摘要
为了消除正交频分复用(OFDM)系统在时频双选信道条件下由于信道快时变带来的载波间干扰,本文提出了一种新的低复杂度迭代干扰抵消方法。为了消除载波间干扰,已经提出了不少方法,但这些方法要么因为矩阵求逆运算带来了高计算复杂度,要么以性能退化为代价换来低计算复杂度。利用并行迭代干扰抵消技术,本文算法可以明显改善系统性能,同时借助带状矩阵近似和最小二乘QR分解(LSQR)迭代计算的特点来降低计算复杂度。仿真结果表明,在高信噪比条件下,随着迭代次数的增加,本文所提出的算法可以有效的减少"地板效应",在系统性能和计算复杂度之间取得更好的折中。
A novel low complexity iterative interference cancellation scheme is proposed in order to eliminate inter-carrier interference（ICI） which is introduced by rapid channel variations of doubly-selective channels in orthogonal frequency division multiplexing（OFDM） systems.Although some methods have been proposed to mitigate ICI,they either have high complexity caused by matrix inversion or low complexity at the cost of performance degradation.By using parallel interference cancellation（PIC）,the proposed scheme can significantly improve the system performance while preserving the low computation complexity by means of band matrix approximation and least squares QR（LSQR） iterative computation.Simulation results show that the proposed scheme can effectively reduce the error floor with increase of iteration number at high signal-to-noise ratio（SNR） environments and obtain a better trade off between computation complexity and system performance.
出处
《电路与系统学报》
CSCD
北大核心
2010年第4期125-128,119,共5页
Journal of Circuits and Systems
基金
国家863计划(2008AA01Z227)
关键词
正交频分复用
载波间干扰
并行干扰抵消
低复杂度
orthogonal frequency division multiplexing（OFDM）
Inter Carrier Interference（ICI）
parallel interference cancellation（PIC）
low complexity
