Three-dimensional wave beam forming method in long term evolution (LET)

Abstract

The invention discloses a three-dimensional wave beam forming method in long term evolution (LET). The three-dimensional wave beam forming method comprises the following steps that: a base station adopts an array antenna structure, and each antenna in the vertical direction has a port for wave beam forming; a terminal receives a signal, performs channel estimation to acquire a three-dimensional (3D) channel matrix H and selects a horizontal-dimension precoding matrix and a vertical-dimension precoding matrix according to the H; the terminal feeds sequence numbers corresponding to the precoding matrixes selected in the step 2 back to the base station, and the base station recovers the corresponding horizontal-dimension precoding matrix and the corresponding vertical-dimension precoding matrix according to the fed sequence numbers, and generates a 3D precoding matrix; and the base station precodes the sent signal according to the precoding matrix obtained in the step 3, performs 3D wave beam forming on the sent signal and sends the processed signal through the antenna, and the terminal receives the signal and returns to the step 2. By the method, channel information in the horizontal direction and the vertical direction are used comprehensively, and horizontal-dimension wave beam forming and vertical-dimension wave beam forming are realized at the same time, so higher wave beam forming gain can be obtained and the whole performance of the system can be improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a three-dimensional beamforming method in LTE (Long Term Evolution, long-term evolution). Background technique [0002] Beamforming technology is widely used in wireless communication systems. Its main task is to compensate for signal fading and distortion caused by factors such as space loss and multipath effects during wireless propagation, while reducing interference between co-channel users and improving system capacity. . Existing beamforming technology can only realize the movement of the beam following the target user in the horizontal direction by controlling the beamforming weights of the horizontal antenna elements, which can be regarded as tracking in two-dimensional space. The shaping weight in the vertical direction is a fixed value, that is, the beam in the vertical direction is fixed, so it is impossible to track the user in the vertical dir...

AI Technical Summary

Problems solved by technology

[0004] The solution of fixed downtilt angle can improve the throughput of the cell to a certain extent, but because this technology adopts the same downtilt angle for all users in the cell, the main lobe of the radiation pattern of the antenna can only be aligned with a certain one in the cell. direction, while the received power of other users deviating from the main lobe will be reduced, which will affect the service experience of these users

In addition, the method of providing fixed beams in the vertical direction makes it difficult to achieve beam scheduling and interference coordination between adjacent cells in the vertical direction, which brings obstacles to further reducing interference between adjacent cells

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