Performance Analysis of UWB Systems over the IEEE 802.15.3a Channel Model

IEEE802.11a WLAN干扰环境下的UWB WBAN系统可靠性研究

（ＳｃｈｏｏｌｏｆＯｐｔｏ — ｅｌｅｃｔｒｏｎｉｃＩｎｆｏｒｍａｔｉｏｎＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙ，ＹａｎｔａｉＵｎｉｖｅｒｓｉｔｙ，ＹａｎｔａｉＳｈａｎｄ０ｎｇ２６４０２５，Ｃｈｉｎａ）
ＰＰＭＵＷＢＷＢＡＮ系统具有更好的抗干扰性能。
关键词：无线体域网；超宽带；无线局域网；干扰；误比特率中图分类号：ＴＰ３９３文献标志码：Ａ文章编号：１００２ — ０８０２（２０１７）一０６一ｌ１９３－０５
Ａｂｓｔｒａｃｔ：ＷＢＡＮ（Ｗｉｒｅｌｅｓｓｂｏｄｙａｒｅａｎｅｔｗｏｒｋ１ｈａｓｇｒｅａｔｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉｏｎｖａｌｕｅｉｎｔｈｅｆｉｅｌｄｏｆ
ｔｈｅＩＥＥＥ８０２．１ｌａＷＬＡＮｓｉｇｎａ１．Ｂａｓｅｄｏｎｅｘｉｓｔｉｎｇｔｉｍｅｈｏｐｐｉｎｇｐｕｌｓｅｐｏｓｉｔｉｏｎｍｏｄｕｌａｔｉｏｎ（ＴＨ— ＰＰＭ）ａｎｄ
通过误比特率仿真，对比分析了ＤＳ — ＰＡＭＵＷＢＷＢＡＮ系统与ＴＨ— ＰＰＭＵＷＢＷＢＡＮ系统在ＩＥＥＥ８０２．１ｌａＶＣＬＡＮ信号干扰环境下的可靠性。结果表明，Ｄｓ — ＰＡＭＵ－ＷＢＷＢＡＮ系统较ＴＨ—

移动IP的应用与移动互联网(马严教授,北京邮电大学)

IP header data IP header IP header data CERNET'2004
23
Roaming among Heterogeneous network
Local area High end Satellite
本地范围 Wide Area
Seamless mobility across diverse overlay networks
Some of the key technologies for the Next Generation Mobile Internet

High performance, hierarchical network Various new wireless technology L2/L3 Roaming technology QoS issue Security issue Mobile computation for commercial applications Migration from IPv4 to IPv6

11b/11a/11g PAN <10M Bluetooth
IEEE802.15

IEEE802.16

Large coverage
at High moving speed
CERNET'2004 11
IEEE802.20

Various terminals that supporting mobile computing
Application Transport Network Data Link Physical
Radio
CERNET'2004
18

用菲涅尔区模型探究WiFi感知系统的稳定性

用菲涅尔区模型探究WiFi 感知系统的稳定性牛凯1,2，张扶桑3，吴丹1,2，张大庆1,2+1.北京大学信息科学技术学院高可信软件技术教育部重点实验室，北京1008712.北京大学（天津滨海）新一代信息技术研究院，天津3004503.中国科学院软件研究所计算机科学国家重点实验室，北京100190+通信作者E-mail:*************** 摘要：基于WiFi 的非接触感知系统利用环境中广泛存在的WiFi 信号在自然情况下对用户活动进行感知，具有十分广阔的应用前景。

从细粒度活动到粗粒度活动，现有工作进行了大量的探索，但尚未理解和解决感知系统稳定性不足的问题。

当感知对象、收发设备位置、测试环境等发生变化时，系统性能会受到严重影响。

实际上，人体活动对应的接收信号模式因位置和朝向的变化而带来的不一致性导致了系统不能稳定工作。

为了理解这种现象的本质，利用团队提出的基于无线感知的菲涅尔区衍射和反射模型，精确定量刻画了目标物体相对于收发设备的位置、运动轨迹和无线信号波形模式之间的关系。

通过两个应用实例，即细粒度的手指动作识别和粗粒度的健身活动识别，在模型的指导下，分别解释了系统不能稳定工作的原因，说明了如何得到一致的感知波形，以及如何构造可区分的感知波形，并给出了提升感知系统性能的方法。

关键词：菲涅尔区模型；系统稳定性；WiFi ；无接触感知文献标志码：A中图分类号：TP399Exploring Stability in WiFi Sensing System Based on Fresnel Zone ModelNIU Kai 1,2,ZHANG Fusang 3,WU Dan 1,2,ZHANG Daqing 1,2+1.Key Laboratory of High Confidence Software Technologies,Ministry of Education,School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China2.Peking University Information Technology Institute (Tianjin Binhai),Tianjin 300450,China3.State Key Laboratory of Computer Sciences,Institute of Software,Chinese Academy of Sciences,Beijing 100190,China Abstract:WiFi based contactless sensing systems use pervasive wireless communication signals in the environment to sense human activities in a natural way,enabling many promising applications.From fine-grained activity sensing to coarse-grained activity recognition,existing work have done a great deal of exploration.However,there is lack of understanding and tackling the serious unstable sensing performance problem.While changing the human target,the position of transceivers,and test environment,the system performance is severely degraded.The reason behind the instability of WiFi-based sensing system is that human activities induce the inconsistent signal patterns inherently at different positions.This paper proposes the Fresnel zone-based diffraction and reflection sensing model,which can计算机科学与探索1673-9418/2021/15(01)-0060-13doi:10.3778/j.issn.1673-9418.1912017基金项目：国家自然科学基金（61572048，61802373）；北大百度基金资助项目（2019BD005）；中国科学院青年创新促进会项目（2020109）。

EE802154多时隙下GTS性能及配置优化

IEEE802． 15． 4 多时隙下 GTS 性能分析及配置优化
蔡惠娟，蒋文贤
*
( 华侨大学计算机科学与技术学院，福建厦门 361021) ( * 通信作者电子邮箱 jwx@ hqu． edu． cn)
摘要：IEEE802． 15． 4 标准的保障时隙（ GTS）机制可分配多个时隙，用于保障实时性数据的传输。针对非竞争接入期多时隙下 GTS 性能分析的不足，利用网络微积分法分析时延和吞吐量服务曲线及其与能耗的关系，改进 IEEE802． 15． 4 传感器节点模型，建模仿真研究 GTS 参数对网络性能（时延、吞吐量及能耗）的影响。仿真结果表明：根据高低突发性数据率的情况，最优化配置下的 GTS 可以满足实时性数据的传输。关键词：无线传感器网络； IEEE802． 15． 4 ；保障时隙；网络微积分中图分类号： TP393． 01 文献标志码：A
Abstract: Every Guaranteed Time Slot ( GTS) mechanism in IEEE 802． 15． 4 standard can be allocated multiple slots to guarantee the realtime data transmission． For the lack of analyzing multislot GTS performances under contention free period， the network calculus， was used to analyze the service curves of delay bound and throughput， and the connection with energy consumption． The IEEE802． 15． 4 sensor node model which has proposed by Jurcik and Koubaa has been improved， and modeling and simulation were done to study how GTS parameters influenced the network performances ( delay， throughput and energy consumption) ． The simulation results indicate that according to high or low burst data rate， there is an optimized allocation of GTS parameters to meet the realtime data transmission． Key words: Wireless Sensor Network ( WSN) ; IEEE802． 15． 4; Guaranteed Time Slot ( GTS) ; network calculus

IEEE Std 802.15.4

The technology will be available on Q4 200x
Antenna
• The higher the frequency the smaller the antenna … … and the propagation range is worst! • Antenna connectors are expensive • Antenna design is considered “black magic” • Antennas needs to be designed with the entire sensor package in mind Is the antenna integrated to the sensor? PCB antennas acts as attenuators • Metal, metal, metal….
W-WAN $$$$ Satellite UWB Power Consumption 3G Cost/Complexity 2.5G 2G 1G WMAN WIFI 802.11a HiperLAN 802.11g 802.11b WLAN Bluetooth 802.15.3 $
802.15.4
802.16 WIMax
Which Technology is Good for our Needs?
Leading Wireless Technologies Comparison
© 2005 Eaton Corporation. All rights reserved.
Standards Technology Map 2005
Vision
• Add value to current and future product offerings using wireless technologies to enable:

IEEE802.11a WLAN干扰环境下的UWB WBAN系统可靠性研究

IEEE802.11a WLAN干扰环境下的UWB WBAN系统可靠性研究王瑞;贺鹏飞;冯现豪【摘要】WBAN (Wireless body area network) has great potential application value in the field of health care. However, the ultra-wideband radio frequency assigned to biological care overlaps with the IEEE802.11a WLAN frequency band. For this reason, the UWB WBAN equipment would be interfered by the IEEE802.11a WLAN signal. Based on existing time hopping pulse position modulation (TH-PPM) and direct sequence pulse amplitude modulation (DS-PAM) UWB system model, the UWB WBAN physical layer interference model is constructed. Via the system reliability analysis and simulation, the bit error rate of DS-PAM UWB WBAN system and the TH-PPM UWB WBAN system are compared under the IEEE802.11a WLAN signal interference environment. The experiment results indicate that the DS-PAM UWB WBAN system has better anti-interference performance than the TH-PPM UWB WBAN system.%无线体域网(WBAN)在医疗保健方面有着巨大的潜在应用价值,但分配给生物医疗的超宽带(UWB)无线频段和IEEE802.11a WLAN的频段部分相重叠,因此UWB WBAN设备将会受到IEEE802.11a WLAN信号的干扰.基于已有的跳时扩频脉冲位置调制(TH-PPM)和直接序列扩频脉冲幅度调制(DS-PAM)超宽带系统模型,构建UWB WBAN物理层干扰模型.通过误比特率仿真,对比分析了DS-PAM UWB WBAN系统与TH-PPM UWB WBAN系统在IEEE802.11a WLAN信号干扰环境下的可靠性.结果表明,DS-PAM UWB WBAN系统较TH-PPM UWB WBAN系统具有更好的抗干扰性能.【期刊名称】《通信技术》【年(卷),期】2017(050)006【总页数】5页(P1193-1197)【关键词】无线体域网;超宽带;无线局域网;干扰;误比特率【作者】王瑞;贺鹏飞;冯现豪【作者单位】烟台大学光电信息科学技术学院,山东烟台 264025;烟台大学光电信息科学技术学院,山东烟台 264025;烟台大学光电信息科学技术学院,山东烟台264025【正文语种】中文【中图分类】TP393随着社会的日益发展和人们生活水平的提高，工作压力不断加大，健康问题受到人们越来越多地关注。

跳时超宽带(TH-UWB)多址系统性能的研究

关键词：时超宽带（跳ＴＨ— ＵＷＢ；）多址干扰；噪比；据速率信数
中图分类号：Ｎ９９５３Ｔ２．３
文献标识码：Ａ
文章编号：６３８５２０）４０８ —４１７２Ｘ（０７０ —４１０
ＳｕｙｏｒｏｍａｃｆＴＨ－ｔｄｎｐｅｆｒｎｅｏ・ＵＷＢｕｔ－ｃｅｓｓｓｅｍｌｉａｃｓｙｔｍ ‘
ｔｈｏｒｈＡＩｉｈｅｔｅｙｔａｔＭｓＧａｕｓａｉｈａｇｅｎｕｂｒｏｆｕｓｒ．Ｂｅｉｓ，ｔｅｕｓｉｎｗｔａｌｒｍｅｅｓｓｄｅｈｐｐｅｏｕｓｇｖｅｉｇｍａｈｍａｉａｒｂｎｄｉｉｎｕｓｎｔｅｔｃｌｅｘｐｒｓｉｎ．ＳｉｕｌｔｏｎｒｓｔｈｏｔｔｔｈｅｒｔｃｌＢＥＲｏｍｕｌｏｒｓｏｎｄｌｗｉｈｔｘｐｅｉｅａｅ．ｅｓｏｍａｉｅｕｌｓｓｗｈａｈｅｔｏｅｉａｆｒａｃｒｅｐｓｗｅｌｔｈｅｅｒｍｎｔｌｏｎｓ
ｓｍｕｌｔｏｎ，ｓｏｗｉｇｔｔｉｐｅｆｃｏｗｅｏｎｒｌｗｉｌｌａｏｔｃｅｓｎｓｓｅｔａｅ，ａｈｒｏｒａｅｉａｉｈｎｈａｍｒｅｔｐｒｃｔｏｌｅｄｔｈｅｄｅｒａｅｉｙｔｍｄａａｒｔｎｄｔａｔｐｅｆｍｎｃｉｉｆｓｇｈｔ（ｎ１ｎｅｏｉＬＯＳ）ｃｎｎｅｆｅｕｔｏｅｈｎｔＬＯＳｈａｅｓｈａ１ｏｔｎｏｄｓｔａｔｉｈｅＮｃｎｎｌ．

一种利用线性调频信号的新型扩频调制技术

一种利用线性调频信号的新型扩频调制技术吴进;孔辉【摘要】根据上扫频和下扫频线性调频(LFM)信号的特性,针对传统的超宽带无线通信系统中线性调频扩频技术存在的调制效率低、误码率性能低、实现复杂高等问题,结合线性调频(Chirp)扩频以及循环移位编码(CCSK)扩频,提出了一种基于线性调频信号的循环移位线性调频扩频技术(CS-CSS).首先,将输入数据映射在循环移位因子(CSF)上;然后,根据CSF数值对基带所产生的Chirp信号进行循环移位达到调制的目的;最后,在解调端经过加窗处理、快速傅里叶变换(FFT)得到与发射端对应的CSF,从而得到发送的数据.误符号率的仿真结果与理论推导公式相吻合,从调制效率和误码率性能上讲,该方案相比线性调频二进制正交键控(Chirp BOK)系统具有超过10 dB的误码率性能.因此,该方案具有更好的误码率性能、更高的调制效率及实现更低的复杂度.%According to the characteristics of the up-chirp and down-chirp linear frequency modulation(LFM) signal,a new spread spectrum technology called Cyclic-Shift Chirp Spread Spectrum(CS-CSS) combing with the Chirp spread spectrum(CSS) and the Cyclic Code-ShiftKeying(CCSK) is proposed to solve the problem of low modulation efficiency,low bit error rate(BER) performance and complex implementation in traditional ultra-wide band(UWB) wireless communication systems.Firstly,the input data is mapped on the Cyclic-Shift Factor(CSF).Then,cyclic shift is performed for the Chirp signal collected from baseband and produced by CSF value to realize modulation.Finally,by adding window function processing and fast Fourier transform(FFT) the CSF matching with the transmitter is obtained and the original data isproduced.Because the BER-SNR performance between theoretical analysis and simulation is matched,in the perspective of modulation efficiency and BER performance,the proposed scheme has a BER performance over 10 dB compared with Chirp Binary Orthogonal Keying(Chirp BOK) system.In conclusion,it has better BER performance,higher modulation efficiency and easy implementation.【期刊名称】《电讯技术》【年(卷),期】2017(057)004【总页数】5页(P397-401)【关键词】超宽带通信;线性调频信号;Chirp扩频调制效率;循环移位编码【作者】吴进;孔辉【作者单位】西安邮电大学电子工程学院,西安 710121;西安邮电大学电子工程学院,西安 710121【正文语种】中文【中图分类】TN914.42线性调频(Linear Frequency Modulation,LFM)信号(也称Chirp信号)是一种瞬时频率与时间成正比的正弦波信号，具有很好的自相关性以及极低的互相关性等时域特性，多用于雷达系统、军事通信中。

一种应用于超宽带系统的宽带LNA的设计

收稿日期:2005206206;　定稿日期:2005208219基金项目:国家重点基础研究发展(973)计划资助项目(G2000036508);国家自然科学基金资助项目(60236020);国家高技术研究发展(863)计划资助项目一种应用于超宽带系统的宽带L NA 的设计桑泽华,李永明(清华大学微电子学研究所,北京　100084)摘　要:　结合切比雪夫滤波器,可以实现宽带输入匹配的特性和片上集成窄带低噪声放大器(L NA )的噪声优化方法。

提出一套完整的基于CMOS 工艺的宽带L NA 的设计流程,并设计了一个应用于超宽带(U WB )系统的3～5GHz 宽带LNA 电路。

模拟结果验证了设计流程的正确性。

该电路采用SM IC 0.18μm CMOS 工艺进行模拟仿真。

结果表明,该L NA 带宽为3～5GHz ,功率增益为5.6dB ,带内增益波动1.2dB ,带内噪声系数为3.3～4.3dB ,IIP3为-0.5dBm ;在1.8V 电源电压下,主体电路电流消耗只有9mA ,跟随器电流消耗2mA ,可以驱动1.2p F 容性负载。

关键词:　低噪声放大器;切比雪夫滤波器;超宽带;无线局域网中图分类号:　TN722.3 文献标识码:　A 文章编号:100423365(2006)0120114204A Wideband Low Noise Amplif ier for U ltra WideB and SystemSAN G Ze 2hua ,L I Y ong 2ming(I nstit ute of Microelect ronics ,Tsinghua Uni versit y ,B ei j ing 100084,P.R.China )Abstract :　A new design flow is presented by combining the wideband match network theory with the low noise design technique for integrated narrowband low noise amplifier (L NA ).As a demonstration ,a wideband L NA is de 2signed based on this design flow ,which is validated by simulation using SMIC ’s 0.18μm technology.Results from the simulation show that the L NA circuit has achieved an operating f requency ranging f rom 3GHz to 5GHz ,a pow 2er gain between 4.4dB and 5.6dB ,a noise figure f rom 3.3dB to 4.3dB and an IIP3of -0.5dBm.The circuit dis 2sipates 11mA current f rom a single 1.8V power supply ,and it is capable of driving 1.2p F capacitive load.K ey w ords :　Low noise amplifier ;Chebyshev filter ;Ultra wide band ;WL AN EEACC :　1220　1　引　言IEEE 802.15.3是一种无线个人域网(WPAN ,Wireless Personal Area Network )标准,包含MAC和P H Y 两部分。

太赫兹(THz)物理、器件及其应用

MC solution of Boltzmann equation
The semi-classical BE for transport of Bloch electrons: f (r , k , t ) 1 F f |coll , k E (k ) r f k f t t
• Used to solve mathematical problems by random-number technology • Using random numbers in an essential way to simulate scattering processes • The differential-integral equations usually include high-order numerical integrations
发展了THzQCL MC模拟程序，设计了基于共振声子散射的THzQCL。研究了子带激光器动力学
Phys. Rev. Lett. 90, 077402 (2003) Appl. Phys. Lett. 88, 061119 (2006) J. Appl. Phys. 104, 043101 (2008)

完成了THzQCL材料生长、器件制作
-

优化了THzQCL器件设计
-
Roadmap of THzQCL
The first THzQCL - Kö hler et.al, Nature 2002 (Pisa, Italy)
•
• • •
Chirped-superlattice
Semi-insulating surface plasmon waveguide Lasing at 4.4 THz Maximum operating temperature of 50 K