Study On Precoding Technology Based On Antenna Selection

With the advent of 5G technology,MIMO technology has been large-scale support 5G technology theory,but the development of large-scale MIMO technology has also brought the hardware cost increase,increasing the complexity of the pre encoding technology,increase the technical problems of pilot overhead etc..Precoding technology can effectively reduce the decoding complexity and reduce the interference between users,which has become one of the key technologies in wireless communication.Large scale MIMO technology can make the performance of the most simple linear pre encoding to achieve better results,in this case the user channel noise and interference can be considered completely eliminated,so in large scale MIMO in pre encoding technology advantage also brought some unavoidable defects,how to solve this problem is the focus of this paper.Antenna selection can reduce the overhead of RF link brought by large scale MIMO technology.The antenna selection is carried out to avoid a large number of matrix inversion operations caused by large scale MIMO system.It has become the bridge between the advantages and disadvantages of large scale MIMO and precoding technology.This paper is based on the study of the large scale MIMO precoding technology.In this paper,based on the brief introduction of CoMP system,a precoding model based on antenna selection is proposed,and then the large scale MIMO technology,antenna selection technology and precoding technology are briefly introduced.In the discussion of antenna selection technology proposes an antenna selection scheme based on the increment of channel capacity,different antenna and the maximum channel capacity is selected,each increase of one antenna is calculated and its contribution to the channel capacity of the whole system,if there is no contribution or contribution is less than the power consumption of the antenna delete.The experimental results show that the proposed scheme performance than the optimal antenna selection algorithm,increasing and decreasing antenna selection algorithm is slightly worse,but the computational complexity is greatly reduced;rather than norm based antenna selection algorithm and antenna correlation selection algorithm based on superior performance,computational complexity,and they are quite.It can get a compromise result in complexity and interrupt performance.Finally,according to the selection scheme of the proposed antenna,the antenna selection scheme based on precoding was studied.The experimental results show that the proposed scheme can reduce the independent precoding algorithm complexity and performance can be obtained in low signal-to-noise gain ratio,so the algorithm is more suitable for application in large scale MIMO system.