一种改进的快速递推干扰抵消多用户检测算法

A FAST RECURSIVE INTERFERENCE CANCELLATION ALGORITHM WITH LOW COMPLEXITY

摘要:

由于传统的MIMO-OFDM系统干扰消除多用户检测算法对错误传播和干扰消除顺序考虑的较少,针对这一缺点,提出一种采用逆向排列顺序的快速递推干扰消除多用户检测算法。该算法采用逆向检测顺序,选择用户数据相关程度最大的数据进行最后检测,得到信噪比最优的串行干扰消除用户排列,避免了错误传播；采用递推的方法实现最小均方误差(MMSE)检测器与排序的求取,避免了传统检测算法中的直接矩阵求逆运算,降低了算法的计算量。理论分析和实验结果表明,该算法在有效降低复杂度的同时,具有更好的系统容量性能和误码性能。

Abstract:

【】In multi-user detection of MIMO-OFDM system, the detection order and error propagation are less consideration in traditional interference cancellation algorithm. Aiming at these shortcoming, a novel fast recursive successive interference cancellation multi-user detection algorithm with inverse detection order is presented. In the algorithm, the detection order is inversed and it chooses the user’s data with the maximum correlation to detect at last and prevent the error propagation efficiently; the MMSE filter matrices and the detection order are successively computed from the previously obtained filter matrices, so that the algorithm complexity is reduced significantly. Theory analysis and simulation shows that the proposed detection algorithm has the lower computational complexity and better performance.