自适应调制结合功率控制的WSN节能方案

A WSN Energy Saving Scheme Based on Fusion of Adaptive Modulation and Power Control

针对无线传感器网络的能耗问题,提出了基于自适应调制和功率控制的节能方案。首先,描述自适应调制无功率控制方案(AM无PC),使用简单封闭形式近似M-QAM加性高斯白噪声(AWGN)信道的误码率(BER)函数。然后,提出了一种简单的自适应调制与功率控制方案(AM与PC2),以延长WSN的网络寿命,接收的信噪比在两个相邻的切换阈值内增加,降低了传输功率以实现节能。最后,通过数值计算表明,提出的方案可减少更多的平均传输功率,并保持目标BER。仿真结果表明,相比其他几种较新的方案,提出的方案实现了更高的数据包投递率和更好的网络可靠性,并延长了网络寿命。

For the energy consumption issue of wireless sensor networks, an energy conservation scheme based on power control and adaptive modulation is proposed. Firstly, an adaptive modulation without power control scheme （AM no PC） is described, and bit error rate （BER） function M-QAM additive white Gaussian noise （AWGN） channel is approximated by using a simple closed form. Then, an adaptive modulation with power control scheme （AM with PC） is proposed to prolong the network life of WSN, and the received SNR increases within two adjacent switching thresholds, which has reduced the transmission power to achieve energy saving. Finally, numerical calculations show that the proposed scheme has reduced more average transmission power and keep the objective BER. Simulation results show that proposed scheme has realized higher packet delivery ratio, better network reliability and longer network lifetime than several other advanced schemes.