Proposed long-distance communication in sensor network using weak radio waves and DSP

When we try to use a sensor network outdoors, for purposes such as collecting information related to large-scale natural disasters and agricultural applications, it often happens that the communication distance is insufficient. Many sensor network users in Japan utilize sensor nodes that use 2.4 GHz frequency. The communication distance of these sensor nodes is short (a few hundred meters). Therefore, to achieve long-distance communication, sensor network users need relay nodes. However, these relay nodes might cause an increase in cost, complexity, and needs for maintenance. Therefore, in this paper, we propose long-distance communication nodes. It is realized in the application of longdistance communication technology developed by Mathematical Assist Design Laboratory[1]. This technology is necessary to use PC(Large and high power consumption) for the decipherment because this technology demands a lot of resources. So, we solve the problem of size and power consumption using DSP.