结构化导频序列设计及低复杂度检测算法  

Algorithm for structured pilot sequence design and low complexity detection

作　　者：周佳鑫 沈炳声 周正春 范平志[2] 骆喆 ZHOU Jiaxin;SHEN Bingsheng;ZHOU Zhengchun;FAN Pingzhi;LUO Zhe(School of Mathematics,Southwest Jiaotong University,Chengdu 611756,China;School of Information Science and Technology,Southwest Jiaotong University,Chengdu 611756,China;Shanghai Huawei Technologies Co.LTD,Shanghai 201206,China)

机构地区：[1]西南交通大学数学学院,四川成都611756 [2]西南交通大学信息科学与技术学院,四川成都611756 [3]上海华为技术有限公司,上海201206

出　　处：《西安电子科技大学学报》2020年第6期45-49,121,共6页Journal of Xidian University

基　　金：国家自然科学基金国际合作交流项目(61661146003)。

摘　　要：大规模随机接入是5G的三大应用场景之一。在该场景下,需要构造支持海量用户的导频序列,同时设计低复杂度检测算法。基于确定性的低相关序列集作为导频序列,利用导频序列的循环结构和离散傅里叶变换实现低复杂度检测。研究结果表明,与传统的随机导频序列相比,这种导频序列具有实现简单、存储空间小等优势。此外,通过使用分块快速傅里叶变换,可大大地减小矩阵的乘法运算,加速了活跃用户的检测。仿真结果表明,文中构造的确定性导频序列集比同等大小的高斯随机序列集性能更优。Massive random access is one of the three major application scenarios of 5G.In this scenario,pilot sequences supporting a large number of users need to be constructed,and low-complexity detection algorithms should be designed.In this paper,some deterministic low correlation sequence sets are used as the pilot sequence set.The low complexity detection algorithm is realized by using the cyclic structure of the pilot sequence set and the discretefast Fourier transform(FFT).Research shows that,compared with the traditional random pilot sequence,the pilot sequence proposed in this paper has the advantages of simple implementation and small storage space.Furthermore,the block fast Fourier transform can greatly reduce the matrix multiplication operation and accelerate the detection speed for active users.Simulation results imply that the deterministic pilot sequence set constructed in this paper performs better than the gaussian random sequence set of the same size.

关 键 词：随机接入 导频序列集 近似消息传递算法 快速傅里叶变换 活跃用户检测与信道估计 

分 类 号：TN915.65[电子电信—通信与信息系统]