Wireless Sensor Networks (WSNs) , which has been widely used in the practical systems, is one of the new research areas in information technology. The transmission scheme,which is used in WSNs, determines the transmission reliability and battery power efficiency of the WSNs. That is, transmission scheme is one of the key factors for the system performance of WSNs. In order to a-nalysis and compare Frequency-Shift-Keying ( FSK) and On-Off-Frequency-Shift-Keying(OOFSK), which have been widely used in WSNs, more efficiently in WSNs, we presents a method of comparing the comprehensive performances of WSNs nodes with FSK or OOF-SK, when WSNs nodes are powered by battery. We analysis the performances of FSK and OOFSK with the view point of bit error rate and battery efficiency. From the numerical results, we find that OOFSK can achieve better comprehensive performance than FSK for some signal to noise ratio conditions, and the comprehensive performance gain of OOFSK becomes higher significantly when the duty factor v of OOFSK modulation gets lower. In addition, as for comprehensive performance gain of OOFSK, the duty factor v of OOFSK modulation has more significant impact than that of the signal to noise raito.%无线传感器网络(WSNs)是信息科学领域中一个全新的发展方向,且已经得到广泛的应用.无线传感器网络的传输体制很大程度上决定了整个无线传感器网络的数据传输可靠性和电池供电条件下的能效性能.另一方面,频移键控(FSK)和开关频移键控(OOFSK)是无线传感器网络中重要的传输方式；因此,本文提出了一种无线传感器网络节点在电池供电条件下,分析比较FSK和OOFSK误码率性能和电池能效的方法,并推导了FSK和OOFSK这两种传输体制下误码率和电池能效的综合性能对比关系.从数值分析结果可知OOFSK调制在一定的信噪比条件下,其误码率性能优于FSK调制,且综合能效性能改善随着OOFSK调制的占空比v的减小而有显著的提高.此外,OOFSK调制占空比v对综合能效性能的影响明显超过信噪比的影响.
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