Research and Development of MIMO-OFDM Mesh Network

这是一个MIMO网状网络的研发研究项目，该网络由多个中继节点配备MIMO天线，以多跳方式中继数据包。在研究MIMO收发器设计、资源分配、节点同步、网络编码和协同中继的基础上，建立了适用于网状网络各层的协议，并开发了演示系统。通过对传输性能的评估，我们证实了该系统的优势，与基于CSMA/CA的传统多跳中继协议相比，该系统的可实现吞吐量增加6倍，数据包延迟显著降低。我们还提出了一种自适应无线资源分配方案，即使在不均匀的网络拓扑中也能保持所提出系统的有效性。在演示系统中，我们实现了图形数据的双向中继，这也证明了所提出同步方案的有效性。此外，在室内环境下设置3个中继节点的实验结果，实际证实了双向中继的优越性。

This is an R&D research project of MIMO mesh network which consists of multiple relay nodes equipped with MIMO antenna to relay packets in a multi-hop manner. Based on investigation of MIMO transceiver design, resource allocation, node synchronization, network coding and cooperative relay, we established protocols for different layers of the mesh network and developed a demonstrator system. Through evaluation of transmission performance, we confirmed superiority of the proposed system to achieve a 6 times gain in achievable throughput and significant packet delay reduction in comparison with conventional multi-hop relay protocols based on CSMA/CA. We also proposed an adaptive wireless resource allocation scheme to maintain the effectiveness of the proposed system even in non-uniform network topology. In the demonstrator system, we realized two-way relay of graphic data, which is also a proof for the effectiveness of the proposed synchronization scheme. Furthermore, experiment results with a setup of 3 relay nodes in an indoor environment practically confirmed the superiority of two-way relay.