The Research Of Smart Antennas Algorithm Based On Software-Radios

Since Jeo Mitola bring forward the Software-Radios in 1992,it acquired great evolve in a few years, it aimed at some questions existent in wireless domain presently, such as multi-system (such as GSM, DAMPS, PCS.) coexists, diversified criterions (such as WCDMA, CDMA-2000, TD-SCDMA.) competes intensely, the spectrum resource tension. Software-Radios breach the conventional radios that design of hardware core function singleness, dispatch expansibility, em phasize the opening simple hardware currency plat roof, use upgrade, configure application soft ware to achieve the new thought of design for many wireless functions.Smart antennas is the adaptive antennas that having definite degree brainpower. The fundamental principle is to change performance of antenna pattern through controlling software algorithms and adjusting phase of array element, real-timely process receiving signal, achieve adaptive beamforming and cause zero position of antenna to align interference direction in order to enhance signal gain.In mobile communication, the position of user stochastically changes and the exist of many interferences, so the rate of algorithm and precision should enough high, this is the key of whether or not smart antenna technology can practical application, to implement the smart-antenna intelligentize, this article via each kind of intelligence algorithm system to compare, emphasize use nulling widen algorithm space smoothing algorithm and eigenstructure algorithm exercise in beamforming. exploiture corresponding MATLAB program to prosecute simulation, the outcome indicate that the methods is validity.This article also introduces several aspects the knowledge of background such as the mobile communication,smart antennas,beamforming and the smart antennas of software-radios and so on. in order to define the position of communication territory of research in the nowadays.