一种MIMO-OFDM信道估计方法

为提高现有MIMO-OFDM系统信道估计算法性能,降低算法运算的复杂性,提出一种基于变换域的MIMO-OFDM信道估计方法.该算法不需要任何信道统计信息,通过变换域内自适应低通滤波器降低了高斯白噪声和子载波间干扰对该估计算法准确度的影响,并且利用在变换域内得到的导频位置的信道估计结果,通过补零内插算法得到其他子载波位置的信道估计结果.仿真结果表明:该算法的误码率性能优于最小平方算法,稍逊于线性最小均方误差算法;该算法计算复杂度低,易于在实际系统中实现.

A channel estimation method for MIMO - OFDM system

A transforming domain-based channel estimation method for multiple input multiple output-orthogonal frequency division multiplexing(MIMO-OFDM) system was developed to enhance the performance of MIMO-OFDM system while reducing the computation complexity.The effects of additive white Gaussian noise and intercarrier interference on accuracy of the method were reduced using self-adaption low pass filtering without any prior knowledge of channel statistics.The channel impulse response for all the subcarriers was obtained by zero-padding DFT/IDFT.Simulation results show that the bit error rate(BER) performance of the proposed method is better than that of least-squares(LS) method,and somewhat weaker than that of least mean square(LMS) method.The computing complexity of the proposed method is reduced and it is easy to be realized in practical system.