Multiple information collection with frequency offset compensation by utilizing physical wireless parameter conversion sensor network (PHY-C SN)

Information collection in wireless sensor network is applied to various application such as home automation, smart grid, environmental monitoring and so on. However, it takes much time to collect information from multiple sensor nodes by packet communication. In order to collect sensing information rapidly, physical wireless parameter conversion sensor network (PHY-C SN) has been studied. In PHY-C SN, the sensing information is converted to correspond subcarrier numbers of orthogonal frequency division multiplexing (OFDM) signals and the positional information is converted to time slot for transmitting. Fusion center which is an information collection node can receive multiple OFDM subcarriers simultaneously. Therefore, easier and faster information collection can be realized in PHY-C SN. However, only a kind of information collection in PHY-C SN has been studied. Thus, the method to collect various information in PHY-C SN is proposed in this paper. Moreover, frequency offset compensation in the proposed method is also considered. The effectiveness of the proposed method is evaluated by computer simulation.