Statistical information-based two-dimensional joint SDMA method in 3d MIMO system

Abstract

The invention discloses a double dimension joint SDMA method based on statistical information in a 3D MIMO system. The method includes the following steps of (1) channel estimation and correlation matrix calculation, (2) clustering base matrix configuring, (3) user clustering, (4) user characteristic direction selection, (5) user grouping and (6) downlink data sending. The double dimension joint SDMA method has the advantages that clustering bases designed through the double dimension joint SDMA method can jointly achieve horizontal user clustering and grouping and vertical user clustering and grouping, and the registration precision of users by a base station is greatly improved; by means of the method, only the sending end correlation matrixes corresponding to the users need to be fed back in a long term, and the channel state information does not need to be fed back quantitatively in real time, so that the load of an up link can be greatly relieved; the clustering and grouping method is adopted, the airspace freedom degree provided by multiple antennas of the base station can be utilized flexibly and efficiently, and thus the number of the users is increased; the method is simple in operation step and convenient to actually apply.

Description

technical field [0001] The invention relates to a two-dimensional joint SDMA method, in particular to a two-dimensional joint SDMA method based on statistical information in a 3D MIMO system, and belongs to the technical field of wireless communication. Background technique [0002] In order to meet the ever-increasing service quality requirements of users in the future, the research work of the fifth generation mobile communication technology is committed to achieving the goal of "1000 times in 10 years". 3D MIMO technology is expected to become a key technology to greatly improve system performance. Different from the traditional communication system that only considers channel information in the horizontal dimension, the 3D MIMO system can realize the utilization of the degree of freedom in the vertical dimension of the channel, thereby further increasing the average capacity of the system and improving the user capacity of edge cells. 3D MIMO technology requires the use...

AI Technical Summary

Problems solved by technology

3D MIMO technology requires the use of active antenna arrays in the base station, which dramatically increases the complexity and feedback of the system

The flexibility of this method is not high, and it cannot make full use of the spatial freedom of the base station’s large-scale antennas. Moreover, due to the large increase in the number of base station antennas, the amount of real-time feedback required also increases accordingly, which increases the load on the uplink and the amount of feedback. The contradiction between accuracy and accuracy makes it difficult to apply to practical scenarios

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