智能天线中一种迭代的联合信道估计与符号检测算法

Iterative Algorithm of Joint Channel Estimation and Symbol Detection in Smart Antenna

在传统的二维RAKE接收机中 ,通常使用导频信道来估计信道矢量 ,进而求取加权系数 ,用于业务信道符号序列的检测 .当导频功率较低时 ,信道估计误差较大 ,系统性能较差 .本文提出了一种新的算法 ,先利用导频进行信道矢量的初始估计 ,然后用带投影的迭代最小二乘法 ,进行信道和符号序列的联合估计 ,该算法具有计算复杂度低 ,收敛速度快的特点 .仿真结果表明 :与传统二维RAKE接收机相比 ,该算法使系统的误码性能得到了有效改善 .

Channel vector was estimated only by utilizing pilot channel in conventional 2-D RAKE receiver. The weights were further calculated to detect the symbol sequences in traffic channel. The estimation error will be large when the power of pilot is low. A novel algorithm was proposed in this paper. We employed pilot to get the initial channel vector in the first instance. Iterative least squares with projection algorithm was then used to estimate the channel symbol sequences jointly. This algorithms is characterized by low computation complexity and rapid convergence rate. Computer simulation demonstrates that the algorithm has improved the system performance effectively compared with conventional 2-D RAKE receiver.