采用喷泉码的无线协同多跳信息累积广播协议

Cooperative Multi-hop Broadcast Protocols Using Fountain Codes for Wireless Networks

为提高无线多跳广播的能量效率,提出了采用喷泉码的协同多跳信息累积广播协议:令注水速率最大的节点进行发送,其发送功率由传输速率和注水速率决定。当有接收节点成功接收时,再由更新后注水速率最大的节点发送。各发送节点采用不同的喷泉码进行编码,使接收节点获得复用增益,并且节点可以接收可靠传输范围以外的信息并进行累积直至成功译码。根据节点是否掌握全局网络信息,给出了集中式信息累积启发算法和分布式信息累积算法,并且将本协议与现有的能量累积协议进行了比较,仿真结果表明所提协议在能量效率上有较大的提高。

In order to improve the energy efficiency of broadcast protocols for wireless networks, cooperative multi-hop information accumulated broadcast protocols based on fountain codes are proposed in this paper. Node which has the largest fill rate transmits the information to other nodes that doesn＇t complete reception. Transmit power is determined by the transmission rate and fill rate. Fill rate of all nodes is recomputed if there is one more node receiving the information successfully and then the node has the largest fill rate is chosen to transmit. The transmitters use different fountain codes, so receivers enjoy multiplex gain. Nodes beyond the nominal range of a transmitter can accumulate the information of unreliably receiving overheard signals till complete reception. According to the situations that the nodes have global network information or not, information accumulates centralized heuristic protocol and information accumulates distributed protocol are proposed in this paper. Simulations show that the proposed protocols work more efficiently compared with the existing energy accumulate protocols.