摘要
协同通信中,中继节点通常用来转发源节点的数据分组。但是从中继节点的角度出发,帮助其它节点转发数据会降低其自身的性能,导致中继低效率问题的出现。针对此问题,该文基于网络编码设计了一种适用于无线Ad hoc网络的协同MAC协议。该协议将网络编码和协同机制相结合,在需要协同传输时,利用网络编码让中继节点在发送源节点数据的同时也发送自身的数据,利用网络编码来解决协同传输中中继低效率问题,进一步提升协同传输的性能。该文还在2维Markov退避模型的基础上,加入了网络编码和协同机制,对所提协议在多跳网络中进行了吞吐量性能分析,并探讨了网络节点数、多跳和信道质量对吞吐量性能的影响。仿真结果表明,相比一般的协同MAC协议,采用网络编码的协同MAC协议可以显著的改善系统性能,是解决协同传输中的中继低效率问题的有效手段。
In cooperative communication, the relay node is used to retransmit the data packets of the source. However, helping other nodes transmitting packets may decrease the performance of the relay, it is less efficient from the point of the relay, which is called the relay inefficient problem in cooperative communication. In order to resolve this problem, a cooperative MAC is proposed based on network coding for Ad hoc networks. The proposed protocol combines the network coding and cooperative communication and allows a relay to use the cooperative retransmission to deliver its own data packets as well. Such a special scheme resolves the relay inefficient problem by network coding and improves the system performance as well. Moreover, the proposed protocol is modeled by a modified Markov chain in the multihop networks, in which considers the cooperative communications and the network coding. Furthermore, the impacts of multihop and channel condition for the system performance are also discussed in this paper. The simulation results show the proposed protocol can significantly improve the system performance compared with the general cooperative MAC and the network coding is really efficiency to resolve the relay inefficient problem in cooperative communication.
出处
《电子与信息学报》
EI
CSCD
北大核心
2011年第12期2971-2977,共7页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60972051)
东南大学移动通信国家重点实验室开放研究基金(2010D09)
国家科技重大专项(2010ZX03006-002-04)资助课题
