NeTS-NoSS: Cooperative Communication for Wireless Sensor Networks

该项目的目标是研究多跳无线传感器网络的链路和路由协议，该网络使用一种称为机会主义大阵列(OLAS)的协作传输类型。OLA是一大组简单、廉价的中继器或转发节点，它们彼此之间的行为没有协调，但它们自然地一起发射，以响应从单个来源或另一个OLA接收的能量。每个节点只有一个天线，但是由于节点在空间上是分开的，它们共同提供多径衰落的分集保护，它们可以获得多输入多输出(MIMO)系统的频谱效率。已有研究表明，在充分条件下，OLA在广播过程中形成覆盖整个网络的同心环。即使在泛洪整个网络的情况下，OLAnetworks在理论上也比传统的多跳网络具有显著的优势，传输能量更低，节点复杂度更低，连通性更好，端到端延迟更短。减少的能量消耗意味着传感器电池更持久。该方案将通过将洪水限制为更像一条河流，更多节点宽，利用环形结构将消息引导到汇点，进一步降低OLA网络的能量消耗。开发的协议将利用OLAS内的分集和空间复用之间的权衡来实现连接，同时最大限度地提高吞吐量。OLA链路层协议将使河流能够绕过障碍物，例如阻塞或被摧毁的节点集群，并解决河流碰撞的情况。

The goal of the project is to investigate link and routing protocols formulti-hop wireless sensor networks that use a type of cooperativetransmission called opportunistic large arrays (OLAs). An OLA is a largegroup of simple, inexpensive relays or forwarding nodes that behavewithout coordination between each other, but they naturally fire togetherin response to energy received from a single source or another OLA. Eachnode has just one antenna, however because the nodes are separated inspace, they collectively provide diversity protection from multipathfading and they can reap the spectrum efficiency of amultiple-input-multiple-output (MIMO) system. It has been shown that undersufficient conditions during broadcast, OLAs form concentric rings thatcover the whole network. Even when flooding the whole network, OLAnetworks have been shown theoretically to have significant advantages overconventional multi-hop networks in terms of reduced transmit energy, lowernode complexity, better connectivity, and shorter end-to-end delay.Reduced energy consumption means sensor batteries last longer.The project will further reduce the energy consumption of OLA networks bylimiting the flood to be more like a river, many nodes wide, exploitingthe ring structure to guide a message up to the sink. Developed protocolswill exploit the trade-off between diversity and spatial multiplexingwithin OLAs to achieve connectivity while maximizing throughput. OLA linklayer protocols will enable the river to flow around obstacles such asblockages or clusters of destroyed nodes, and resolve the situation whenrivers collide.