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作 者:王丹[1] 张怡凡 杜颜敏 WANG Dan;ZHANG Yifan;DU Yanmin(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)
机构地区:[1]重庆邮电大学通信与信息工程学院
出 处:《南京邮电大学学报(自然科学版)》2019年第3期39-44,共6页Journal of Nanjing University of Posts and Telecommunications:Natural Science Edition
基 金:国家科技重大专项(2017ZX03001021)资助项目
摘 要:针对超高速模式下多普勒频偏使接收端相关峰值的能量泄漏,从而导致出现多个伪峰且增加了虚警概率的问题,提出了超高速模式下随机接入前导检测算法。该算法利用相关峰值的偏移取决于初始物理根序列号和ZC序列长度的特性,通过选取特定的初始物理根序列号使相关峰值的偏移集中在单个搜索窗口内,采用单个搜索窗口进行前导检测。仿真结果表明,与传统的三窗口联合检测算法和五窗口联合检测算法相比,文中提出的算法有效降低了前导检测的虚警概率和漏检概率,解决了多普勒频偏大于PRACH单位子载波间隔造成多个伪峰对检测性能带来的影响。Aiming at the problem that the Doppler frequency offset in the super-high-speed mode causes the energy of the correlation peak at the receiving end to leak,resulting in multiple pseudo-peaks and increasing the false alarm probability,a random access preamble detection algorithm in ultra-high-speed mode is proposed.The algorithm utilizes the correlation peak offset according to the characteristics of the initial physical root sequence number and the length of the ZC sequence.By selecting a specific initial physical root sequence number,the offset of the correlation peak is concentrated in a single search window,and a single search window is used for preamble detection.The simulation results show that compared with the traditional three-window joint detection algorithm and the five-window joint detection algorithm,algorithm proposed in the paper effectively reduces the false alarm probability and missed detection probability of the preamble detection,and solves the influence of multiple pseudo peaks on the detection performance caused by the Doppler frequency offset greater than the PRACH unit subcarrier spacing.
关 键 词:多普勒频偏 随机接入 前导检测 初始物理根序列号 单个搜索窗口
分 类 号:TN929.5[电子电信—通信与信息系统]
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