基于SWIPT的协作中继系统动态时间分配策略

Dynamic time allocation strategy in SWIPT cooperative relay system

无线信息与能量同步传输技术为通信系统中能量受限型节点提供了解决方案,可延长节点生命周期。为研究时间分配对系统中断性能的影响,针对采用解码转发策略的SWIPT协作中继系统,研究构建系统信道容量模型,在满足系统最低传输速率的约束下,提出一种中继动态时间分配策略来优化传输。该策略首先对系统目的端节点的中断概率进行分析,推导得出系统中断概率与时间分配系数之间关系的表达式,然后以最小化中断概率为目的构建优化求解模型,利用迭代算法得到问题的解。仿真结果表明,与现有的传输策略相比,动态时间分配策略可以显著减少系统中断概率,能较好地改善系统传输性能,保障系统的可靠运行。

Simultaneous Wireless Information and Power Transfer(SWIPT) technology provides a solution for energy-constrained nodes in communication systems to extend the life cycle of nodes. In order to study the impact of time allocation on system interruption performance, a SWIPT cooperative relay system using Decode-Forward(DF) strategy is studied to construct a system channel capacity model. Under the constraint of the minimum transmission rate of the system, a dynamic relay time allocation strategy is proposed to optimize transmission. Firstly, the outage probability of the destination node is analyzed, and the expression of the relationship between the outage probability and the time allocation coefficient is derived. Then, the optimal solution model is constructed with the aim of minimizing the outage probability, and the iterative algorithm is used to obtain the solution of the problem. The simulation results show that compared with the existing transmission strategies, the dynamic time allocation strategy can greatly reduce the probability of outage probability, improve the transmission performance of the system and ensure the reliable operation of the system.