Broadband Indoor Wireless Access Using Infrared

对高速便携式多媒体工作站的需求预计将加速宽带无线本地接入的使用。便携式无线电头设备要求低功耗、小尺寸和重量。对满足这些要求的廉价、高速传输链路的需求激发了对室内无线接入的研究。未来的便携式多媒体工作站需要宽带连接到电缆主干局域网，以便在多媒体通信中传输150 Mb/s或更高数量级的高数据速率。宽带无线本地接入面临着重大的技术挑战，这是一个重要的研究领域。红外和射频（RF）技术都正在研究这一应用。然而，室内无线IR提供了大量的室内RF的优点，将在下一节中解释，拟议的研究是集中在一个新的设计的联合优化收发器的光天线分集系统的宽带无线ATM室内IR本地接入。为了实现这一目标，我们计划通过以下方式研究一种点扩散多视线方法：1。设计并制作了一个计算机生成的全息分束器，用于在发射机上产生多个漫射光斑;2。设计并制作了一种用于复合角度分集接收机窄视场分支的集聚光、滤波功能于一体的全息反射镜;发射机和接收机参数联合优化;4.原型模型将用作宽带无线接入手段，与ATM局域网接口 高速多媒体工作站。我们也将调查是否服务质量（QoS）的端到端的ATM虚拟连接可以通过这样的无线物理介质得到保证。与任何当前可用的无线IR光学传输系统相比，该努力应导致约OC-12的更高传输速率和约100米直径的更大覆盖范围。无线配置将能够处理多对一和一对多的通信，而无需直接的视线要求，并将容忍阴影和阻塞。

9820604KavehradThe need for high-speed portable multimedia workstations is expected to accelerate the use of broadband wireless local access. Portable radio head devices require low power consumption, small size and weight. The demand for inexpensive, high-speed transmission links satisfying these requirements has motivated the research on indoor wireless access. Future portable multimedia workstations need wide bandwidth connections to cabled backbone LANs in order to transfer high data rates in the order of 150 Mb/s or more in multimedia communications. There are major technological challenges for broadband wireless local access and this is an important research area. Both IR and Radio Frequency (RF) technologies are being examined for this application. However, indoor wireless IR offers a great number of advantages over indoor RF as will be explained in the next section.The proposed research is focused on a novel design of a jointly optimized transceiver optical antenna diversity system for broadband wireless ATM indoor IR local access. To achieve this, we plan to work on a spot-diffusing multiple lines-of-sight approach through:1. Design and fabrication of a computer generated holographic beam-splitter, to be used at the transmitter for producing multiple diffusing spots;2. Design and fabrication of a holographic mirror combining, concentrating and filtering functions, to be used at the narrow field-of-view branches of a composite angle diversity receiver;3. Joint optimization of transmitter and receiver parameters;4. Prototyped models will serve as broadband wireless access means, interfacing an ATM local area network of high-speed multimedia work stations. We will also investigate whether Quality-of-Service (QoS) of an end-to-end ATM virtual connection can be guaranteed through such a wireless physical medium. In comparison with any currently available wireless IR optical transmission system, the effort should result in a higher transmission rate of about OC-12 and a larger range of coverage of about 100 meters diameter. The wireless configuration will be capable of handling many-to-one and one-to-many communications without direct line-of-sight requirements and will be tolerant to shadowing and blockage.