Abstract: In this paper, how the Symbol Error Rate（SER）, from physical layer of Wireless Sensor Network（WSN）, influences its nodes energy consumption is discussed profoundly. Although the higher transmission symbol error rate means the less nodes energy consumption, the symbol error frame would be retransmitted to ensure an accurate signal transmission to the receiver, which thus results in more energy consumption. However, the reducing of transmission symbol error rate would also lead to the increasing of the energy consumption. To balance the symbol error rate and nodes energy consumption, a dynamic optimal solution of symbol error rate obtained in different decay modes is obtained in this paper, which, compared with traditional fixed transmission symbol error rate, optimizes the node energy consumption.

Key words: wireless sensor network, symbol error rate, decay mode, energy consumption

摘要： 研究了在无线传感网络物理层中误码率对无线传感器节点能量消耗的影响。提高传输误码率可以降低节点能量消耗，但为了保证发送端信号能准确传输到接收端，错误帧将重传，会消耗许多能量。降低传输误码率则会增加节点能量消耗。为了平衡误码率对节点能量消耗的作用，在不同衰减模式下得到误码率的动态最优解，和传统的采用固定误码率传输信号相比，节点能量消耗得到很大优化。

关键词: 无线传感网络, 误码率, 衰减模式, 能耗