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An SISO-OTFS Channel Parameter Learning Scheme in Time-Frequency Domain 一种时频域sso - otfs信道参数学习方案
Wentao Kan, Xiandeng He, Nan Chen
Orthogonal Time Frequency Space (OTFS) modulation is a recently proposed modulation pattern aiming to overcome problems in high mobility scenarios. Parameter learning, including both the Delay-Doppler(DD) domain and the Time-Frequency(TF) domain learning, is one of the most important research direction of OTFS. Rough parameter learning in the TF domain is preferred for its lower cost. In this paper, we proposed a Time-Frequency domain parameter learning scheme in Single-Input Single-Output OTFS (SISO-OTFS) scene. Firstly, the 2D uplink(UL) channel model and the received signal model are studied, where the problem is converted into a sparse estimation problem. Secondly, Fast Fourier Transform(FFT) is utilized to precisely estimate the doppler shift and the channel gain of each path. Thirdly, rough and accurate searches are applied to get a precise estimation of the doppler shift and time delay. With the proposed scheme, the estimation complexity is reduced, and the prior knowledge for more precise DD domain pilot design and channel estimation could be acquired.
正交时频空间(OTFS)调制是最近提出的一种调制方式,旨在克服高移动场景中的问题。参数学习是OTFS最重要的研究方向之一,包括时延多普勒(DD)域和时频(TF)域学习。粗糙参数学习在TF域是首选的,因为它的成本较低。本文提出了一种单输入单输出OTFS (SISO-OTFS)场景的时频域参数学习方案。首先,研究了二维上行信道模型和接收信号模型,将该问题转化为稀疏估计问题;其次,利用快速傅立叶变换(FFT)精确估计各信道的多普勒频移和信道增益;第三,采用粗糙和精确的搜索,得到了多普勒频移和时延的精确估计。该方案不仅降低了估计复杂度,而且为更精确的DD域导频设计和信道估计提供了先验知识。
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引用次数: 0
Research on the Internet of Things Technology Applied in the Construction of Smart City 物联网技术在智慧城市建设中的应用研究
Yongtang Wu
In the era of big data, the level of IoT technology is improving and gradually being used in various fields, including the construction of smart cities. China's smart city construction has entered a new stage, and the application of new generation information technology such as Internet of Things, cloud computing, and Internet is affecting the construction of smart city all the time, however, the application of Internet of Things is uneven. This article firstly elaborates the construction significance and construction target of smart city, and then analyzes how to integrate and apply IoT technology to it. And this paper gets the hierarchical relationship of different influencing factors by Boolean rules, and comes up with seven key factors: policy support, low standardization, insufficient network security guarantee capability, operation and operation insufficient maintenance capability, single investment and financing channel, insufficient publicity and depth, and urban planning, among which, organization, policy and technology are the core elements, which influence the development of other elements. Finally, this paper points out the next development direction of smart cities, aiming to be able to provide valuable reference for related fields in this way.
在大数据时代,物联网技术水平不断提高,并逐步应用于包括智慧城市建设在内的各个领域。中国的智慧城市建设进入了一个新的阶段,物联网、云计算、互联网等新一代信息技术的应用无时无刻不在影响着智慧城市的建设,但物联网的应用却参差不齐。本文首先阐述了智慧城市的建设意义和建设目标,然后分析了如何将物联网技术融入和应用于智慧城市。利用布尔规则得到了不同影响因素的层次关系,得出了7个关键因素:政策支持、标准化程度低、网络安全保障能力不足、运维能力不足、投融资渠道单一、宣传深度不足、城市规划等,其中组织、政策、技术是核心要素,影响着其他要素的发展。最后,本文指出了智慧城市下一步的发展方向,以期能够为相关领域提供有价值的参考。
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引用次数: 0
Rate Optimization and Interference Suppression in RIS-assisted MIMO Systems ris辅助MIMO系统的速率优化与干扰抑制
Junwei Chai, Yunhui Yi, Xiandeng He, Zicheng Xing, Yuanxinyu Luo, Xingcai Zhang
Abstract—Since the beginning of the modern era of wireless communication, the propagation medium has been considered a randomly behaving entity between transmitter and receiver, which degrades the quality of the received signal due to the uncontrollable interaction between the transmitted radio waves and the propagation medium. In 5G systems, in order to obtain higher spectrum efficiency, multiple-input multiple-output (MIMO) is introduced. When MIMO is applied in a multi-cell scenario, inter-cell interference will inevitably deteriorate the quality of service (QoS) of cell edge users. For a cell-edge user that suffers both high signal attenuation from its serving Base Station(BS) and severe co-channel interference from a neighboring BS, an Reconfigurable intelligent surfaces (RIS) can be deployed at the cell edge to help not only improve the desired signal power but also suppress the interference by properly designing its reflect beamforming, thus creating a “signal hotspot” as well as “interference-free zone” in its vicinity. The presence of RIS provides the possibility for different communication needs between multiple devices. This paper proposes a multi-objective optimization method based on non-dominated sorting genetic algorithm II(NSGAII) to improve the achievable rate of communication users while reducing interference to non-communication users.
摘要:自现代无线通信时代开始以来,传播介质一直被认为是发射器和接收器之间的随机行为实体,由于发射的无线电波与传播介质之间的不可控相互作用,导致接收信号的质量下降。在5G系统中,为了获得更高的频谱效率,引入了多输入多输出(MIMO)技术。当MIMO应用于多小区场景时,小区间干扰不可避免地会降低小区边缘用户的服务质量(QoS)。对于受到服务基站(BS)的高信号衰减和来自相邻基站的严重同信道干扰的蜂窝边缘用户,可以在蜂窝边缘部署可重构智能表面(RIS),不仅可以帮助提高期望的信号功率,还可以通过适当设计其反射波束形成来抑制干扰,从而在其附近创建“信号热点”和“无干扰区”。RIS的存在为多个设备之间的不同通信需求提供了可能。本文提出了一种基于非支配排序遗传算法II(NSGAII)的多目标优化方法,以提高通信用户的可达率,同时减少对非通信用户的干扰。
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引用次数: 0
Automatic Gain Control of Wireless Receiver Based on Q-Learning 基于q -学习的无线接收机自动增益控制
Shuo Yang, Yunhui Yi, Xiandeng He, Junwei Chai
Abstract—In the wireless communication system, due to the complexity of the physical channel, the amplitude of the signal received by the wireless receiver often fluctuates wildly, which will increase the bit error rate of signal demodulation. Therefore, the automatic gain control (AGC) is an essential part of the wireless receiver, which can adaptively adjust the gain of each part of the receiver and provide a stable input for the subsequent circuit. Artificial intelligence technology has developed, and reinforcement learning in signal processing has received extensive attention. This paper proposes a gain automatic control method based on Q-learning in the zero-IF receiver, which uses the Q-learning model to learn the characteristics of signal amplitude changes to adjust the speed of the gain adjustment and to track the signal changes more accurately. The simulation results show that the AGC proposed in this paper is more stable than the traditional AGC without Q-learning and can quickly compensate for significant changes in Orthogonal Frequency Division Multiplexing (OFDM) signals.
摘要在无线通信系统中,由于物理信道的复杂性,无线接收机接收到的信号幅度往往波动较大,这将增加信号解调的误码率。因此,自动增益控制(AGC)是无线接收机必不可少的组成部分,它可以自适应地调节接收机各部分的增益,为后续电路提供稳定的输入。随着人工智能技术的发展,信号处理中的强化学习受到了广泛的关注。本文提出了一种基于q -学习的零中频接收机增益自动控制方法,该方法利用q -学习模型学习信号幅值变化的特性来调整增益调节的速度,从而更准确地跟踪信号的变化。仿真结果表明,本文提出的AGC比传统的无q学习的AGC更稳定,可以快速补偿正交频分复用(OFDM)信号的显著变化。
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引用次数: 0
Design of border security system based on ultrasonic technology and video linkage 基于超声技术和视频联动的边境安防系统设计
Youcheng Liang
An intelligent border system measurement scheme based on ultrasonic sensing technology is designed in this paper. The measurement scheme is composed of the sensing detection module and the data processing module, where the main sensing detection module is the outdoor sensor probe, which is mainly composed of the network controller, the network management module, the sensor and the sensor interface. The system measurement scheme mainly uses ultrasonic sensors and intelligent video for comprehensive perception of the perimeter area. Signal detection is completed through signal acquisition, analysis and processing of the detection area, and then through computer data processing, through intrusion positioning, so as to realize the all-weather intelligent monitoring of the perimeter area. CCS CONCEPTS •Computer systems organization ∼ Embedded and cyber-physical systems ∼ Sensor networks Key words—Ultrasonic, Sensing technology, Border System
本文设计了一种基于超声传感技术的智能边沿系统测量方案。该测量方案由传感检测模块和数据处理模块组成,其中传感检测模块主要为户外传感器探头,主要由网络控制器、网络管理模块、传感器和传感器接口组成。系统测量方案主要采用超声波传感器和智能视频对周边区域进行综合感知。信号检测是通过对检测区域的信号采集、分析和处理,再通过计算机数据处理,通过入侵定位来完成,从而实现对周界区域的全天候智能监控。CCS概念•计算机系统组织~嵌入式和网络物理系统~传感器网络关键词:超声波,传感技术,边界系统
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引用次数: 0
Sparse Channel Estimation for IRS-Assisted Communication System Based on Denoising Autoencoder 基于去噪自编码器的irs辅助通信系统稀疏信道估计
Yuanxinyu Luo, Yunhui Yi, Xiandeng He, Jiahui Hao
Intelligent reflective surface (IRS) technology, as a promising technology, can enhance the communication quality of traditional communication systems. It is very necessary to design an effective channel estimation scheme, which is the basis for IRS to adjust the amplitude and phase of the incident signal. In this paper, the denoising autoencoder (DAE) is used to solve the channel estimation problem of IRS-assisted uplink millimeter wave channel from the user to the base station (BS). The two-stage channel model of user-IRS-BS can not be directly processed by deep learning networks. Therefore, in the channel modeling part, the original channel is unified into a cascaded channel, and the problem of channel estimation is transformed into the problem of restoring undersampled signals. In the part of network model training, an end-to-end channel estimation scheme based on stacked DAE is proposed. A group of orthogonal pilot signals received by BS is the input, and the channel state information (CSI) is the output. When the normalized mean square error of the output CSI and the original CSI is minimum,the training ends and the weight matrix model including the data hiding relationship is trained. In this paper, the training and verification of the channel estimation scheme is completed based on the self-simulated channel model data set. Simulation and performance evaluation show that our scheme is superior to several traditional schemes and a classical scheme based on deep learning, which confirms its superiority.
智能反射面技术可以提高传统通信系统的通信质量,是一种很有前途的技术。设计一种有效的信道估计方案是IRS对入射信号进行幅度和相位调整的基础。本文采用去噪自编码器(DAE)来解决用户到基站的irs辅助上行毫米波信道估计问题。用户- irs - bs的两阶段通道模型不能被深度学习网络直接处理。因此,在信道建模部分,将原始信道统一为级联信道,将信道估计问题转化为欠采样信号的恢复问题。在网络模型训练部分,提出了一种基于堆叠DAE的端到端信道估计方案。BS接收到的一组正交导频信号为输入,信道状态信息(CSI)为输出。当输出CSI与原始CSI的归一化均方误差最小时,训练结束,训练包含数据隐藏关系的权重矩阵模型。本文在自模拟信道模型数据集的基础上,完成了信道估计方案的训练和验证。仿真和性能评估表明,该方案优于几种传统方案和基于深度学习的经典方案,证实了该方案的优越性。
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引用次数: 0
Short-Text Semantic Similarity Model of BERT-Based Siamese Network 基于bert的Siamese网络短文本语义相似度模型
Haoyu Jiang
People convey their emotions and thoughts through words, the medium of human thoughts. Up against the vigorous development of streaming media, the calculation of text similarity is imperative in the field of natural language processing. Any text-related field is inseparable from text semantic similarity. The calculation of text semantic similarity plays a key role in document management, document classification, and document relevance. Besides, popular natural language processing tasks in some trendy fields, such as artificial intelligence, human-machine translation, problem system, intelligent chat system, and nomenclature recognition, are intertwined with text semantic similarity calculation. In recent years, many excellent researchers have studied the algorithms and models of text semantic similarity from different dimensions. In this paper, a new short-text cosine similarity calculation model of the BERT-based Siamese network is proposed.
人们通过语言——人类思想的媒介——来表达自己的情感和思想。随着流媒体的蓬勃发展,文本相似度的计算在自然语言处理领域中势在必行。任何与文本相关的字段都离不开文本语义相似度。文本语义相似度的计算在文档管理、文档分类和文档关联中起着关键作用。此外,在人工智能、人机翻译、问题系统、智能聊天系统、命名法识别等一些新兴领域,流行的自然语言处理任务都与文本语义相似度计算交织在一起。近年来,许多优秀的研究者从不同的维度研究了文本语义相似度的算法和模型。本文提出了一种新的基于bert的Siamese网络的短文本余弦相似度计算模型。
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引用次数: 0
Optimizing the Number and Size of Signature Cells in a Modulated Sensor System 调制传感器系统中特征单元数量和大小的优化
A. Olteanu
The localization and tracking capabilities of binary sensors can be significantly enhanced by associating sensor nodes with modulators. The addition of modulators segments the detection area into subregions, called signature cells. While much of the related research focuses on modulator design and sensor data processing, there are few studies on the optimum number of cells, especially when considering small area cells with small area variances. This paper studies the optimum number of cells for varying numbers of per-sensor modulators under a placement scenario that produces signature cells with small area variances. We first derive the optimum number of signature cells and find necessary and sufficient conditions under which the maximum is achieved. We then focus on the sensors’ spatial awareness and deduct the conditions under which maximal spatial awareness is achieved. Finally, we study the asymptotic behavior of the individual cells’ areas in terms of the number of modulators. Our study can guide researchers in enhancing the tracking and localization precision of applications and improve the spatial awareness of sensors.
通过将传感器节点与调制器相关联,可以显著提高二元传感器的定位和跟踪能力。调制器的加入将检测区域分割成子区域,称为特征细胞。虽然许多相关研究集中在调制器设计和传感器数据处理上,但很少有关于最佳细胞数的研究,特别是在考虑小面积细胞和小面积方差的情况下。本文研究了在产生具有小面积差异的特征单元的放置场景下,不同数量的每传感器调制器的最佳单元数。我们首先推导了签名单元的最优数量,并找到了达到最大值的充分必要条件。然后,我们重点研究了传感器的空间感知,并推导了实现最大空间感知的条件。最后,我们根据调制器的数量研究了单个细胞面积的渐近行为。本研究可以指导研究人员提高应用的跟踪和定位精度,提高传感器的空间感知能力。
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引用次数: 0
Sequential Single Voting for Cooperative Spectrum Sensing Against Byzantine Attack 针对拜占庭攻击的协同频谱感知顺序单投票
Jun Wu, Zehao Chen, Haoyu Liang, Zehao Chen, Jia Zhang, Jipeng Gan, Jian-Duo He
Cooperative spectrum sensing (CSS) has been a crucial function of cognitive radio (CR) technology to identify the unused spectrum for growing wireless devices and applications. Nevertheless, the openness of CSS paradigm results in that the CR network suffers from Byzantine attack, thereby significantly degrading the CSS performance. To mitigate the adverse effect of Byzantine attack, we conduct out a Byzantine attack model from malicious perspective. Considering that Byzantine attack can make the fusion center (FC) blind, we propose a sequential single voting (SSV) rule to implement the sensing information fusion for CSS. To this aim, a trust value (Trv) mechanism based on interactive evaluation is formulated to measure the reliability of sensing information from secondary users (SUs). Moreover, a pair of tolerance threshold is also taken into account to suppress Byzantine attack, with aiming to make selectively use of sensing information from malicious users (MUs). Meanwhile, we are motivated by the single sign and sequential idea to further enhance the CSS efficiency. In contrast to the existing voting rules, simulation results show that the proposed SSV requires less fewer samples to provide with a better accuracy, especially in the presence of Byzantine attack.
协同频谱感知(CSS)是认知无线电(CR)技术的一个重要功能,它可以为不断增长的无线设备和应用识别未使用的频谱。然而,CSS范式的开放性导致CR网络遭受拜占庭式攻击,从而大大降低了CSS的性能。为了减轻拜占庭攻击的不利影响,我们从恶意的角度进行了拜占庭攻击模型。考虑到拜占庭攻击会导致融合中心(FC)失明,提出了一种顺序单投票(SSV)规则来实现CSS的感知信息融合。为此,提出了一种基于交互评价的信任值(Trv)机制,用于度量二级用户感知信息的可靠性。此外,还考虑了一对容忍阈值来抑制拜占庭攻击,目的是有选择地利用来自恶意用户(MUs)的感知信息。同时,我们受到单符号和顺序思想的激励,进一步提高CSS的效率。与现有的投票规则相比,仿真结果表明,所提出的SSV需要更少的样本来提供更好的准确性,特别是在存在拜占庭攻击的情况下。
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引用次数: 0
Research on Multi-network Data Paths for 5G Mobile Multimedia 5G移动多媒体多网络数据路径研究
Wenwen Fan
With the development of mobile network technology, 5G mobile multimedia has greatly increased the application and popularity of mobile networks. In particular, the emergence of video, shopping and numerous mobile applications has facilitated the development of 5G mobile multimedia. At the same time, network users continue to pursue a better user experience and put forward better requirements for mobile network communications. 5G mobile communication networks have emerged to meet the needs of users and are an inevitable result and trend in the development of mobile communication networks. This paper introduces the definition of 5G network and multimedia technology, and provides a detailed introduction to multimedia technology, then introduces the multi-network data path of 5G multimedia, focusing on the exploration of the multi-network data path of 5G multimedia, reflecting the great impact of 5G technology on the development of science and technology. Explore the multi-network data path of 5G mobile multimedia for an effective path to seek a better development space.
随着移动网络技术的发展,5G移动多媒体极大地提高了移动网络的应用和普及程度。特别是视频、购物和众多移动应用的出现,促进了5G移动多媒体的发展。同时,网络用户不断追求更好的用户体验,对移动网络通信提出了更好的要求。5G移动通信网络的出现是为了满足用户的需求,是移动通信网络发展的必然结果和趋势。本文首先介绍了5G网络和多媒体技术的定义,并对多媒体技术进行了详细的介绍,然后介绍了5G多媒体的多网数据路径,重点探讨了5G多媒体的多网数据路径,体现了5G技术对科技发展的巨大影响。探索5G移动多媒体的多网数据路径为一条有效路径,寻求更好的发展空间。
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引用次数: 0
期刊
Proceedings of the 2023 10th International Conference on Wireless Communication and Sensor Networks
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