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为了提高多中继系统下俩源节点进行数据交换时的性能,提出了自适应机会转发策略.在该策略中,根据2个源节点反馈控制帧的情况,从直接传输、直接重传、单向机会中继传输和双向机会中继传输4种传输模式中选择最优的传输模式.在只有1个源节点能解码时,采用源节点重传和单向机会中继竞争的方式.由于该策略能自适应地选择最优的传输模式,因此相比较其他转发策略,可以较大地降低系统数据交换的复杂度,提高系统的中断性能和频谱效率.最后,通过理论分析和数值仿真验证了该策略的优越性.
In order to improve the performance of two source nodes in multi-relay system during data exchange, an adaptive opportunistic forwarding strategy is proposed.In this strategy, according to the feedback of control frames from two source nodes, from direct transmission, direct retransmission, single The optimal transmission mode is selected among the four transmission modes for opportunistic relay transmission and two-way opportunistic relay transmission, and the source node retransmission and one-way opportunistic relay competition are adopted when only one source node can decode. Therefore, compared with other forwarding strategies, the complexity of system data exchange can be greatly reduced, and the system interrupt performance and spectrum efficiency can be improved.Finally, through theoretical analysis and numerical simulation, it is verified that the strategy can adaptively select the optimal transmission mode, Strategy superiority.