The Research On Digital Adaptive Beam Former Of Smart Antenna

The smart antenna is one of the key technologies of the third generation mobile communication system, and it introduces the pattern of space division multiple access to differentiate the signals with the same frequency, the same time slot and the same code by which have different transmission paths. The smart antenna can be used with other multiple access technologies, so the range of communication resource extends from time region, frequency region and code region to space region. The technology of smart antenna can remarkably increase the capacity of communication system, and limited frequency spectrum resource will be utilized sufficiently. Adaptive algorithms for beam forming are used to produce spatial and directional beam in smart antenna. Then the main beam aims at the coming direction of desired user and the side lobe or null points to the coming direction of interference user, which is based on the spatial information of users, so the signal of desired user will be enhanced, and the signal of interference user will be restrained. If adaptive...