元器件快讯

用于嵌入式红外线通信的IrDA软件解决方案安捷伦科技公司 (AgilentTechnologies)宣布推出一种快速、经济的IrDA协议堆栈软件解决方案。该软件在新型移动电话、PDA、办公设备、数码相机以及医疗设备和工业自动化设备等产品中嵌入兼容IrDA(红外线数据协会)的无线通信功能提供了便利。安捷伦的HSDL -S100IrDA协议堆栈提供了管理数据传送所需的所有功能。它采用IrDA标准、速率高达4Mb/s ,可在任何支持ANSIC编程语言的平台上运行。安捷伦的IrDA协议堆栈包括对象交换(OBEX)和移动通信红外线(IrMC)模块 ,可促进无线文件的交换及数…     

基于IrDA标准的红外无线数字通信及应用

概述了红外无线通信的概念，介绍了IrDA通信协议，在此基础上设计了一种基于单片机的通用红外通信接口模块，它支持IrDA协议，采用串行输入输出，可以做为附加通信模块方便地集成到各种设备和仪器仪表中。     

便携式红外收发器的设计与实现

介绍了一种以C8051F310单片机为控制核心，可实现红外数据通信的便携式收发器。对其基本原理和标准规范进行了说明，给出了设计思路和硬件电路。阐述了电源处理各模块的特性和实现过程。同时给出了符合IrDA标准通讯协议的设计方法。     

IrDA红外通信器件在空调器检测线上的应用

实现无线数据通讯有多种方式，当前流行的主要是蓝芽技术和红外通信技术。IrDA红外通信是一种低价的、适应性广的短距离无线通讯技术。文章介绍了IrDA的有关协议、实现方法以及在连续检测数据采集系统中的应用。     

基于IrDA协议的红外无线通信机制研究

红外光无线通信是一种低成本,高速率,短距离的无线通信方式,随着现代科技和光无线通信领域的发展,红外无线通信IrDA协议逐渐被通信、IT领域所接受,并成为支持近距离无线数据传输的主要规范。文章主要介绍了IrDA协议的内容,以及IrDA协议栈的基本结构,重点研究了链路建立层协议IrLAP规范和通信机制,为进一步优化链路,提高通信利用率打下基础。     

一种新的红外焦平面图像信号无线光输出协议

文中提出了一种针对红外焦平面图像信号无线光输出的高速数据链路层协议。该协议以IrDA标准的红外数据链路协议（IrLAP）作为参考，通过红外无线信道来实现点对点、高速、稳定的图像信号输出。协议的设计充分考虑了对多种红外传输速率的支持，以及位错误率（BER）、红外帧长度、应答分组大小等因素对系统传输吞吐量的影响，提出了寻找合适参数有效的计算方法，以及基于FPGA的红外无线视频传输平台的设计方法。实验结果显示，传输平台可以在16Mb／s的红外传输速率下长期稳定工作。这表明本协议适用于VFIR及更高速率的图像无线传输，经过不断地测试与完善，可为制订今后焦平面图像信号光输出规范提供参考。     

一种新的红外焦平面图像信号无线光输出协议

文中提出了一种针对红外焦平面图像信号无线光输出的高速数据链路层协议。该协议以IrDA标准的红外数据链路协议(IrLAP)作为参考，通过红外无线信道来实现点对点、高速、稳定的图像信号输出。协议的设计充分考虑了对多种红外传输速率的支持，以及位错误率(BER)、红外帧长度、应答分组大小等因素对系统传输吞吐量的影响，提出了寻找合适参数有效的计算方法，以及基于FPGA的红外无线视频传输平台的设计方法。实验结果显示，传输平台可以在16Mb／s的红外传输速率下长期稳定工作。这表明本协议适用于VFIR及更高速率的图像无线传输，经过不断地测试与完善，可为制订今后焦平面图像信号光输出规范提供参考。     

OBEX研究及.net Compact框架实现红外通信的应用

IrDA是一种利用红外线进行通信的点对点通信的技术.设备间的红外线通信具有方便快捷、无需额外硬件支持等特点.基于对OBEX协议的研究,本文在Visual Studio.net Compact框架下,设计并实现了两个独立设备利用红外接口进行信息传输的功能.     

PDA遥控红外家电设备初探

探讨了个人数字助理和通用遥控器的融合与集成技术，并在Windows CE上实现了用红外端口遥控Sony电视机的应用程序，初步实现了对二者进行融合的设计思想；并针对红外通讯的基本原理、Sony电视机的红外线遥控协议、IrDA串口编程技术等作了必要的介绍。     

红外通信IrDA标准与应用

红外光是有许多优势的通信媒介，红外通信IrDA标准是目前IT和通讯业普遍支持的近距离无线数据传输规范。本文介绍了红外通信IrDA标准的内容以及它的物理层协议，脉冲调制的必要性，不同传输速率下不同的脉冲调制方式，连接建立协议层的帧结构。给出了符合IrDA标准的芯片TOIM32325和TFDS4500在高电压环境下调试实验设备的应用。     

手持终端设备中基于对象交换协议的红外传输功能的设计与实现

通过红外进行文件传输,在手持终端设备中具有较高的实用意义.在可选的红外协议中,红外对象交换协议(OBEX)具有简单、实用、可移植性强等优点而被广泛应用.本文详细分析了利用对象交换协议进行文件传输的步骤,并给出了基于嵌入式linux系统的具体实现方案,最后介绍了在便携式多媒体中心的应用平台上红外传输功能的实现情况.     

OBEX Over IrDA: Performance Analysis and Optimization by Considering Multiple Applications

OBEX (Object Exchange Protocol) is a session protocol designed to exchange all kind of objects between portable devices using different ad hoc wireless links including IrDA and Bluetooth. This paper develops a mathematical model for OBEX over the IrDA protocol stack by considering multiple applications and presence of bit errors. The model is also verified by simulation results. We derive throughput equations and carry out an optimization study focusing on four major parameters: OBEX packet size, TinyTP (IrDA transport layer) buffer size, IrLAP (IrDA link layer) frame and window size. Equations are derived for the optimum IrLAP window and frame sizes. Numerical results show significant improvement on OBEX performance using the optimized parameters. The major contribution of this work is the modelling of OBEX including the low layer protocols and optimization of the overall throughput by appropriate parameter selection     

Wireless infrared communication system based on edge position modulation

Driven by the Infrared Data Association (IrDA) wireless infrared communication has become a very popular and widely used method for short range data transmission between mobile devices like laptops, PDAs and mobile phones. Quality and speed of infrared communications are mainly limited by the bandwidth of the infrared transceivers. Therefore it is important to use a modulation technique with a high bandwidth efficiency, while simultaneously maintaining a low bit error rate and high power efficiency. Consequently, IrDA has continuously improved the modulation techniques of its standards (IrDA, 2001) by introducing Return to Zero inverted (RZI), 4 Pulse Position Modulation (4-PPM) and HHH(1, 13), whereby the latest is basically a 2/3-rate Run-Length-Limited (RLL) code (Hirt, Hassner, Heise, 2001). Recently the authors have published a novel modulation scheme called Edge Position Modulation (EPM) with Run-Length-Limited (RLL) coding (Lüftner et al., 2003). This article will continue this work by presenting a completely new RLL(5, 12) code that is optimized for EPM.     

Optimization of IrDA IrLAP link access protocol

The widespread installation of millions of Infrared Data Association (IrDA) infrared (IR) ports in mobile devices for wireless communication applications necessitates for throughput performance optimization of the IR links at the IrDA link access protocol (IrLAP) link layer. For IrDA connectivity, link-layer throughput optimization is important for any line bit-error rate (BER). The paper provides a mathematical model with which we derive a simple equation linking IrLAP throughput with physical and link-layer parameters. Simple equations for optimum values of window size and frame length for maximum link-layer throughput as a function of BER are derived. A study of the importance of parameters such as link minimum turnaround time and F-timer time out period is presented. Finally, a protocol improvement that utilizes special supervisory frames (S frames) to pass transmission control is proposed to deal with delays introduced by F-timer expiration. Results indicate that employing the special S frame highly improves throughput performance when optimum window and frame-size values are implemented.     

IrBurst Modelling and Performance Analysis in the Presence of Transmission Errors

IrBurst is a session/presentation layer protocol dedicated for high speed large volume information transfer over IrDA links. The protocol is developed by IrDA in order to complement the existing protocol OBEX which is best suited for small files. This paper presents a mathematical model for IrBurst over the IrDA protocol stacks taking into account the presence of bit errors and multiple simultaneously applications. The performance of IrBurst is examined considering TinyTP buffer sizes and the number of IrBurst application connections as parameters. The contribution of this work is to develop a mathematical model for IrBurst, investigate the compatibility of IrBurst to low layer protocols, as well as providing suitable design guidelines for IrDA devices for high performance of IrBurst. Pi Huang received the B.Sc. degree in Electrical and Electronic Engineering from University of Central Lancashire, U.K., in 2001, the M.Sc. degree in Telecommunications from University College London, U.K., in 2002 and the Ph.D degree in the Personal Wireless Networks and Outdoor Optical Links from Bournemouth University, U.K., in 2006. He is currently working in wireless solution division of British Telecom. His research focuses on performance modelling and analysis as well as discrete-event simulation of wireless communication protocols and wireless communication networks. He has published over 20 papers in the areas of wireless communications. Anthony C. Boucouvalas has worked at GEC Hirst Research Centre, and became Group Leader and Divisional Chief Scientist until 1987, when he joined Hewlett Packard (HP) Laboratories as Project Manager. He joined Bournemouth University in 1994 and became a Professor in Multimedia Communications in 1996, and in 1999 became Director of the Microelectronics and Multimedia Research Centre. His current research interests span the fields of wireless communications, optical fibre communications and components, multimedia communications, and human-computer interfaces, where he has published over 200 papers. He has contributed to the formation of IrDA as an industry standard and he is now a Member of the IrDA Architectures Council. He is a Fellow of Fellow of the Royal Society for the encouragement of Arts, Manufacturers and Commerce, (FRSA) and a Fellow of IEE, (FIEE). In 2002 he became a Fellow of the Institute of Electrical and Electronic Engineers (FIEEE), for contributions to optical fibre components and optical wireless communications. He is an Editor of numerous Journals and in the Organising committee of many conferences.