多用户检测重扩智能天线研究

A Smart Antenna with Multiuser Detection and Respreading

提出由最小均方误差算法(LMS)实现的自适应天线阵+盲多用户检测组成的智能天线方案.自适应天线阵形成指向用户的波束,波束输出经多用户检测解调出用户数据,而LMS自适应天线阵所需的参考信号由解调出的用户数据重扩产生.数值仿真结果表明,该方案比匹配滤波器解扩重扩天线阵有更好的性能;而与多用户检测+波束合成的时空处理方案相比,我们提出的方法计算量要少.

A smart antenna that consists of a LMS adative array followed by a blind multiuser detection is proposed, where the beam pointing to the wanted user is formed by the adaptive array and the user data are demodulated via the multiuser detection from the output of the adaptive array. The referent signal for the adaptive array is constructed by respreading the demodulated data with the spread code of the wanted user. Simulation shows that the proposed antenna is better than the match filter de-spread re-spread antenna array. Compared with the time-space method using multiuser detection followed by beamformers, the proposed method saves more computation.