A Study On Detection Algorithm In MIMO System Based On Lattice Reduction

Multiple-input multiple-output(MIMO)technology can achieve a significant increase in channel capacity and spectrum utilization in wireless communication systems without increasing system bandwidth and transmitting power,it is considered to be one of the key core technologies in the 4G network that is now promoting coverage and the next generation of 5G network.Due to the existence of the time-varying,fading and multipath interference in the wireless channel,it is very important to recover the transmitted symbol information at the receiver through the effective decoding algorithm.At the same time,there is a phenomenon that the decoding algorithm with well performance,its computation complexity is relatively high,and some low complexity decoding algorithms have relatively poor performance.In view of the above two problems,this article starts form the establishment of the MIMO system model,and relies on detailed theoretical analysis to select the relative optimal decoding algorithm to achieve a better balance between detection performance and computational complexity.The main works of this thesis are the following aspects:Firstly,this thesis introduces several classical MIMO detection algorithms,by introducing the lattice reduction algorithm which can improve the singularity of channel matrix,realize the optimization of the classical MIMO detection scheme,the simulation results also show that the performance of the algorithm can be improved compared with the classical detection algorithm;Secondly,this thesis mainly introduces the inter-forcing detection algorithm,starting from its structure and principle,put forward the corresponding key problem of the integer-forcing and discusses its common solutions,and creatively pointed out that the lattice reduction algorithm can assistant to solve the problem which is find the important coefficient matrix of the integer forcing,so as to achieve a significant improvement in performance while maintaining a lower computational complexity;Finally,based on the space-time coding MIMO system can improve the system capacity and spectrum utilization rate,so we consider apply the integer-forcing algorithm to the space-time coding system,from the theoretical point of view,the space-time coding system adopting the integer-forcing can obtain the full diversity order,and put forward the corresponding design criteria,and show that space-time block coding that satisfy the non-vanishing signal value criterion provide full-diversity for the integer-forcing linear receiver,then the performance analysis of single user space-time coding is further extended to the multi-user space-time coding system,through the theoretical proof and simulation results of multi-user space-time coding MIMO system by integer forcing decoding can achieve full diversity reception.