The invention belongs to the technical field of wireless communication, in particular to a signal detection method and device in a multi input and multi output wireless communication system. The present invention detects and recovers the transmitted signal vector using received signal vectors and estimated channel information. The device of the invention comprises a preprocessing unit, a set of K Best processing units and a set of zero forcing processing units. The preprocessing unit decomposes the channel matrix into real numbers and decomposes them into QR, thus forming a tree search process. KBest processing unit extended the upper retaining all child nodes of the parent node and calculate the Euclidean distance, a Euclidean distance K ultimately retained the smallest node transfer to the next level. The zero forcing processing unit extends the upper layer to retain the smallest child of the Euclidean distance increment in the parent node. In addition, the candidate generation technology, candidate value sharing structure and shift add technology are adopted. The invention reduces the computational complexity of the MIMO signal detection and improves the speed of the MIMO signal detection.
【技术实现步骤摘要】
【技术保护点】
一种多输入多输出无线通信系统ＭＩＭＯ信号检测方法，设Ｎ×Ｎ阶ＭＩＭＯ－ＯＦＤＭ无线通信系统，其基带等效数学模型如式１所示：ｙ＝ＨＳ＋ｎ１其中ｙ＝［ｙ↓［１］，ｙ↓［２］，ｙ↓［３］，．．．，ｙ↓［Ｎ］］是Ｎ×１维复数接收信号向量，Ｓ＝［Ｓ↓［１］，Ｓ↓［２］，Ｓ↓［３］，．．．，Ｓ↓［Ｎ］］是Ｎ×１维发送信号向量，其元素Ｓ↓［ｉ］是从一个有限的复数星座图样（Ω）中独立地选取，星座图样是ＱＰＳＫ、１６－ＱＡＭ或者６４－ＱＡＭ中的一种，Ｈ是Ｎ×Ｎ维的复数无线信道矩阵：＊＊＊２其中点作为本层保留节点传递给下一层；在搜索树的后Ｍ层采用迫零搜索方式：对于上层保留的父节点，只扩展其欧式距离最小的子节点；本层扩展的所有子节点全部保留并传递给下一层；选取搜索树最后一层中欧式距离最小的节点，将其对应的发射信号向量图样＊作为发送信号向量Ｓ的最终检测结果；参数Ｋ和参数Ｍ为用户定义参数，这两个参数可实现复杂度和检测性能之间的平衡。ｈ↓［ｉｊ］是从第ｊ个发射天线到第ｉ个接收天线的信道响应，并且为零均值，单位方差的高斯变量，ｎ＝［ｎ↓［１］，ｎ↓［２］，ｎ↓［３］，．．．，ｎ↓［Ｎ］］是Ｎ×１维复高斯噪声；其特征...
【技术特征摘要】
【专利技术属性】
技术研发人员：任俊彦，刘亮，马小晶，李凯，叶凡，许俊，李宁，
申请(专利权)人：复旦大学，
类型：发明
国别省市：31[中国|上海]
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