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针对移动通信中目标方位变化比信道衰落变化慢的特点,首先利用子空间分解法估计出目标信号的导向矢量,并用估计出的导向矢量构造一个约束条件,然后用业务信号在约束最小二乘准则下估计信道矢量,本文用带投影的迭代最小二乘(ILSP)算法求解约束最小二乘问题,导频用于ILSP)算法的初始化,通过ILSP算法的迭代过程,可以逐步提高信道矢量估计和符号检测的精度.仿真结果表明:与传统二维RAKE接收机相比,本文提出的算法使系统的性能得到了有效改善.
Aiming at the characteristics that the change of target azimuth in mobile communication is slower than that of channel fading, firstly the steering vector of the target signal is estimated by using the subspace decomposition method and a constraint condition is constructed by using the estimated steering vector. Then, In this paper, Iterative Least Square (ILSP) algorithm with projection is applied to solve the constrained least squares problem, and the pilot is used to initialize the ILSP algorithm. By iterating the ILSP algorithm, the channel vector estimation and sign The simulation results show that compared with the traditional two-dimensional RAKE receiver, the proposed algorithm can effectively improve the performance of the system.