting matrix to carry out weighting on a common pilot symbol in the common pilot sequence on a pilot sub-frame in order to obtain a target pilot symbol and sends the target pilot symbol to a terminal; the terminal computes according to the target pilot symbol in order to obtain channel information and feeds the channel information back to the base station; the base station determines a channel shaping matrix according to the channel information and the pilot weighting matrix, carries out weighting on a data symbol according to the channel shaping matrix in order to obtain a downlink transmission data symbol and obtains a first precoding matrix indication; the base station sends the downlink transmission data symbol and the first precoding matrix indication to the terminal; and the terminal utilizes the first precoding matrix indication to demodulate the downlink transmission data symbol. The invention also provides the base station and the terminal, which are capable of realizing the wireless communication method. According to the wireless communication method, the base station and the terminal, the pilot cost can be reduced and the beam forming precision of the downlink data can be improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a wireless communication method, a base station and a terminal. Background technique [0002] With the development of communication technologies, a Long Term Evolution (LTE for short) system introduces a Multiple-Input Multiple-Output (Multiple-Input Multiple-Output, MIMO for short) technology. MIMO technology refers to the communication technology that uses multiple transmitting antennas and receiving antennas at the transmitting end and receiving end respectively, so that signals are transmitted and received through multiple antennas at the transmitting end and receiving end, which can make full use of space resources without increasing spectrum resources and In the case of low antenna power, the notification channel capacity can be doubled and the communication quality can be improved. [0003] In a multi-antenna communication system using Frequency Division Duplexing (FDD f...

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Problems solved by technology

[0004] In order to obtain antenna gain, eNB usually uses multiple transmit antennas to send pilot symbols, a large number of pilot symbols cause a large pilot overhead

At the same time, when the eNB selects the precoding matrix according to the PMI, due to the limited number of precoding matrices defined by the existing wireless communication protocol, there is often a significant error between the above precoding matrix and the main eigenvector of the real channel, and the quantization accuracy is low.

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