基于UWB的隐藏活动目标穿墙雷达接收机前端研究

介绍一种超宽带穿墙雷达接收机前端的实现方案，并对其中的波门控制电路、相关检测电路的实现作了详细的描述。最后通过实验，验证了此设计方案能够满足测距精度为37．5mm，总作用距离为9．5625m的穿墙雷达前端接受机的要求，达到了预期效果。     

宽带Chirp信号对阵列天线的波瓣影响

为了解决超宽带信号源的无源定位问题,运用能量相关方法计算天线波瓣,对宽带Ch irp信号作用于阵列天线的波瓣图进行了计算与分析,提出了分类相位控制形成宽带接收波束的一般结构和实现途径。讨论了通过信号带宽提高角度脉压分辨率的一般经验准则。     

一种采用多天线的OFDM超宽带通信系统的性能分析

本文首先研究了在典型室内信道下基于OFDM技术的超宽带（UWB）通信系统的性能，并提出了一种接收能量模型。在此基础上，推广到多天线的情况，得到了基于该系统的误码率表达式。最后，通过仿真验证了分析结果。结果表明本文的分析方法是准确合理的，天线的数目对系统性能有较大的影响     

IEEE802系列宽带无线接入标准简介

随着Internet和数据通信产业的迅速发展,宽带无线接入成为当前通信业界的讨论热点。结合最新的宽带无线接入技术,重点介绍了IEEE802系列宽带无线接入标准,并从覆盖范围、工作频率、移动性等6个方面对它们进行了比较。     

基于UWB技术的Ad Hoc移动网络

随着Ad Hoc移动网络的发展和UWB技术的逐步成熟，研究采用UWB技术对Ad Hoc移动网络协议带来的影响，就变得非常迫切而且很有意义：本文简单介绍了UWB技术，探讨了采用UWB技术的Ad Hoc移动网络在网络协议方面需要做的改动和目前的研究成果，并描述了其应用前景。     

Triple band notched mushroom and uniplanar EBG structures based UWB MIMO/Diversity antenna with enhanced wide band isolation

Triple band-rejection MIMO/Diversity UWB antenna characteristics are described in this paper. Proposed antenna discards worldwide interoperability for microwave access WiMAX band from 3.3 to 3.6 GHz, wireless local area network WLAN band from 5 to 6 GHz and X-Band satellite downlink communication band from 7.1 to 7.9 GHz. Mushroom Electromagnetic Band Gap (EBG) structures helps to attain band notches in WiMAX and WLAN bands. Uniplanar plus shaped EBG structure is used for notch in X-band downlink satellite communication band. Decoupling strips and slotted ground plane are employed to develop the isolation among two closely spaced UWB monopoles. The individual monopoles are 90° angularly separated with stepped structure which helps to reduce mutual coupling and also contributes towards impedance matching by increasing current path length. Mutual coupling magnitude of more than 15 dB is found over whole UWB frequency range. The Envelope Correlation Coefficient is less than 0.02 over whole UWB frequency range.The variations in the notched frequency with the variations in mushroom EBG structure parameters are investigated.The antenna has been designed using FR-4 substrate and overall dimensions is (64 × 45 × 1.6) mm³.     

宽带系统中载波频偏与采样频偏的联合估计

提出一种针对多波带正交频分复用系统中载波频偏与采样频偏的联合估计算法。为了在频偏较小时获得对噪声干扰足够的鲁棒性,用预偏转技术把频偏预旋转到一个较大的值作估计。该算法在频域处理3个连续相同的前导符,它对频率相关性I/Q失配和频率无关性I/Q失配都具有很好的鲁棒性。基于多波带正交频分复用超宽带无线传输系统的仿真结果,验证了提出的载波频偏和采样频偏联合估计算法的有效性。     

基于UWB的工业控制网络体系结构研究

鉴于现阶段无线技术在工业控制系统应用中存在的问题,将UWB(Ultra Wideband)技术引入到工业控制网络中.提出了基于UWB的双频二级工业控制网络体系结构.同时,在此体系结构基础上设计了相应的通信模型和设备模型,并对此方案进行了分析和评价.该方案在系统级上部分缓解了无线技术在工业环境中实时性和可靠性先天不足的问题.     

一种基于UWB穿戴式网络的调度算法

可穿戴式计算机是近几年的一个研究热点,穿戴式网络多个节点之间的协调通信一直是影响穿戴式计算机发展的一个重要原因,因此有必要对穿戴式网络通信进行优化。文中介绍了可穿戴式计算机以及穿戴式网络。论述了穿戴式网络中常用的几种网络技术的优缺点。然后重点解析了UWB（Ultra—WideBand）的结构模型,以及UWB通信机制,在UWB通信机制的基础上引入了动态调度的思想,由此引出具有优先级的动态UWB网络调度算法。此调度算法能够很好地协调穿戴式网络节点之前的通信,有利于推进可穿戴式计算机的发展。     

Higher order statistics applied to IR‐UWB system based on M‐OAM

In this paper, an original communication system based on the ultra‐wideband technology and dedicated to intelligent transport systems is proposed. The ultra‐wideband presents a promising option for short‐range wireless communication system due to the transmission of very short pulses with low energy. To ensure reliability, safety, and security in the road, the proposed system must provide high data rate and good quality of service. The high data rate is ensured by the use of new modulation Orthogonal Amplitude Modulations. The quality of transmission is improved by the implementation of higher order statistic method at the receiver to eliminate the Gaussian noise and perform more precise decoding. Therefore, good performances in terms of bit error rate are guaranteed.