The Research Of Inter Cell Interference Suppression Based On Coordinated Multi-Point Technology

In today's global wireless communication showing a trend of rapid development of mobile and broadband,3GPP proposed the 4G standard-long-term evolution(LTE),enhanced long-term evolution(LTE-A)based on its development.LTE-A adopted orthogonal frequency division multiple access(OFDMA)on the basis of technology can avoid the interference problem of users in the cell.In order to obtain the high coverage rate of the cell,it was often used the same frequency networking in the actual situation,while the cell would suffer severe interference,therefore,the problem of eliminating the inter cell interference becomed the urgent need of LTE-A.Multi point Cooperation(CoMP)was one of the key technologies in LTE-A system,which can mitigate the interference by combining the features of multi-user cooperative MIMO channel and precoding technology.Because of its significant advantages in improving the performance of the system,multi point cooperative technology had been widely concerned by the academic community.This paper focused on the research of interference suppression techniques.First the main characteristics of LTE-A system was introduced,and then the classification principle and principle of knowledge of traditional inter cell interference suppression technology were analyzed,through comparison of the advantages and disadvantages of the interference suppression technology,then lead to the core of the article-multi-point collaboration technology.Precoding processing and Resource allocation of cooperative scheduling were effective ways to suppress interference in multi point cooperative technology,the research focus of this paper was the precoding processing.Then a detailed analysis of the technical index of Co MP with the transmission scheme and system coordination model,the traditional algorithm of precoding principle of linear precoding technology was briefly introduced,which introduced the linear precoding scheme in multi point cooperative technology,the performance difference between the zero forcing algorithm,minimum mean square error algorithm,block diagonalization algorithm and the signal to noise ratioalgorithm were analyzed and compared.Finally,in view of the shortcomings of the above algorithms,an improved algorithm of zero forcing criterion with the signal to noise ratio algorithm and minimum mean square error algorithm combined with block diagonalization optimization algorithm were improved,after the simulation results make clear that the improved algorithm was better than the traditional precoding algorithm in error rate and system capacity.