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为了实现对快变信道环境下的多输入多输出正交频分复用(MIMO OFDM)系统信道估计,提出了一种基于多项式的基扩展模型(BEM),并联合迭代判决反馈并行干扰抵消(PIC)检测的信道估计算法.利用BEM将信道估计转化为对少量模型参数估计的特性,并结合PIC检测算法,以达到精确信道估计和消除载波间干扰的目的.仿真结果表明,该算法与传统最小二乘、线性最小均方误差信道估计算法相比,在误码率约为10-3时,信噪比增益为5dB左右.此外,新算法不需要知道信道的时域统计特性,且采用了移相正交导频设计,在一定程度上降低了信道估计的复杂度.
In order to realize the channel estimation of multiple-input multiple-output OFDM (Orthogonal Frequency Division Multiplexing) system in a fast changing channel environment, a polynomial-based basis extension model (BEM) is proposed and combined with iterative decision feedback parallel interference cancellation PIC) channel estimation algorithm.BEM is used to transform the channel estimation into a small number of model parameters estimation characteristics, combined with PIC detection algorithm to achieve the purpose of accurate channel estimation and elimination of inter-carrier interference.The simulation results show that the algorithm and the traditional Compared with the least squares, linear minimum mean square error channel estimation algorithm, when the bit error rate is about 10-3, the SNR gain is about 5dB.In addition, the new algorithm does not need to know the statistical properties of the channel in time domain, The phase shift orthogonal pilot design, to a certain extent, reduces the complexity of channel estimation.