Precoding Algorithm Based On Interference Alignment MSV In Coordinated Multi-Point Transmission LTE-A System

Coordinated Multi-Point transmission(CoMP) is one of the candidate techniques for LTE-A systems to restrain inter-cell interference(ICI) effectively. Co MP makes full use of the characteristic of MIMO channel, and it uses the pre-coding technology to eliminate ICI, and it has a huge advantage in enhancing overall system performance.Interference Alignment(IA) technology aligns the interference signals through pre-coding at the transmitter, in order to make these interference signals to focus on a limited space, so as to achieve the aim of interference elimination. With 5G standard of air interface techniques proposed, Co MP technology still plays an important role to eliminate inter-cell interference in 5G communication system. Although this article does some researches and innovations of Co MP system and related technology in LTE-A systems in 4G, but it is also important in 5G system.First of all, this paper focuses on the Co MP technology based on the pattern of BBU + RRU, and introduces the classification and application of Co MP, and analyzes the network and system model of it in detail. Then this paper does the thorough research about interference alignment on the basis of the principle that pre-coding algorithm can eliminate ICI. After that, this paper continues introduces the principle and classification of the IA technology. Aim at the defects of the classical interference alignment technology which ignores the channel state information of user, this paper presents two kinds of the improved interference alignment pre-coding algorithm which are based on singular value decomposition(SVD) channel, and the pre-coding matrix of these two algorithms can be closer to the useful signal channel and be away from interference channel at the same time. Besides, this paper also analyzes its rationality theoretically. The signal sent by transmitter through the improved pre-coding arithmetic processing in this paper, and it will experience the most optimal channel transmitting information, which can largely improve the throughput of the system.Finally, this paper simulates the real scene of the multiple edge users in every community using Co MP-MU-MIMO system simulation model. This paper also makes the simulation about cell and channel model. In addition, this paper presents thesimulation about the modulation of user data, scheduling and receiving bite error rate.Depends on the overall system flow chart, we can calculate the average throughput of communication system.Through the simulation results the Co MP technology advantages can be seen clearly: enhance the cell user’s throughput, especially the throughput of edge users. In addition, the improved algorithm in this paper not only can improve the system whole throughput, but also can reduce the system error rate, and this improvement will have certain reference significance for interference study.