无线网络中的多跳协作机制*

现有的协作机制过度地依赖于信道状态信息,而无线信道状态瞬时变化,使得信道状态信息在实践中很难获取。提出一种新的多跳协作机制,该机制不依赖信道状态信息,而是充分利用无线网络的广播特性,使得系统中的节点缓存其前面节点发送的信号,并对接收到的信号进行最大比合并,恢复原信号再转发。通过理论分析以及仿真分析验证所提方案的可行性和有效性,并与多跳非协作机制进行比较,仿真结果表明,多跳协作机制可以获得额外的分集增益,有效地提高了交付率以及增大系统中的端到端的平均吞吐量。

New multi-hop cooperation mechanism for wireless networks

The existing cooperation mechanism for wireless networks excessively depends on the channel state information. However, it is difficult to obtain the channel state information in practice bacause wireless channel state instantaneously changes. This paper proposed a new multi-hop cooperation mechanism(MCM) for wireless networks, which did not depend on the channel state information. MCM made use of inherently broadcast characteristics of wireless channel, so that enabled the intermediate nodes to cache and combined signals that were sent by the preceding nodes in a relay chain, and forwarded the recovered signals. And it employed theoretical analysis and simulation analysis to prove the feasibility and effectiveness of the proposed scheme. The results show that the MCM can improve the packet delivery ratio and the average end-to-end throughput compared to the multi-hop non-cooperation mechanism (MNM).