基于子载波SNR最优的快衰落MIMO-OFDM系统干扰消除方法

An Interference Cancellation Algorithm Based on Maximum SNR on Subcarriers for Fast Fading MIMO-OFDM Systems

针对OFDM(orthogonal frequency division multiplexing)系统中由于时变信道引入的载波间干扰消除问题,分析了MIMO-OFDM系统各接收天线频域中子载波上信号的信噪比,提出了一种基于子载波信噪比最优的联合时域干扰消除方法.分析表明,目标问题是一个广义Rayleigh熵问题,并且利用信道干扰矩阵主要能量分布在对角线的特点可以进一步减少算法的计算量.文中提出的干扰消除方法具有较好的性能,且对信道估计误差不敏感.

It is known that fast time varying channel could cause intercarrier interference at OFDM receiver and in this paper the signal noise ratio（SNR） on all subcarriers of receiver antennas in frequency domain in MIMO-OFDM system is analyzed. Also a new kind of interference cancellation algorithm in time domain for MIMO-OFDM system is proposed. Theoretical analysis proves that the problem can be solved by generalized Rayleigh quotient method. Furthermore,the computation burden of the algorithm could be reduced for the energy concentrates along the main diagonal in the interference matrix. Simulation results validate the theory analysis in this paper and suggest that the algorithm is not sensitive to channel estimation error.