Research On Performance Of Spatial Fading Channel System Based On Massive MIMO Array

In recent years,with the development of mobile communication equipment and Internet information services,the commercialization of the fifth generation mobile communication system(5G)will land in the next two years.Previous multiple input multiple output antenna technology was not sufficient to support the future demand.Massive MIMO is one of the core technologies of 5G.It is mainly equipped with hundreds or thousands of antennas at the transmitting and receiving terminals,which can greatly improve the channel capacity and transmission rate.This paper mainly analyzes the angular energy space shape of Massive MIMO and analyzes the antenna array preparation scheme.It studies the extreme case of system channel failure under spatial selection fading correlation and Rice fading.The approximation algorithm is used to analyze the fading channel model.By changing the power allocation and the number of base station antennas to effectively improve the spectral efficiency of the array.This article is divided into the following four aspects:Firstly,the single antenna array elements of the MIMO array are subjected to mathematical characterization of the signal correlation factors,and the spatial fading correlation of two adjacent array elements is derived.Analyze the expression of the Gaussian distribution,Laplacian distribution and uniform distribution of the arrival signals power azimuth spectrum(PAS)under the spatial selective fading,simplified and approximated by mathematical methods.When the scatter is too complicated to cause multiple combinations of multiple clusters,the specific case is further analyzed,and the general formula of the fading correlation of the received signals in these cases is derived.Comparing the computational efficiency of the approximate simulation method and the original scheme,and providing an effective scheme for optimizing the overall channel performance by changing the distance between the array elements and combining the arrival angle combination clusters PAS.Secondly,according to the demands of future 5G development,the necessity of large-scale antenna array is proposed.The important objectives of large-scale antennas and various stages of research progress are introduced.The important objectives of large-scale antennas and various stages of research progress are introduced.Some of the more commonly used large-scale array forms are built by stacking multiple stacks.In order to improve the efficiency of the large-scale MIMO spatial fading algorithm,the planar direction of arrival(DOA)signal model of Massive MIMO is established in the outdoor spatial domain scattering environment,and the important parameters of the fading signal between the array elements can be calculated.Based on the uniform linear(ULA)and uniform circular array(UCA)of Massive MIMO in the general signal propagation environment,the closed expression of the fading correlation under the power azimuth spectrum of each array is derived,and the statistical channel related information is analyzed.The capacity expression under the array is compared with the optimal structure configuration scheme.The numerical simulation results are in good agreement with the actual channel test,and provide an effective means for the Massive MIMO receiving array configuration scheme for multipath propagation in multiple environments.Lastly,we introduced the multi-antennas and the important target directions of the phase research process.It builds some commonly used large-scale array forms through the stacking of multiple stacks.The extreme cases that cause Massive MIMO to fail in Rice fading in a specific scenario are discussed,mainly occurring between Line of Sight(LOS)vectors or the non-disappearing alignment between the covariance matrix and the LOS vector.By discarding highly correlated users in the same cell,these performance failure conditions can be effectively compensated.The traversal channel capacity of Massive MIMO for different Signal to Noise Ratio(SNR)levels is analyzed under the 5G oversized architecture based on Massive MIMO.Using the method of reducing power allocation and increasing the number of antennas,the spectrum efficiency is effectively improved,and some baseunit-based antenna unit cell designs are proposed.Simulated evaluation of scattering parameters and correlation coefficient diversity performance enables Massive MIMO systems to work more efficiently in future communication environments.