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为了提高协作中继系统能量效率,提出了一种节能的跨层设计方法.在Nakagami-m衰落信道中,通过物理层自适应调制和链路层混合自动重传请求(HARQ)协议跨层设计,首先建立HARQ状态转移图,推导协作中继系统平均总能耗和中断概率表达式,然后提出最小化系统平均总能耗的跨层优化模型,并给出该跨层优化模型的穷尽搜索算法,最后对比分析了非协作HARQ和协作HARQ协议下的中继系统能耗特性.仿真结果表明,协作HARQ比非协作HARQ更节能,且通过自适应调节星座尺寸b的大小,最多可节省80%的能量.
In order to improve the energy efficiency of collaborative relay system, an energy-saving cross-layer design method is proposed.At the Nakagami-m fading channel, through the physical layer adaptive modulation and the link layer hybrid automatic repeat request (HARQ) protocol cross-layer design , First establishes the HARQ state transition diagram, derives the average total power consumption and the probability of interruption in the cooperative relay system, then proposes a cross-layer optimization model to minimize the average total energy consumption of the system and gives an exhaustive search algorithm of the cross-layer optimization model Finally, the power consumption characteristics of the relay system under non-cooperative HARQ and cooperative HARQ are compared and analyzed.The simulation results show that cooperative HARQ is more energy-efficient than non-cooperative HARQ and can save up to 80% by adaptively adjusting the size of constellation b, energy of.