宽带CDMA系统上行链路天线阵列信号到达角估计

Study of the direction of arrival estimation on antenna array signals in uplink of wide-band CDMA system

在多径时变信道环境中研究宽带CDMA天线阵列接收机基础上 ,应用MUSIC和二阶ES PRIT算法进行阵列信号最强径到达角估计 ;同时 ,提出了一种基于阵列收敛条件的导频辅助到达角估计算法 ,该算法利用自适应阵列收敛条件下正确跟踪期望信号方向的特点 ,搜索信号最强接收方向 ,并可将结果直接应用于下行链路波束成形权重计算 .仿真结果表明 ,提出的导频辅助到达角估计算法与MUSIC和二阶ESPRIT算法相比 。

Based on the study of antenna array applied to wide-band CDMA systems, MUSIC (multiple signal classification) and second-order ESPRIT (estimation of signal parameters via rotational invariance techniques) algorithm are employed in the estimation of direction of arrival of the strongest signals. A novel pilot-aided algorithm is proposed for the direction of arrival estimation of received signals, which uses the feature of the convergence of the antenna array to trace the direction of the desired signal correctly and the result can be applied to the calculation of the weight of the downlink beamforming. Simulation results show that the new algorithm achieves a better estimation accuracy when compared with the MUSIC and second-order ESPRIT algorithms on the condition of the convergence of the antenna array under the multipath environment.