Broadband Wireless ATM Local Loop Using Millimeter Wave-Band

本研究旨在将宽带通信与无线接入相结合，从而使人们能够不受限制地接入广泛的宽带通信服务，如交互式多媒体通信、高分辨率图像或大文件传输以及高分辨率视频会议。这是通过毫米波无线电技术和小型高增益天线实现的。这种技术被称为下一代本地多点分配系统（NG-LMDS）。这是一个具有成本效益的竞争对手，所有有线提出的替代方法的宽带分布。宽带无线接入将为人们提供潜在的巨大带宽需求。它有潜力简化用户在固定地点使用交互式商业、信息和娱乐服务的过程。建立一个本地无线接入网络，结合最先进的毫米波无线电技术，加上异步传输模式的无线接入点，将为家庭、学校和企业的好处，选择有关的广播和双向多媒体通信服务的不断扩大的名单。研究结构包括：ATM-LMDS蜂窝结构中干扰的统计分析;固定蜂窝ATM-LMDS结构的设计;通过利用高增益天线、频率分段和极化交织来实现最小干扰。频率复用ATM-LMDS蜂窝结构的频谱效率分析。在ATM-LMDS蜂窝体系结构中，将自适应编码技术与自适应调制技术相结合，扩展了自适应编码的动态范围，研究了反馈信道损伤和传输时延对自适应速率系统在ATM-LMDS无线环路中保持端到端服务质量（Quality-of-Service，QoS）性能的影响，分析了自适应速率编码技术在ATM-LMDS衰落信道中的时延和吞吐量。评估自适应传输速率对ATM-LMDS蜂窝结构干扰水平的影响。

This research aims to unite broadband communications with wireless access thus making possible un-tethered access to a wide range of broadband communications services, such as interactive multimedia communications, high resolution image or large file transfer, and high resolution video teleconferencing. This is done through millimeter wave radio technology and small high-gain antennas. This technology is termed next-generation local multi-point distribution system (NG-LMDS). This is intended to be a cost-effective competitor to all wire-line proposed alternative methods of broadband distribution. Broadband wireless access will afford potentially enormous bandwidth on demand to people. It has the potential to simplify access to interactive business, information and entertainment services by subscribers in fixed locations.Establishment of a local wireless access network which integrates the most advanced millimeter-wave radio technology, coupled with asynchronous transfer mode Wireless Access Point (WAP) will provide homes, schools and businesses with the benefits of choice as regards the expanding list of broadcast and bi-directional multimedia communications services. The research structure involves:Statistical analysis of interference in an ATM-LMDS cellular configuration.Design of fixed-cellular ATM-LMDS architectures; with minimum interference by taking advantage of high-gain antennas, frequency-segmentation and polarization interleaving. Analysis of spectral-efficiency in frequency reuse ATM-LMDS cellular architectures. Extending the dynamic range of adaptive-coding by combining it with adaptive modulation in ATM-LMDS cellular architecture.Investigating the influence of feedback channel impairments and transmission delay on the performance of adaptive rate systems in preserving an end-to-end Quality-of-Service in ATM-LMDS wireless loop.Analysis of delay and throughput in ATM-LMDS fading channel, using adaptive rate coding techniques. Assessing effects of adaptive transmission rate on the interference level of ATM-LMDS cellular architecture.