一种新的自适应盲波束形成算法

DS—CDMA系统的智能天线技术可以增加其有效覆盖区域，并能提高系统的抗干扰性能。因而，快速的自适应波束形成算法是一个重要的课题。提出和研究了一种新颖的适合于自适应盲波束形成的算法，该算法基于数字信号的有限符号特性，采用预判决映射（DP）方法，结合归一化最小均方（NLMS）算法，具有较低的计算复杂度，比较适合于实时处理场合。计算机仿真结果表明，新算法具有较好的收敛性、跟踪性能以及较低的误码率特性。

A New Adaptive Blind Beam-Forming Algorithm

Smart antenna of DS-CDMA(Direct Sequence-Code Division Multiple Access) system can expand its communicating region and improve its properties of anti-interference.So study on adaptive beam forming algorithms of smart antenna plays a key role in technology of smart antenna.In this paper we present a new adaptive blind beam-forming algorithm for DS-CDMA system.The algorithm is introduced and analyzed in detail.The algorithm is based on the finite symbol property of the digital signal in combination with the traditional adaptive algorithm,which is called the Normalized Least Mean Square(NLMS)algorithm.Therefore,the algorithm has very low computational complexity and can easily be used in some special fields of real-time applications.Computer simulation results are presented to show that the algorithm exhibits some good performances such as excellent convergence,tracking capability,as well as lower BER(bit error rate).