Interference Alignment Scheme Research In Uplink Of MIMO Heterogeneous Network

Multiple input multiple output(MIMO) technology, as a breakthrough in the development of modern communication technology, has been the research hotspot in the field of wireless communication. The application of MIMO technology in wireless communication system has important theoretical significance and practical value for improving the system capacity, improving the transmission quality and achieving high data rate transmission. However, in the process of bringing capacity and performance improvement, the MIMO wireless system needs to deal with more complex interference management scheme, especially for the heterogeneous wireless communication system.Most of the existing interference management schemes analysis based on homogeneous networks. And the next generation of mobile communication systems will be a diversified network model, and the heterogeneity will be an important feature. The traditional interference management scheme based on the homogeneous network model is relatively simple because of the characteristics of the homogeneous network model. At present, the research on the interference management scheme for heterogeneous network model is still immature. Because of the characteristics of the configuration of the heterogeneous network, in the design of interference alignment scheme for MIMO wireless heterogeneous networks, more and more schemes are needed to consider the feasibility and the performance of the system..In this paper, the research background and the development of MIMO wireless communication network are described in this paper, and then the interference alignment scheme is introduced in detail. The existing interference alignment scheme is introduced, and the theoretical results and the limitations of the scheme are systematically analyzed. Then we introduce a more general wireless heterogeneous network model, and propose a new interference alignment scheme based on space compression and two level null-space.After explaining the design scheme and feasibility of the proposed interference alignment scheme, this paper presents the design of the scheme design of the system with the degree of freedom under the specific system configuration. By comparing the performance of the system under the same configuration, the numerical simulation results are also verified the theoretical derivation of the relevant conclusions and performance improvement.