一种排序分组组间用户干扰消除检测算法  

An ordered grouped and grouping users interference cancellation detection algorithm

作　　者：王艳丽[1] 张同琦[1] 金蓉[2,3] 

机构地区：[1]渭南师范学院数学与信息科学学院,渭南714000 [2]西安邮电大学通信与信息工程学院,西安710121 [3]西北工业大学电子信息学院,西安710129

出　　处：《南京大学学报（自然科学版）》2015年第2期354-360,共7页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金(61172071);陕西省教育厅科研计划(2013JK1071);渭南师范学院大学生创新创业训练计划(2014XK096)

摘　　要：通过对最小均方误差排序串行干扰消除检测算法理论分析,找出误差传播产生的主要原因,提出一种排序分组组间用户干扰消除检测算法.该算法采用斜投影原理对用户进行逆向排序,选择相关性最大的用户数据最后检测,再对用户数据进行分组,实现组间用户干扰抵消,组内用户通过最小均方误差检测之后再次进行最大似然检测,减少了误差传播,降低了算法复杂度.实验结果表明,改进算法提高了用户等效信噪比,降低了检测误码率.The minimum mean squared error ordered successive interference cancellation（MMSE-OSIC）detection algorithm is a bank of linear receivers,with the detected signal components successively canceled from the received signal at each stage.More specifically,the detected signal in each stage is subtracted from the received signal so that the remaining signal with the reduced interference can be used in the subsequent stage.By analyzing the MMSE-OSIC detection algorithm with the error propagation,we find out the estimation error can be reduced with the order,and the estimation of reliability can be increased,while the performance is related to detection order.In order to mitigate the impact of the error propagation,the paper proposes a detection algorithm of sorting group user interference elimination between groups.At the same time,the Oblique projection is a type of parallel projection,and it projects an image by intersecting parallel rays from the three-dimensional source object with the drawing surface.The algorithm adopts the Oblique Projection Principle to the user in reverse order,chooses the user data with maximum correlation to detect finally.Meanwhile,one of the shortcomings in the MMSE-OSIC is the high computational complexity.Inorder to alleviate the drawback,the paper groups the user data and then to achieve user interference offset between groups.And then it tests the users in the group by the maximum likelihood（ML）detection again after the minimum mean squared error（MMSE）detection to reduce the error propagation and the algorithm complexity.The theoretical analysis and experimental results show that the improved algorithm improves the user equivalent signal-to-noise ratio,reduce the detection error rate.

关 键 词：多用户检测 逆向排序 斜投影 分组接收 误差传播 

分 类 号：TN929[电子电信—通信与信息系统]