高速移动环境下基于多天线角域分辨力接收算法

Multiple Antennas Angle Domain Resolution Based Transceiver Algorithm for High-speed Mobile Environment

在高速移动环境下,OFDM系统由于信道的时变性破坏了子载波间的正交性,而使系统性能急剧下降。针对此问题,该文分析了高速移动产生的信号多普勒扩展的数学模型,提出了一种基于多天线角域分辨力接收算法。该算法采用正交角域子空间投影,将多普勒扩展简化为各个正交角域空间上的多普勒频移,并通过多普勒参数估计来抑制时变信道对系统性能的影响。仿真结果表明,在高速移动环境下,该文提出的算法有效地抑制了OFDM系统中子载波间干扰,获得了较好的系统性能。

In high-speed mobile environment, the orthogonality between different subcarriers in OFDM is destroyed and the performance for system decreases rapidly. In this paper, the mathematical model of Doppler spread caused by high-speed mobility is analyzed and a novel multiple antennas angle resolution based transceiver algorithm is proposed. In this algorithm, orthogonal angle domain subspace projection is utilized. The Doppler spread is simplified as Doppler frequency offset on each orthogonal angle domain subspace and Doppler parameter estimation is utilized to suppress the effect caused by high-speed mobility. Simulation results show that the proposed algorithm suppress the inter-carrier-interference of OFDM in high-speed mobile environment effectively and can achieve performance improvement.