The Design Of Interference Cancellation?Dodging And Recycling In Wireless Communication

With the development of wireless communication technology and the explosive growth of user data,people have put forward higher requirements for data rate and system capacity.Because of the widespread use of hierarchical structure or heterogeneous networks and the high density of network deployment,interference has become the key to restricting network performance.Interference management technology is an important technology to provide effective and reliable data transmission in wireless communication networks.Therefore,how to carry out interference management and improve the spectrum efficiency of the system is the focus of this thesis.Firstly,based on coordinated multi-point transmissions based on interference alignment and neutralization mechanism,a flexible distributed interference alignment and neutralization implementation method for maximum achievable degree of freedom of the system is proposed.The number of maximum achievable degree of freedom of the system is determined by the number of receiver side antennas and the number of receivers.Then the interference neutralization is realized in centralized or distributed implementation,and according to the expression form of the system achievable degree of freedom,the interference alignment should be realized in a distributed implementation or centralized implementation.This method flexibly adopts a distributed implementation to obtain the maximum degree of freedom of the system,makes full use of the spatial multiplexing capability provided by the multiple antennas system,and achieves an improvement in the system throughput performance.In the research we discovered that the interference management requires the consumption of certain wireless resources,and these resources can also be used for data communication.Therefore,how to rationally allocate wireless resources to optimize the performance of the system has become an important issue.Next,we study the interference management and spatial degree of freedom allocation technology in heterogeneous networks.The idea of interference dodging was put forward,the necessity of interference dodging was demonstrated,and the conditions for the occurrence of interference dodging were analyzed.Because interference dodging avoids the influence of interference by changing the direction of the desired transmission,it is a form of passive evasion of interference.This thesis combines several typical active interference management methods with interference dodging and proposes a new method of interference management.Defining the efficiency of interference management,adaptive selection of interference management methods,and achieving efficient interference management.People's attitude towards interference is mostly used as a negative factor that affects communication,and they are eliminated or suppressed by means of resource division or signal processing.In fact,the signal energy of the interference and/or the data information it carries can be used by some technical means to improve the data transmission performance of the communication system.Based on this,this thesis proposes an interference recycling transmission mechanism.From the relative representation of data symbols,a desired transmitter is used to create a signal for interference recycling,so that the expected data information is regenerated from the interference at the expected receiver after filtered.Finally,the thesis summarizes the research work and prospects the possible future research direction.