MIMO-OFDM系统中的信道估计算法设计

MIMO-OFDM信道估计算法中,基于相位偏移导频结构的时域最小二乘算法,具有实现过程简便、精度高等特点,但是该算法需要通过复数计算完成。为了降低计算量、节省系统存储空间,对算法进行了两方面的改进:①提出一种由实数构成的新的导频结构;②根据新的导频结构,利用离散哈特莱变换提出新的信道估计算法。由于采用了离散哈特莱变换,算法只需要通过实数计算完成,能够有效降低计算复杂度。与通过复数计算的结果相比,算法没有造成计算精度的下降。采用Matlab软件进行仿真,验证了该导频结构和算法的有效性及可靠性。

Design for the Channel Estimation Algorithm of MIMO-OFDM Systems

Channel estimation has become a key technology in multiple-input multiple-output(MIMO) orthogonal frequency division multiplexing(OFDM) systems,in which,phase shifted pilots(PSP)-based least square(LS) method is characteristic with convenience and high performance,but it is based on plural computation. In order to reduce computing load and save memory,the algorithm is improved in two aspects.First,a real number pilot structure is presented.Second,adopting the new pilot structure and Discrete Hartley Transform(DHT) in the LS channel estimation algorithm,a simple but precise estimator is derived,which can finish estimating by using real number computation.Compared with the results by plural computation,the new algorithm doesn't cause the decrease in calculation accuracy.Matlab simulation results demonstrate the effectiveness and reliability of the proposed pilot structure and channel estimation algorithm.