Assuming non-ideal circuit power consumption at the energy harvesting (EH) nodes, we propose two practical protocols that optimize the performance of the harvest-then-transmit wireless powered communication networks (WPCNs) under two different objectives: (1) proportional fair (PF) resource allocation, and (2) sum rate maximization. These objectives lead to optimal allocations for the transmit power by the base station (BS), which broadcasts RF radiation over the downlink, and optimal durations of the EH phase and the uplink information transmission phases within the dynamic time-division multiple access (TDMA) frame. Compared to the max-sum-rate protocol, the PF protocol attains a higher level of system fairness at the expense of the sum rate degradation. The PF protocol is advantageous over the max-sum-rate protocol in terms of system fairness regardless of the circuit power consumption, whereas the uplink sum rates of both protocols converge when this power consumption increases.
翻译:假设能源收获节点的非理想电路电能消耗,我们提出两个切实可行的协议,在两个不同目标下优化收成前传输无线电源通信网络(WPCN)的性能:(1) 比例公平(PF)资源分配,(2) 总电速最大化。 这些目标导致基站(BS)对输电量进行最佳分配,该站对下行链路进行RF辐射广播,EH阶段和在动态时分多重接入(TDMA)框架内的上链信息传输阶段的最佳期限。 与最高总和协议相比,PF协议在以总速下降为代价的情况下实现了更高水平的系统公平性。 从系统公平性角度来看,无论电路用量如何,PF协议优于最高总电价协议,而当电力消耗增加时,两个协议的上链总和率会趋同。