The Research Of Smart Antennas Technique Based On Software-Radios

Software-Radios is a new system framework of wireless communications. It aims at some problems that being in the field of wireless communications for example in existence many systems (such as GSM, DAMPS, PCS.), dog-eat-dog diversified criterions (such as WCDMA, cdma-2000, TD-SCDMA.), frequency spectrum resource tension. Software-Radios is a developing research field. There will be a far-reaching influence on future communications even on future radio-technology if we achieve breakthrough in the field. 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. The key technology of realizing software-radios is that really intelligentize the smart antennas.In a mobile communication environment, the speed and accuracy of the spatial filtering algorithms must be rather fast and high in order to track the subscribers in real tune for the base station. So the speed is the key for smart antennas to be practical. In order to realize the intelligent of smart antennas, the emphases of this paper is that utilizing CMA into beamforming. At the same time, we exploit the corresponding program to emulate. The validity of the proposed method is validated through simulation.We also introduce some background of mobile communication, adaptive antenna, beamforming, the method of computer simulation to make our project's position in nowadays studies of communications to be clear.