无线局域网与无线个域网标准的演进

文章介绍了无线局域网和无线个域网所涉及的主要标准的应用场合、技术特点及协议构成，比较了它们存在的差异及各自的特点，并根据市场发展给出了它们可能的发展趋势。     

积极发展我国数字集群移动通信的频谱管理与产业发展对策

在介绍数字集群无线电的基本特生和其发展背景的基础上，主要阐述了积极发展我国数字集群移动通信的频谱管理和产业发展的对策。     

一种基于IEEE802.15.3 MAC协议的动态资源分配算法

介绍了IEEE802.15.3 MAC协议及其QoS机制,分析了超帧中的CAP,针对实时VBR业务流,提出了一种动态资源分配算法,在性能上与平均资源分配算法进行了比较和分析,通过仿真验证了此动态资源分配算法能有效降低实时VBR码流的丢帧率,提高系统传输的QoS.     

Overhead and Segmentation Mismatch Effect on Bluetooth WPAN Performance

Currently, Bluetooth is the most widely used technology for Wireless Personal Area Networks (WPAN). Quality-of-Service (QoS) support is critical to ensure bandwidth maximization for mobile applications based on this WPAN technology. The overhead introduced by the different layers of Bluetooth protocol may have a serious impact on WPAN performance. However, most studies of Bluetooth performance neglect this overhead and assume that data are directly transmitted over L2CAP (Logical Link Control and Adaptation Protocol) or even HCI (Host Controller Interface) layers. In fact, this option is not feasible in most Bluetooth applications, as they integrate actual devices that implement a particular Bluetooth profile, usually SPP (Serial Port Profile). The use of profiles cannot be disregarded as they guarantee the interoperability between devices from different vendors. The aim of this paper is to characterise the performance of a Bluetooth WPAN (specifically the end-to-end delay and the throughput) when profiles are utilised. This study takes into account the overhead added by the protocols taking part in the transmission of user data. This paper also explores the effect of segmentation mismatch that may appear when the maximum size for data in each layer of the architecture is different. The analysis has been focused on SPP and PAN (Personal Area Networks) profiles. In the case of the PAN profile, the study concludes that the network performance decreases for user data sizes greater than 1,472 bytes, since the excessive overhead added by the network layer is increased by the IP (Internet Protocol) fragmentation. In the case of SPP, an inappropriate choice of the maximum data unit at RFCOMM (Radio Frequency Communication for Serial Cable Emulation Protocol based on ETSI TS 07.10) and L2CAP layers can also heavily affect the transmission delay.

A Blind Adaptive Technique for Cancelling ICI in OFDM-WPAN Systems

This paper proposes a hybrid OFDM/TDMA (Orthogonal Frequency Division Multiplexing/Time Division Multiple Access) scheduling method to obtain fine bit-rate granularity in wireless personal area networks (WPANs). A new blind adaptive receiver structure that combats the effects of inter-carrier interference (ICI) caused by users’ frequency offsets is also proposed to improve the system throughput. The proposed blind adaptive receiver is based on constant modulus (CM) criterion and requires no more knowledge of the frequency offsets of interferers’ signals than the conventional receiver. The advantage of our countermeasure is that frequency-guard or redundant data is not needed, thus the throughput performance will not degrade, and estimation of the frequency offset is also no longer necessary. In order to make the adaptive receiver realizable, we develop a soft-constraint-satisfaction (SCS) based algorithm to achieve faster convergence. Simulation results show that our proposal is capable of significantly reducing the influence of ICI.     

基于AT86RF230 ZigBee的WPAN网络设备设计

介绍ZigBee技术近几年来发展的基本状况及IEEE 802.15.4协议的基本构架;详细论述基于Atmel公司AT86RF230射频收发芯片的WPAN网络设备的设计,并且给出了相关系统的硬件组成和软件流程;最后通过试验证明此系统具有较低的功耗和较高的性价比.     

Zig Bee路由技术研究

Z ig Bee是一种新兴的专为低速率无线个域网(WPAN)而设计的低成本、低功耗的短距离无线通信技术,能够广泛应用于低速率传感器网络。Z ig Bee路由协议是Z ig Bee网络层的核心,在介绍Z ig Bee网络配置和网络拓扑结构的基础之上,深入分析了Z ig Bee网络中的路由协议,并对其中的关键技术问题进行了研究和总结。     

Zigbee无线传感器网络的研究与实验

Zigbee低功耗无线网络,作为现存的最适合于搭建无线传感器网络的新兴技术,目前已经越来越多地受到人们的关注.文章详细介绍了Zigbee无线协议的框架结构,消息传输及寻址方式,并给出了基于Zigbee无线传感器网络的组网及路由过程.最后通过使用Michrochip公司提供的TSZ-008 Zigbee开发套件,进行了基于Zigbee协议的消息发送、接收及RFD设备功能实验.     

基于ZigBee的穿戴式多生理参数WPAN

本文提出了基于ZigBee的多生理参数WPAN监护网络的设计方案.该方案以CC2430为核心器件,进行嵌入式ZigBee通信模块设计,包括集成各生理参数传感器的微型化RFD模块、带转发功能的Router模块、以及WPAN中心节点Coord模块.实验证明,该WPAN监护网络能实现生理信号的精确采集和无线传输,并可在星型和树型网络间自由切换.系统具有低功耗、微型化、无线化、高精度、抗干扰能力强等优点.     

IEEE 802.15.4关键技术及标准进展

无线个人区域网络（WPAN）把几米范围内的多个设备通过无线的方式连接在一起,使它们可以相互通信。IEEE 802.15工作组致力于WPAN的网络的物理层和媒体访问层的标准化工作。而802.15.4主要对低速WPAN相关技术进行研究和标准化工作。本文在对802.15工作组介绍的基础上,重点介绍802.15.4工作组研究的相关技术和及其标准化情况。