多用户数字波束形成中的目标辨识方法

Object identification methodology in multi-user digital beamforming system

传统波束形成中,虽然可以通过波达方向(DOA)估计得到期望信号和干扰信号的空间信息,但并不能对二者进行区分。根据移动通信CDMA系统中多用户检测的原理,在用户发送端给不同期望用户分配不同的伪随机码作为标识码,接收端通过相关检测可以很好地区分不同期望信号和干扰信号。仿真结果表明了该方法能保持辨识系统低的虚警概率和漏警概率,准确辨识出特定期望用户的方向。

In the content of traditional Digital BeamForming （DBF）, it cannot implement the identification between the user signals and interferences, although the Direction Of Arrival （DOA） estimation strategy digs out the spacial information of these signals. Similar as the multi-user detection in CDMA mobile communication system, different users were allocated with one pseudo-random （PN） codes in the transmitters respectively. Furthermore, the receiver generated the replicas of transmitted PN codes and did correlation calculation with the received signals to harnesses the identification. The simulation results illustrate that the proposed approach picks up the desired signals and ensures the low false alarm rate and missing detection rate.