Pub Date : 2018-01-01DOI: 10.12677/HJWC.2018.81003
曹 天旸
{"title":"Design and Performance Analysis of Omnidirectional Space-Time Block Code in Massive MIMO Systems","authors":"曹 天旸","doi":"10.12677/HJWC.2018.81003","DOIUrl":"https://doi.org/10.12677/HJWC.2018.81003","url":null,"abstract":"","PeriodicalId":66606,"journal":{"name":"无线通信","volume":"08 1","pages":"18-36"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66090782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.12677/HJWC.2018.82009
郭 涛涛
{"title":"A Wideband Digital Array Beamforming Method of Conformal Array Antenna Based on Digital Filters","authors":"郭 涛涛","doi":"10.12677/HJWC.2018.82009","DOIUrl":"https://doi.org/10.12677/HJWC.2018.82009","url":null,"abstract":"","PeriodicalId":66606,"journal":{"name":"无线通信","volume":"08 1","pages":"80-85"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66091347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.12677/HJWC.2018.84023
胡 志明
{"title":"Joint Optimal Power Allocation and Pre-Coding Design in MU-MIMO Network","authors":"胡 志明","doi":"10.12677/HJWC.2018.84023","DOIUrl":"https://doi.org/10.12677/HJWC.2018.84023","url":null,"abstract":"","PeriodicalId":66606,"journal":{"name":"无线通信","volume":"08 1","pages":"198-208"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66091808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-15DOI: 10.12677/HJWC.2017.75021
林斌, 刘泽泰, 张颖, 沈少东, 魏昕煜, 郑萍, 张培涛
本文针对移动通信系统、射频识别系统、超宽带系统、移动数字电视系统对天线的性能要求，创造性的将蝶形仿生天线与希尔伯特分形阵列相结合，设计了一款高兼容性分形阵列仿生天线，制作了天线样品并测试了天线的辐射特性。测试结果表明，该款天线完全覆盖了第二代至第五代移动通信所有工作频段、射频识别系统频段、超宽带系统频段和移动数字电视系统频段。使用该天线的智能终端将兼具手机通信、射频卡读写、超宽带传输和移动数字电视等多种功能，该天线有较大的应用潜力。 According to the requirements of the mobile communication system, radio frequency identifica-tion system, ultra wideband system and the mobile digital TV system to the antenna’s perfor-mance, the present paper originally combined butterfly shaped bionic antenna and Hilbert fractal array, designed a high compatibility fractal array bionic antenna, fabricated the antenna sample and tested the radiation characteristics of the antenna. The result of test indicate that this antenna completely covered all working frequency bands of the second generation to the fifth generation mobile communication, the frequency bands of the radio frequency identification system, the frequency band of ultra wideband system, and the frequency band of the mobile digital TV system. The smart terminal using this antenna will have many functions, such as mobile communication, radio frequency card read and write, ultra wideband transmission, mobile digital TV and so on, and this antenna has great potential for application.
This article creatively combines butterfly shaped biomimetic antennas with Hilbert fractal arrays to meet the performance requirements of antennas in mobile communication systems, radio frequency identification systems, ultra wideband systems, and mobile digital television systems. A highly compatible fractal array biomimetic antenna is designed, and antenna samples are produced and the radiation characteristics of the antenna are tested. The test results show that this antenna fully covers all operating frequency bands of the second to fifth generation mobile communication, radio frequency identification system, ultra wideband system, and mobile digital television system. The smart terminal using this antenna will have multiple functions such as mobile communication, RF card reading and writing, ultra wideband transmission, and mobile digital television, and this antenna has great application potential. According to the requirements of the mobile communication system, radio frequency identification system, ultra wideband system and the mobile digital TV system to the antenna's for performance, the present paper originally combined butterfly shaped biological antenna and Hilbert fractal array, designed a high compatibility fractal array biological antenna, Fabricated the antenna sample and tested the radiation characteristics of the antenna The result of test indicates that this antenna fully covered all working frequency bands of the second generation to the fifth generation mobile communication, the frequency bands of the radio frequency identification system, the frequency band of ultra wideband system, and the frequency band of the mobile digital TV system The smart terminal using this antenna will have many functions, such as mobile communication, radio frequency card read and write, ultra wideband transmission, mobile digital TV and so on, and this antenna has great potential for application
{"title":"高兼容性分形阵列仿生天线设计 Design of the High Compatibility Fractal Array Bionic Antenna","authors":"林斌, 刘泽泰, 张颖, 沈少东, 魏昕煜, 郑萍, 张培涛","doi":"10.12677/HJWC.2017.75021","DOIUrl":"https://doi.org/10.12677/HJWC.2017.75021","url":null,"abstract":"本文针对移动通信系统、射频识别系统、超宽带系统、移动数字电视系统对天线的性能要求，创造性的将蝶形仿生天线与希尔伯特分形阵列相结合，设计了一款高兼容性分形阵列仿生天线，制作了天线样品并测试了天线的辐射特性。测试结果表明，该款天线完全覆盖了第二代至第五代移动通信所有工作频段、射频识别系统频段、超宽带系统频段和移动数字电视系统频段。使用该天线的智能终端将兼具手机通信、射频卡读写、超宽带传输和移动数字电视等多种功能，该天线有较大的应用潜力。 According to the requirements of the mobile communication system, radio frequency identifica-tion system, ultra wideband system and the mobile digital TV system to the antenna’s perfor-mance, the present paper originally combined butterfly shaped bionic antenna and Hilbert fractal array, designed a high compatibility fractal array bionic antenna, fabricated the antenna sample and tested the radiation characteristics of the antenna. The result of test indicate that this antenna completely covered all working frequency bands of the second generation to the fifth generation mobile communication, the frequency bands of the radio frequency identification system, the frequency band of ultra wideband system, and the frequency band of the mobile digital TV system. The smart terminal using this antenna will have many functions, such as mobile communication, radio frequency card read and write, ultra wideband transmission, mobile digital TV and so on, and this antenna has great potential for application.","PeriodicalId":66606,"journal":{"name":"无线通信","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47070064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-15DOI: 10.12677/HJWC.2017.75020
白莎, 李静文, 崔小帅, 李印, 高俊博
论文介绍了一种基于H.264编码视频的网络传输跟踪评价方法。首先概述H.264视频编码；然后介绍了捕捉H.264编码视频特点的跟踪结构，给出一种典型的视频流量和H.264编码视频的质量特征；最后，解释了H.264特定编码机制，如分层B帧。 This tutorial introduces a trace-based evaluation methodology for the network transport of H.264 encoded video. We first give an overview of H.264 video coding, and then present the trace structures for capturing the characteristics of H.264 encoded video. We give an overview of the typical video traffic and quality characteristics of H.264 encoded video. Finally, we explain how to account for the H.264 specific coding mechanisms, such as hierarchical B frames.
The paper introduces a network transmission tracking evaluation method based on H.264 encoded video. Firstly, provide an overview of H.264 video encoding; Then, the tracking structure for capturing the characteristics of H.264 encoded video was introduced, and a typical video traffic and quality characteristics of H.264 encoded video were given; Finally, the specific encoding mechanism of H.264, such as layered B-frames, was explained. This tutorial introduces a trace based evaluation methodology for the network transport of H.264 encoded video We first gave an overview of H.264 video coding, and then presented the trace structures for capturing the characteristics of H.264 encoded video We give an overview of the typical video traffic and quality characteristics of H.264 encoded video Finally, we explain how to account for the H.264 specific coding mechanisms, such as hierarchical B frames
{"title":"支持H.264视频跟踪的视频传输评价 Video Transport Evaluation with H.264 Video Traces","authors":"白莎, 李静文, 崔小帅, 李印, 高俊博","doi":"10.12677/HJWC.2017.75020","DOIUrl":"https://doi.org/10.12677/HJWC.2017.75020","url":null,"abstract":"论文介绍了一种基于H.264编码视频的网络传输跟踪评价方法。首先概述H.264视频编码；然后介绍了捕捉H.264编码视频特点的跟踪结构，给出一种典型的视频流量和H.264编码视频的质量特征；最后，解释了H.264特定编码机制，如分层B帧。 This tutorial introduces a trace-based evaluation methodology for the network transport of H.264 encoded video. We first give an overview of H.264 video coding, and then present the trace structures for capturing the characteristics of H.264 encoded video. We give an overview of the typical video traffic and quality characteristics of H.264 encoded video. Finally, we explain how to account for the H.264 specific coding mechanisms, such as hierarchical B frames.","PeriodicalId":66606,"journal":{"name":"无线通信","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48038806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-15DOI: 10.12677/HJWC.2017.75019
冯婉媚
多输入多输出(MIMO)技术在很大程度上提升无线网络的传输可靠性与频谱利用率。异构Ad Hoc网络中的节点不需要有线连接就能够直接通信，从而弥补了固定网络基础设施通信的缺陷。因此，异构Ad Hoc网络结合MIMO技术成为了学术界的一个研究热点。然而，在基于MIMO异构Ad Hoc网络中，不同的发送–接收对之间是通过不同的链路传输数据流，而链路与链路之间会存在共信道干扰的现象。好的节点调度方法对减少链路之间的干扰起很重要的作用。针对异构Ad Hoc网络传输链路特点，本文提出的分布式节点调度优化方法，根据每一条链路与其他链路之间的竞争情况，得到每一条链路的资源分配(rate)。在进行节点调度的过程中，根据不同链路的rate值，发送节点可以选择最优的接受节点传输数据流。实验仿真结果表示，分布式节点调度优化算法能够明显减少共信道干扰现象，从而提升系统的吞吐量。 Multiple-input and multiple-output (MIMO) can obviously improve transmission reliability and bandwidth efficiency in wireless networks. The nodes in heterogeneous Ad Hoc networks enable to communicate directly without wired connections, making up the lack of communication with fixed network infrastructures. Therefore, heterogeneous Ad Hoc networks combined with MIMO techniques becomes one of the research hotspots in academia. However, in heterogeneous Ad Hoc networks based on MIMO, different transmitter-receiver pairs transmit data streams by different links which have the effect of co-channel interference. A good scheduling algorithm plays an important part in reducing the co-channel interference. According to the characteristics of heterogeneous Ad Hoc networks and the contention regions between links, we propose node scheduling optimization algorithm to obtain resource allocation (rate). Based on different rate of different links, transmitters can choose the optimum receivers to transmit data streams via node scheduling. The results of the experience proof that node scheduling optimization algorithm can highly improve the system throughput with reducing the effect of co-channel interference.
多输入多输出(MIMO)技术在很大程度上提升无线网络的传输可靠性与频谱利用率。异构Ad Hoc网络中的节点不需要有线连接就能够直接通信，从而弥补了固定网络基础设施通信的缺陷。因此，异构Ad Hoc网络结合MIMO技术成为了学术界的一个研究热点。然而，在基于MIMO异构Ad Hoc网络中，不同的发送–接收对之间是通过不同的链路传输数据流，而链路与链路之间会存在共信道干扰的现象。好的节点调度方法对减少链路之间的干扰起很重要的作用。针对异构Ad Hoc网络传输链路特点，本文提出的分布式节点调度优化方法，根据每一条链路与其他链路之间的竞争情况，得到每一条链路的资源分配(rate)。在进行节点调度的过程中，根据不同链路的rate值，发送节点可以选择最优的接受节点传输数据流。实验仿真结果表示，分布式节点调度优化算法能够明显减少共信道干扰现象，从而提升系统的吞吐量。 Multiple-input and multiple-output (MIMO) can obviously improve transmission reliability and bandwidth efficiency in wireless networks. The nodes in heterogeneous Ad Hoc networks enable to communicate directly without wired connections, making up the lack of communication with fixed network infrastructures. Therefore, heterogeneous Ad Hoc networks combined with MIMO techniques becomes one of the research hotspots in academia. However, in heterogeneous Ad Hoc networks based on MIMO, different transmitter-receiver pairs transmit data streams by different links which have the effect of co-channel interference. A good scheduling algorithm plays an important part in reducing the co-channel interference. According to the characteristics of heterogeneous Ad Hoc networks and the contention regions between links, we propose node scheduling optimization algorithm to obtain resource allocation (rate). Based on different rate of different links, transmitters can choose the optimum receivers to transmit data streams via node scheduling. The results of the experience proof that node scheduling optimization algorithm can highly improve the system throughput with reducing the effect of co-channel interference.
{"title":"基于MIMO异构Ad Hoc网络节点调度优化算法 Node Scheduling Optimization Algorithm in Heterogeneous Ad Hoc Networks Based on MIMO","authors":"冯婉媚","doi":"10.12677/HJWC.2017.75019","DOIUrl":"https://doi.org/10.12677/HJWC.2017.75019","url":null,"abstract":"多输入多输出(MIMO)技术在很大程度上提升无线网络的传输可靠性与频谱利用率。异构Ad Hoc网络中的节点不需要有线连接就能够直接通信，从而弥补了固定网络基础设施通信的缺陷。因此，异构Ad Hoc网络结合MIMO技术成为了学术界的一个研究热点。然而，在基于MIMO异构Ad Hoc网络中，不同的发送–接收对之间是通过不同的链路传输数据流，而链路与链路之间会存在共信道干扰的现象。好的节点调度方法对减少链路之间的干扰起很重要的作用。针对异构Ad Hoc网络传输链路特点，本文提出的分布式节点调度优化方法，根据每一条链路与其他链路之间的竞争情况，得到每一条链路的资源分配(rate)。在进行节点调度的过程中，根据不同链路的rate值，发送节点可以选择最优的接受节点传输数据流。实验仿真结果表示，分布式节点调度优化算法能够明显减少共信道干扰现象，从而提升系统的吞吐量。 Multiple-input and multiple-output (MIMO) can obviously improve transmission reliability and bandwidth efficiency in wireless networks. The nodes in heterogeneous Ad Hoc networks enable to communicate directly without wired connections, making up the lack of communication with fixed network infrastructures. Therefore, heterogeneous Ad Hoc networks combined with MIMO techniques becomes one of the research hotspots in academia. However, in heterogeneous Ad Hoc networks based on MIMO, different transmitter-receiver pairs transmit data streams by different links which have the effect of co-channel interference. A good scheduling algorithm plays an important part in reducing the co-channel interference. According to the characteristics of heterogeneous Ad Hoc networks and the contention regions between links, we propose node scheduling optimization algorithm to obtain resource allocation (rate). Based on different rate of different links, transmitters can choose the optimum receivers to transmit data streams via node scheduling. The results of the experience proof that node scheduling optimization algorithm can highly improve the system throughput with reducing the effect of co-channel interference.","PeriodicalId":66606,"journal":{"name":"无线通信","volume":"07 1","pages":"155-162"},"PeriodicalIF":0.0,"publicationDate":"2017-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42341297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-08DOI: 10.12677/HJWC.2017.74017
方媛, 陈俊, 沈骜, 沈金虎
测量报告来源于所有使用业务的真实用户终端，具有数据来源成本低、真实全面的特点，已被广泛应用于实际网络优化中。本文利用真实网络数据，评估了测量报告功能开启前后对于基站设备和网络关键性能指标的影响，通过对比分析我们得出结论：在不开启异频测量的情况下，测量报告功能开启不会对网络性能产生大幅影响。 Because of the characteristics of low cost and real data, the measurement report has been applied to the actual network optimization widely. In this paper, we evaluate the influence of base station equipment and network key performance indicators by enablement of measurement report function in real network. Through comparative analysis, we conclude that measurement report function is not expected to produce great influence on the performance of the network without differ-frequency measurement.
测量报告来源于所有使用业务的真实用户终端，具有数据来源成本低、真实全面的特点，已被广泛应用于实际网络优化中。本文利用真实网络数据，评估了测量报告功能开启前后对于基站设备和网络关键性能指标的影响，通过对比分析我们得出结论：在不开启异频测量的情况下，测量报告功能开启不会对网络性能产生大幅影响。 Because of the characteristics of low cost and real data, the measurement report has been applied to the actual network optimization widely. In this paper, we evaluate the influence of base station equipment and network key performance indicators by enablement of measurement report function in real network. Through comparative analysis, we conclude that measurement report function is not expected to produce great influence on the performance of the network without differ-frequency measurement.
{"title":"LTE测量报告开启对网络性能的影响分析 Impact Analysis of the Measurement Report on the Network Performance of LTE","authors":"方媛, 陈俊, 沈骜, 沈金虎","doi":"10.12677/HJWC.2017.74017","DOIUrl":"https://doi.org/10.12677/HJWC.2017.74017","url":null,"abstract":"测量报告来源于所有使用业务的真实用户终端，具有数据来源成本低、真实全面的特点，已被广泛应用于实际网络优化中。本文利用真实网络数据，评估了测量报告功能开启前后对于基站设备和网络关键性能指标的影响，通过对比分析我们得出结论：在不开启异频测量的情况下，测量报告功能开启不会对网络性能产生大幅影响。 Because of the characteristics of low cost and real data, the measurement report has been applied to the actual network optimization widely. In this paper, we evaluate the influence of base station equipment and network key performance indicators by enablement of measurement report function in real network. Through comparative analysis, we conclude that measurement report function is not expected to produce great influence on the performance of the network without differ-frequency measurement.","PeriodicalId":66606,"journal":{"name":"无线通信","volume":"07 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66090608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-08DOI: 10.12677/HJWC.2017.74018
陆招兰, 谢怀文
由STC89C52单片机采集信息和智能控制，利用GPRS无线传输模块定时把温室大棚采集到的温度、湿度、光照强度以及CO2浓度等数据传输给上位机(PC机)，实时观察，同时又通过PC机对下位机(单片机)采集的信息进行分析，并发出相应指令给下位机作出相应的控制，如通风设备、喷淋装置、遮阳网等装置。 Greenhouses state parameters (such as temperature, humidity, light intensity and CO2 concentra-tion) which are collected and intelligently controlled by MCU (STC89C52) are transmitted to the host computer (PC) for real-time observation. By analyzing information provided by lower computer (MCU), PC orders STC89C52 to send control commands to ventilation equipment, spray device and Shade net.
由STC89C52单片机采集信息和智能控制，利用GPRS无线传输模块定时把温室大棚采集到的温度、湿度、光照强度以及CO2浓度等数据传输给上位机(PC机)，实时观察，同时又通过PC机对下位机(单片机)采集的信息进行分析，并发出相应指令给下位机作出相应的控制，如通风设备、喷淋装置、遮阳网等装置。 Greenhouses state parameters (such as temperature, humidity, light intensity and CO2 concentra-tion) which are collected and intelligently controlled by MCU (STC89C52) are transmitted to the host computer (PC) for real-time observation. By analyzing information provided by lower computer (MCU), PC orders STC89C52 to send control commands to ventilation equipment, spray device and Shade net.
{"title":"基于GPRS的温室大棚信息采集及控制 Greenhouses Information Collection and Control Based on GPRS","authors":"陆招兰, 谢怀文","doi":"10.12677/HJWC.2017.74018","DOIUrl":"https://doi.org/10.12677/HJWC.2017.74018","url":null,"abstract":"由STC89C52单片机采集信息和智能控制，利用GPRS无线传输模块定时把温室大棚采集到的温度、湿度、光照强度以及CO2浓度等数据传输给上位机(PC机)，实时观察，同时又通过PC机对下位机(单片机)采集的信息进行分析，并发出相应指令给下位机作出相应的控制，如通风设备、喷淋装置、遮阳网等装置。 Greenhouses state parameters (such as temperature, humidity, light intensity and CO2 concentra-tion) which are collected and intelligently controlled by MCU (STC89C52) are transmitted to the host computer (PC) for real-time observation. By analyzing information provided by lower computer (MCU), PC orders STC89C52 to send control commands to ventilation equipment, spray device and Shade net.","PeriodicalId":66606,"journal":{"name":"无线通信","volume":"07 1","pages":"144-154"},"PeriodicalIF":0.0,"publicationDate":"2017-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46478243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-08DOI: 10.12677/HJWC.2017.74016
付墨轩, 廖强
无线传感器网络是由大量具备感知、数据处理、存储和无线通信能力的传感器节点通过自组织方式形成的网络。针对无线传感器网络节点定位问题，以RSSI测距为基础，提出了一种最小二乘估计的节点定位算法。该算法不需要额外的硬件设备，能有效减小系统体积，降低节点能耗，而且能同时估计未知节点的位置和信道衰减因子，提高了环境适应性。 Wireless sensor networks are formed via self-organization by a large number of sensor nodes with sensing, data processing and store, wireless communication, which have become a vibrant and exciting research and development field. Based on the received signal strength indication (RSSI), a least squares localization algorithm is presented, which does not need the additional hardware equipments. Consequently, sensor nodes can be compact and energy cost will be reduced. The simulation results show that the algorithm can estimate the unknown nodes location and pathloss exponent simultaneously, and adapt to the variational environment.
无线传感器网络是由大量具备感知、数据处理、存储和无线通信能力的传感器节点通过自组织方式形成的网络。针对无线传感器网络节点定位问题，以RSSI测距为基础，提出了一种最小二乘估计的节点定位算法。该算法不需要额外的硬件设备，能有效减小系统体积，降低节点能耗，而且能同时估计未知节点的位置和信道衰减因子，提高了环境适应性。 Wireless sensor networks are formed via self-organization by a large number of sensor nodes with sensing, data processing and store, wireless communication, which have become a vibrant and exciting research and development field. Based on the received signal strength indication (RSSI), a least squares localization algorithm is presented, which does not need the additional hardware equipments. Consequently, sensor nodes can be compact and energy cost will be reduced. The simulation results show that the algorithm can estimate the unknown nodes location and pathloss exponent simultaneously, and adapt to the variational environment.
{"title":"基于RSSI的无线传感器网络节点定位算法研究 RSSI Based Node Localization Algorithm for Wireless Sensor Networks","authors":"付墨轩, 廖强","doi":"10.12677/HJWC.2017.74016","DOIUrl":"https://doi.org/10.12677/HJWC.2017.74016","url":null,"abstract":"无线传感器网络是由大量具备感知、数据处理、存储和无线通信能力的传感器节点通过自组织方式形成的网络。针对无线传感器网络节点定位问题，以RSSI测距为基础，提出了一种最小二乘估计的节点定位算法。该算法不需要额外的硬件设备，能有效减小系统体积，降低节点能耗，而且能同时估计未知节点的位置和信道衰减因子，提高了环境适应性。 Wireless sensor networks are formed via self-organization by a large number of sensor nodes with sensing, data processing and store, wireless communication, which have become a vibrant and exciting research and development field. Based on the received signal strength indication (RSSI), a least squares localization algorithm is presented, which does not need the additional hardware equipments. Consequently, sensor nodes can be compact and energy cost will be reduced. The simulation results show that the algorithm can estimate the unknown nodes location and pathloss exponent simultaneously, and adapt to the variational environment.","PeriodicalId":66606,"journal":{"name":"无线通信","volume":"07 1","pages":"129-136"},"PeriodicalIF":0.0,"publicationDate":"2017-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43450063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-06-19DOI: 10.12677/HJWC.2017.73015
周艳, 余小游, 孙鹏帅, 慈能达, 田丽佳, 林培英, 叶恒
高速移动环境下，由于多普勒频移增大，信道的时变性破坏了正交频分复用(Orthogonal Frequency Division Multiplexing, OFDM)系统子载波之间的正交性，从而产生子载波间干扰(Inter Carrier Interference, ICI)，导致系统性能严重下降。为了减少待估计量，通常采用基扩展模型(BEM)来近似模拟时变信道。为了提升性能，当信道的相干时间与发送码元的周期可相比拟的时候，本文采用多块(多个OFDM符号)。同时在使用导频符号对参数估计时，忽略了相邻非导频符号的ICI干扰，降低了整个时变信道下的估计准确性。因此我们通过分析子载波所产生的ICI系数变化特点，提出了一种带有ICI自消除的多OFDM符号时变信道估计方法，提高估计的准确性。但是由于基于多OFDM符号的信道估计性能在归一化多普勒频移较大时该方法成立条件不再满足，因此性能呈现明显的衰减，为了解决此问题，我们提出一种带有ICI自消除的自适应OFDM符号个数时变信道估计方法。仿真实验从误码率，归一化均方误差两方面分别验证了该方法的有效性。 In high-speed mobile environment, time-varying channel destroys the orthogonality between subcarriers of orthogonal frequency-division multiplexing (OFDM) systems, giving rise to in-ter-carrier interference (ICI), and degrading the performance of the systems. Basis expansion model (BEM) is usually used to approximate the time-varying channels to reduce the estimators. In order to improve performance, this paper adopts multi block (multiple OFDM symbols) when the coherent time of the channel variations and the symbols can be compared. However, when using pilot-symbol to parameter estimation, the ICI interference from near non-pilot-symbol is ignored, reducing its estimated accuracy of time-varying channel. And in this work the paper proposes a multiple OFDM symbols time-varying channel estimation method with ICI self-cancellation after analyzing the high correlation between subcarriers, improving the accuracy of estimation. But due to the condition of utilizing the multiple OFDM symbols channel estimation method is no longer met in large Doppler frequency shift, the performance of resulting channel estimation attenuates obviously. In order to solve this problem, we put forward a kind of adaptive OFDM symbol time-varying channel estimation method with the ICI self-cancellation. The simulation results show that the proposed method is effective from two aspects of error rate and normalized mean square error.
高速移动环境下，由于多普勒频移增大，信道的时变性破坏了正交频分复用(Orthogonal Frequency Division Multiplexing, OFDM)系统子载波之间的正交性，从而产生子载波间干扰(Inter Carrier Interference, ICI)，导致系统性能严重下降。为了减少待估计量，通常采用基扩展模型(BEM)来近似模拟时变信道。为了提升性能，当信道的相干时间与发送码元的周期可相比拟的时候，本文采用多块(多个OFDM符号)。同时在使用导频符号对参数估计时，忽略了相邻非导频符号的ICI干扰，降低了整个时变信道下的估计准确性。因此我们通过分析子载波所产生的ICI系数变化特点，提出了一种带有ICI自消除的多OFDM符号时变信道估计方法，提高估计的准确性。但是由于基于多OFDM符号的信道估计性能在归一化多普勒频移较大时该方法成立条件不再满足，因此性能呈现明显的衰减，为了解决此问题，我们提出一种带有ICI自消除的自适应OFDM符号个数时变信道估计方法。仿真实验从误码率，归一化均方误差两方面分别验证了该方法的有效性。 In high-speed mobile environment, time-varying channel destroys the orthogonality between subcarriers of orthogonal frequency-division multiplexing (OFDM) systems, giving rise to in-ter-carrier interference (ICI), and degrading the performance of the systems. Basis expansion model (BEM) is usually used to approximate the time-varying channels to reduce the estimators. In order to improve performance, this paper adopts multi block (multiple OFDM symbols) when the coherent time of the channel variations and the symbols can be compared. However, when using pilot-symbol to parameter estimation, the ICI interference from near non-pilot-symbol is ignored, reducing its estimated accuracy of time-varying channel. And in this work the paper proposes a multiple OFDM symbols time-varying channel estimation method with ICI self-cancellation after analyzing the high correlation between subcarriers, improving the accuracy of estimation. But due to the condition of utilizing the multiple OFDM symbols channel estimation method is no longer met in large Doppler frequency shift, the performance of resulting channel estimation attenuates obviously. In order to solve this problem, we put forward a kind of adaptive OFDM symbol time-varying channel estimation method with the ICI self-cancellation. The simulation results show that the proposed method is effective from two aspects of error rate and normalized mean square error.
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