中文摘要：

针对MIMO-OFDM通信系统中基于导频的常规信道估计算法存在矩阵求逆过程，使算法计算量过大的现象，提出了一种基于最小二乘（LS）的信道估计简化算法。该算法利用分层结构的空时分组编码技量（LSTBC）和优化设计的导频符号，避免了LS算法的矩阵求逆过程，大大降低LS算法的复杂度和运算量。仿真结果表明，该方法在运算复杂度显著降低的情况下，仍可取得和原算法同样的性能结果。

英文摘要：

Traditional pilot-symbol aided channel estimation for MIMO-OFDM system suffers great compu tational work. An improved LS channel estimation method is proposed. The method avoids matrix inversioin by utilizing layered space-time block code（LSTBC） and optimally designing the pilot symbols, then the complexity and computational work of LS method is greatly reduced. Simulation results show that the performance of the improved method is same as the conventional one.