| Popis: |
Wireless sensor networks (WSNs) nodes are usually battery powered, which becomes the bottleneck of their widespread applications. Therefore the design of low power consumption for WSNs has drawn great attention among researchers. Since the WSN transmission scheme largely determines the energy performance of the entire networks, we introduce two efficient modulation scheme-Frequency shift key (FSK) and On-Off Frequency shift key (OOFSK) into WSNs. In order to analyze and compare the energy performance between the two different transmission schemes, we establish a basic communication model and obtain their energy performance indicators as well as the variable trend of the indicators. The numerical results reveals that the OOFSK transmission can achieve a better energy performance than the FSK transmission with low signal to noise ratio and small OOFSK modulation duty cycle. In the further analysis of simulation results, different application situations of OOFSK and FSK are discussed and concluded, which has positive effect on modulation scheme design of low power consumption WSNs. |
