Research On Adaptive Beamforming Algorithm Of Smart Antenna

As a very promising research for wireless communication technologies,smart antenna is now used in communication systems successfully.It uses modern digital signal processing techniques and selects appropriate adaptive algorithms to form space directional beam dynamicly.The main beam aims at the coming direction of reference user and the side lobe points to the coming direction of interference users, which taking full advantage of mobile users to achieve the purpose of offsetting or suppressing interference signals to the greatset extend.The main research work is focused on adaptive beamforming algorithms.Given the mathematical model of mobile channel,the performance of several blind and non-blind adaptive beamforming algorithms,By simulating with Matlab and comparing,it summarizes the advantages and disadvantages of each algorithm from the simulation results.Then based on the problem of the constant modulus algorithms capturing the interference signals,a widely used constant modulus algorithm based on minimal Rayleigh entropy is proposed,which can has better capability when we adjust the joint coefficient effectively.Then, this thesis proves the amelioration of the new algorithm by simulating with Matlab.Finally the article analyzes several multi-users separation algorithms for CDMA system.Two multi-users separation algorithms which are used at present are introduced and gives the computer simulation results as well.After summarizes the disadvantages of the algorithms,it gives some advices,in order to make preparation for the third generation mobile communication.