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Joint Non-Orthogonal Multiple Access (NOMA) & Walsh-Hadamard Transform: Enhancing the Receiver Performance

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China Communications 2018年第9期15卷 160-177页

作者： Muhammad Rehan Usman Arsla Khan Muhammad Arslan Usman Soo young Shin Department of Electrical Engineering The Superior College (University Campus) Department of IT Convergence Engineering Kumoh National Institute of Technology (KIT) Department of Electrical Engineering COMSATS University Islamabad Lahore Campus

Non-orthogonal multiple access(NOMA) is a new access method to achieve high performance gains in terms of capacity and throughput, so it is currently under consideration as one of the candidates for fifth generation(5 G) technologies. NOMA utilizes power domain in order to superimpose signals of multiple users in a single transmitted signal. This creates a lot of interference at the receive side. Although the use of successive interference cancellation(SIC) technique reduces the interference, but to further improve the receiver performance, in this paper, we have proposed a joint Walsh-Hadamard transform(WHT) and NOMA approach for achieving better performance gains than the conventional NOMA. WHT is a well-known code used in communication systems and is used as an orthogonal variable spreading factor(OVSF) in communication systems. Application of WHT to NOMA results in low bit error rate(BER) and high throughput performance for both low and high channel gain users. Further, it also reduces peak to average power ratio(PAPR) of the user signal. The results are discussed in terms of comparison between the conventionalNOMA and the proposed technique, which shows that it offers high performance gains in terms of low BER at different SNR levels, reduced PAPR, high user throughput performance and better spectral efficiency.

关键词：存取方法接收装置多重直角表演连接产量性能通讯系统

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低空无人机探测技术的发展前景与趋势

现代雷达 2022年第4期44卷 99-100页

作者：刘光辉新疆工程学院能源工程学院乌鲁木齐830023

0引言随着当代高技术的迅猛发展,以及天基导航通讯系统等基础设施的建立,无人机发展迅速,已成为一种新兴的遥感平台,被广泛地应用于国土航测、农林植保、大气探测、灾害救援、国防安全等领域,尤其是轻小型无人机遥感系统在数量和应用领... 详细信息

0引言随着当代高技术的迅猛发展,以及天基导航通讯系统等基础设施的建立,无人机发展迅速,已成为一种新兴的遥感平台,被广泛地应用于国土航测、农林植保、大气探测、灾害救援、国防安全等领域,尤其是轻小型无人机遥感系统在数量和应用领域都占绝对主导地位。无人机遥感具有高科学价值,可以与卫星遥感能力形成互补。无人机具备超高分辨率、高频次获取能力,相比于有人机遥感,又具有较高的性价比和遂行性。

关键词：轻小型无人机超高分辨率无人机遥感低空无人机遥感平台遥感系统大气探测通讯系统

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基于CCF-PLS的通讯系统异常根因分析

华东理工大学学报（自然科学版） 2021年第1期47卷 67-73页

作者：郁枫杨帆熊智华清华大学自动化系北京信息科学与技术国家研究中心北京100084

针对通讯网络升级后出现的系统性能下降问题,提出了一种互相关函数-偏最小二乘(CCF-PLS)方法对系统性能进行监测,并给出导致系统性能下降的根本原因变量。对于大采样间隔且线性特性较强的通讯系统,PLS模型能很好地建立关键性能指标(KPI... 详细信息

针对通讯网络升级后出现的系统性能下降问题,提出了一种互相关函数-偏最小二乘(CCF-PLS)方法对系统性能进行监测,并给出导致系统性能下降的根本原因变量。对于大采样间隔且线性特性较强的通讯系统,PLS模型能很好地建立关键性能指标(KPI)与其他观测变量的回归模型。由于观测变量中存在较多与KPI不相关的成分,采用CCF能很好地筛选与KPI强相关的变量,因而可以作为前端处理步骤。在此基础上,结合贡献图方法,CCF-PLS给出导致系统异常的根本原因。仿真结果显示,本文方法具有良好的应用效果。

关键词：根因分析互相关函数偏最小二乘通讯系统异常诊断

Investigation of Cross-Correlation Characteristics for Multi-Link Channels in High-Speed Railway Scenarios

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China Communications 2018年第8期15卷 108-117页

作者： Tao Zhou Cheng Tao Liu Liu Kai Liu Institute of Broadband Wireless Mobile Communications Beijing Jiaotong University National Mobile Communications Research Laboratory Southeast University

This paper investigates the cross-correlation characteristics of large-scale parameters(LSPs) and small-scale fading(SSF) for high-speed railway(HSR) multilink propagation scenarios, based on realistic measurements conducted on Beijing to Tianjin HSR line in China. A long-term evolution-based channel sounding system is utilized in the measurements to obtain the channel data. By applying a proposed time-delay based dynamic partition method, multi-link channel impulse responses are extracted from the raw channel data. Then, the statistical results of LSPs, including shadow fading, K-factor, and root-mean-square delay spread are derived and the cross-correlation coefficients of these LPSs are calculated. Moreover, the SSF spatial correlation and cross-correlation of SSF are analyzed. These results can be used to exploit multi-link channel model and to optimize the next-generation HSR communication system.

关键词：隧道模型空间关联高速度连接特征铁路通讯系统阅读器

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基于FPGA的通讯系统设计与实现

基于FPGA的通讯系统设计与实现

作者：袁儒明合肥工业大学

学位级别：硕士

随着通信技术和通信业务的发展,电信网络向宽带综合业务数字网(Broadband Integrated Services Digital Network,B-ISDN)的方向发展。这要求通信网络和交换设备既要容纳非实时性的数据业务,又要容纳实时性的电视和电话信号业务。在这样... 详细信息

随着通信技术和通信业务的发展,电信网络向宽带综合业务数字网(Broadband Integrated Services Digital Network,B-ISDN)的方向发展。这要求通信网络和交换设备既要容纳非实时性的数据业务,又要容纳实时性的电视和电话信号业务。在这样的需求下,业务信息的准确性和信息传输的速率是非常重要的。本文基于B-ISDN协议中的物理层、ATM(Asynchronous Transfer Mode)层、AAL5(ATM Adaptation Layer 5)适配层、高层设计并实现了可双向传输业务信息的通讯系统。连续处理数据的测试表明,当测试数据量在30GB以内,通讯系统的误码率为0,信元丢失率为0,收发业务信息的速率最高达到120Mbps。同时,本文设计并实现的通讯系统具有较高的可移植性和适用性,对后期的开发具有较高的参考价值。论文的主要工作如下:首先,介绍了B-ISDN的协议,分析B-ISDN协议的内容,根据协议的分层特征,本文采用了“物理层+ATM层+AAL5适配层+高层”为通讯系统的主体结构。其次,基于FPAG的工作环境,结合通讯系统的主体结构,研究物理层、ATM层、AAL5适配层以及高层之间的层次关系,并分别对这些层进行设计。再次,分析各个层次的工作原理和设计方案,基于HDL语言,完成了各个模块的RTL设计和集成。最后,本文在通用验证方法学(Universal Verification Methodology,UVM)环境下对设计进行了功能验证;基于FPGA对通讯系统进行了原型验证;并在测试板卡环境下对通讯系统进行了性能测试。

关键词：通讯系统 FPGA B-ISDN ATM CELL AAL5

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面向6G的自适应同步通信技术发展前景

现代雷达 2022年第4期44卷 97-98页

作者：张克旺信阳农林学院河南信阳464000

0引言目前,6G移动通信技术是一种新兴的移动通信技术。6G将彻底改变个人生活、生活方式、社会、商业和通讯系统。现在是展望6G技术的潜在应用、用例和挑战的关键时刻。值得注意的是,6G将创造巨大的研究可能性,并使许多新技术成为可能。... 详细信息

0引言目前,6G移动通信技术是一种新兴的移动通信技术。6G将彻底改变个人生活、生活方式、社会、商业和通讯系统。现在是展望6G技术的潜在应用、用例和挑战的关键时刻。值得注意的是,6G将创造巨大的研究可能性,并使许多新技术成为可能。此外,6G将在多个领域被证明是一个改变游戏规则的范例。因此,有必要对6G技术进行展望,以彻底改变现代世界。目前,许多国家正在全力部署5G技术。

关键词：改变游戏规则通讯系统移动通信技术自适应同步用例关键时刻潜在应用

Introduction to the special column： communication, cooperation, and cognition in predators

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Current Zoology 2017年第3期63卷 295-299页

作者： Arik KERSHENBAUM Daniel T. BLUMSTEN Department of Zoology University of Cambridge Cambridge CB23EJ UK Evolutionary Biology University of California Los Angeles CA 90095-1606 USADepartment of Ecology and

An introduction is presented in which the editor discusses articles in the issue on topics including role of social effects in modifying communicative behavior of cooperative group-living meerkats; role of phylogeny a... 详细信息

关键词：捕食者交流合作社会性认知能力通讯系统群体生活回避反应

Exploring Channel Diversity in HF Communication Systems： A Matching-Potential Game Approach

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China Communications 2018年第9期15卷 60-72页

作者： Wen Li Lang Ruan Yifan Xu Yuli Zhang Yitao Xu Xinhong Shao College of Communications Engineering Army Engineering University of PLA Nanjing 210000 China Science and Technology on Communication Networks Laboratory Shijiazhuang 050000 China

This paper investigates the channel diversity problem in high frequency(HF) communication systems. Due to the limited HF spectrum resources, a HF communication system with shared channels is considered, where each user equipment(UE) has individual communication demand. In order to maximize the communication probability of the whole system, a matching-potential game framework is designed. In detail, the channel diversity problem is decomposed into two sub-problems. One is channel-transmitter matching problem, which can be formulated as a many-to-one matching game. The other is the transmitter allocation problem which decides the transmission object that each transmitter communicates with under channel-transmitter matching result, and this sub-problem can be modeled as a potential game. A multiple round stable matching algorithm(MRSMA) is proposed, which obtains a stable matching result for the first sub-problem, and a distributed BR-based transmitter allocation algorithm(DBRTAA) is designed to reach Nash Equilibrium(NE) of the second sub-problem. Simulation results verify the effectiveness and superiority of the proposed method.

关键词：通讯系统隧道 HF 游戏火柴匹配问题传输器用户设备

Breathers and Rogue Waves Derived from an Extended Multi-dimensional N-Coupled Higher-Order Nonlinear Schrdinger Equation in Optical Communication Systems

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Communications in Theoretical Physics 2018年第9期69卷 255-262页

作者：白成林蔡跃进罗清龙 School of Physics Science and Information Engineering Liaocheng University Shandong Province Key Laboratory of Optical Communications Science & Technology School of Computer and Information Anqing Normal University

In this paper, an extended multi-dimensional N-coupled higher-order nonlinear Schr¨odinger equation (NCHNLSE), which can describe the propagation of the ultrashort pulses in wavelength division multiplexing (WDM)systems, is investigated. By the bilinear method, we construct the breather solutions for the extended (1+1),(2+1) and(3+1)-dimensional N-CHNLSE. The rogue waves are derived as a limiting form of breathers with the aid of symbolic computation. The effect of group velocity dispersion (GVD), third-order dispersion (TOD) and nonlinearity on breathers and rogue waves solutions are discussed in the optical communication systems.

关键词：通讯系统非线性 inger 波浪多维方程繁殖系统超短波