CISE Research Resources: Reconfigurable Multi-Node Wireless Communication Testbed

EIA 0224410PI(S)：Wong，Tan F.Fang，Yuguang；Shea，John M.机构：佛罗里达大学标题：CESE RR：可重构多节点无线通信试验该方案开发了一个由6个可重构收发节点组成的实时无线通信试验台，这些节点工作在900 MHz或2.4 GHz ISM频段，使得能够进行网络协议和通信技术的实验。该基础设施在真实的无线通信信道上进行了实时实验，实现了三个项目：协同通信、无线媒体访问控制协议设计与实验和基于可靠性的混合ARQ。第一个项目涉及无线网络中多个节点之间的协同发送和接收。分别采用分布式空时编码和分布式迭代译码技术实现发射分集和接收分集。第二个项目使用试验台来测试新的媒体访问控制(MAC)协议，该协议采用了一组退避算法，旨在避免潜在的“未来”冲突并减少空闲时隙的百分比。这些MAC协议具有快速解决冲突的优势，因此提供了更高的吞吐量。最后一个项目开发和研究了一种新的混合自动重传请求(ARQ)方案，该方案可以利用软输入、软输出(SISO)解码器产生的可靠性估计。该ARQ方案发送针对不可靠比特的附加信息，并且该信息被用于进行附加解码。该实验台将在真实信道上进行实时实验，以检验该ARQ方案的吞吐量和时延性能，并通过仿真进行评估；在教育方面，该平台为本科生提供综合设计培训。在对研究项目开发的算法进行模拟研究时，学生将使用试验台在真实的通信通道上进行离线实验，以确定基于理论模型开发的算法可能存在的弱点，然后对算法进行微调，以产生实时的FPGA实现。

EIA 0224410PI(s): Wong, Tan F. Fang, Yuguang; Shea, John M.Institution: University of Florida Title: CISE RR: Reconfigurable Multi-Node Wireless Communication Testbed This proposal, developing a real-time wireless communication testbed of six reconfigurable transceiver nodes that operate in the 900MHz or 2.4GHz ISM band, enables conducting experiments on network protocols and communications techniques. Performing real-time experiments over real-life wireless communication channels, the infrastructure enables three projects.Collaborative Communications,Wireless Medium Access Control Protocol Design and Experiments, andReliability-Based Hybrid ARQ.The first project concerns collaborative transmission and reception among multiple nodes in a wireless network. Techniques of distributed space-time coding and distributed and iterative decoding will be employed respectively to achieve transmit and receive diversity. The second project uses the test-bed to test new medium access control (MAC) protocols that employ a set of back-off algorithms designed to avoid potential "future" collisions and reduce the percentage of idle slots. These MAC protocols have the advantage of fast collision resolution and hence give much higher throughput. The last project develops and investigates a new hybrid automatic repeat request (ARQ) scheme that can take advantage of reliability estimates generated by soft-input, soft-output (SISO) decoders. This ARQ scheme transmits additional information for the unreliable bits, and this information is used to do additional decoding. The test-bed will be utilized to perform real-time experiments on a real-life channel to examine the throughput and delay performance of this ARQ scheme, which can be evaluated via simulations otherwise.On the educational side, the platform provides integrated design training to undergraduate students. Conducting simulation studies on algorithms developed on the research projects, students will employ the test-bed to perform off-line experiments over a real communication channel to identify possible weaknesses of the algorithms developed based on theoretical models and then fine tune the algorithms to produce a real-time FPGA implementation.