提出了一种阵列天线MC-CDMA系统用户波达方向估计算法.该算法首先利用MC-CD—MA系统用户扩频码的正交性、子载波频域分集性,进行用户信号的分离、多址干扰的抑制和用户信号的增强,然后再通过传统波达方向估计的子空间算法实现用户信号波达方向的估计.仿真结果显示所提出算法在估计阵列天线MC-CDMA系统用户波达方向时,波达角估计误差很小,表明了算法的有效性:
In this paper, a Direction of Arrival (DOA) estimation algorithm is proposed for uplink MC- CDMA system with antenna array. By utilizing the orthogonality of spreading codes and frequency di- versity of MC-CDMA, the users' signals are separated and enhanced, and the multiple access interference (MAI) is suppressed. After that the conventional subspace based on DOA estimation is applied to estimate the DOAs of users' signals. Simulation results show that the error of estimating users' DOA is small enough to effectively distinguish users' DOA respectively.