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文中提出了一种新的多中继协作通信策略,该策略基于Jackson排队模型同时对物理层(physicallayer,PHY)与媒体接入控制层(MAC)的跨层设计进行了分析.在物理层,重点探讨多中继节点情形下信噪比(SNR)门限与中断概率之间的关系.在MAC层,系统采用Jackson排队网络进行建模,单协作节点数据包排队准则为GI/M/1模型,多节点之间进行相互机会协作,进而分析了所提策略的系统吞吐量与时延性能.跨层设计仿真结果表明,在不同中继策略下,协作节点数的增加将影响物理层高频谱有效性区域的系统中断性能.此外,相对于传统两协作节点模型,所提策略可以达到显著的MAC层数据包吞吐量与时延性能.
This paper presents a new multi-relay cooperative communication strategy based on the Jackson queuing model to analyze both the physical layer (PHY) and the media access control layer (MAC) cross-layer design.At the physical layer, The relationship between signal-to-noise ratio (SNR) threshold and the probability of outage under multi-relay node is discussed in detail. At the MAC layer, the system uses the Jackson queuing network to model the queuing network, and the queuing criterion for single cooperative node is GI / M / 1 , Multi-node mutual cooperation between the opportunities, and then analyzed the system throughput and delay performance of the proposed strategy.The simulation results show that under different relay strategies, the increase in the number of cooperative nodes will affect the physical layer of high-frequency spectrum In addition, compared with the traditional two-node model, the proposed strategy can achieve significant MAC layer packet throughput and delay performance.