面向GPU的5G新型无线电的高吞吐率LDPC译码器

提出了一种基于图形处理单元(graphic processing unit, GPU)的5G软件无线电准循环低密度奇偶校验(low density parity check, LDPC)码译码器,为了节省片上和片下带宽,采用码字缩短和打孔技术、两级量化和数据打包方案,以提升数据带宽的利用率。实验基于Nvidia RTX 2080Ti GPU平台实现了高码率情况下的最小和近似译码算法的并行译码,通过分析GPU上的最优线程设置,将码率为5/6的(2 080,1 760) LDPC算法的译码吞吐率提升至1.38 Gbit/s,译码吞吐率性能优于现有其他基于GPU的LDPC译码器。     

Note: Minimizing the variability of the waiting times in a globally gated elevator polling system

A polling system comprising n queues and a single server is considered. Service is performed according to an elevator scheme under the globally gated regime. The problem of arranging the channels to minimize a measure of the variability of the waiting times is addressed. © 1997 John Wiley & Sons, Inc. Naval Research Logistics 44: 605–611, 1997     

捷联惯导+G/G接收机+星光组合导航应用研究

提出了适用于高空导弹的以捷联惯导为主,G/G接收机、星光导航为辅的组合导航方式,对组合方式进行了讨论,并给出了捷联惯导+G/G接收机+星光组合导航的原理图。     

A queueing system with vacations after N services

This article is devoted to the study of an M/G/1 queue with a particular vacation discipline. The server is due to take a vacation as soon as it has served exactly N customers since the end of the previous vacation. N may be either a constant or a random variable. If the system becomes empty before the server has served N customers, then it stays idle until the next customer arrival. Such a vacation discipline arises, for example, in production systems and in order picking in warehouses. We determine the joint transform of the length of a visit period and the number of customers in the system at the end of that period. We also derive the generating function of the number of customers at a random instant, and the Laplace–Stieltjes transform of the delay of a customer. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 646–658, 2015     

二维相关的G0分布雷达杂波仿真

G0分布模型可实现对不同均匀度雷达杂波的较好拟合,二维相关G0分布雷达杂波的精确仿真对雷达系统设计和性能评估具有重要意义。在利用分段多项式拟合的方法近似表示非线性变换的基础上,将二维相关的高斯随机过程作为输入,提出了基于无记忆非线性变换的二维相关G0分布雷达杂波仿真方法。更进一步,为了实现对杂波幅度与相关性的独立控制,并仿真具有同相和正交分量的相参雷达杂波,推导了单视条件下G0分布模型的球不变随机过程特征函数表达式,提出了基于球不变随机过程的仿真方法。仿真结果表明,这两种方法均能够仿真产生满足幅度和相关性要求的二维相关G0分布雷达杂波。