目前, 对于无线传感网节点能量受限问题的研究,主要以平均每 bit 电池能耗作为性能评价标准.以电池供电的采用开关键控 (on-off keying, OOK) 调制的发射机为研究对象, 考虑基于瞬时放电电流 (instaneous discharge current, IDC) 与平均放电电流 (average discharge current, MDC) 两种非线性电池利用率模型, 在瑞利信道中保证指定误码率的条件下, 推导两种模型下电池能耗性能的解析表达式.在此基础上理论分析了归一化电池利用率因子和节点距离对电池能耗性能的影响,并用仿真实验验证了两种电池利用率模型下的能耗均随归一化电池利用率因子和节点距离的增大而增大.基于IDC的电池利用率模型对应更大的电池能耗.当归一化电池利用率因子和节点距离较大时,两种模型的能耗显著高于理想电池. 当 $\gamma =0.015$, $d=90$m 时,基于IDC电池利用率模型的能耗相比理想电池增加了近 60%,而基于MDC电池利用率模型的能耗增加了25%.

The average battery energy consumption per bit is now used as performance metric for research on energy constraint in wireless sensor networks (WSNs). This paper proposes an on-off keying (OOK) transmitter with an instaneous discharge current (IDC) based battery utilization factor (BUF) model or an average discharge current (MDC) based BUF model, and derives the analytical expression of the battery energy consumption per bit for the two models under Rayleigh channel with specified symbol error rate (SER). On this basis,the impact of the battery parameter and distance on the energy consumption per bit is analyzed through a theoretical approach. Simulation results indicate that the energy consumption per bit for both models increases as battery parameter and distance increase and that theIDCbased BUF model corresponds to larger battery energy consumption per bit. When the battery parameter and distance are large, the energy consumption per bit of the two models is significantly higher than that of the ideal battery. When $\gamma $=0.015 and $d$=90 m, the energy consumption per bit for theIDCbased BUF model is nearly 60% higher than that of ideal battery, while the energy consumption per bit forMDCbased BUF model is about 25% higher.