Abstract
Energy consumption is one of the major problems in the development of Wireless Sensor Network (WSN). Under certain application conditions, Free Space Optical (FSO) communication can effectively reduce system energy consumption. Combining the need of the short-distance communication in the cooperative control of the mobile robot, this paper focuses on the study for the infrared FSO communication method and devices. Eight infrared-transmitting and receiving modules with the angular spacing 45° were deployed to realize the omnidirectional communication. The systematic measurement shows that the designed communication system can effectively carry out data transmission within a distance of 14 meters when the bit error ratio (BER) is 0%. Through the link budget analysis, the theoretical transmission distance of the design system is about 24 meters, only accounting for 60% of the communication module data manual, and the BER rises rapidly as the distance increases. The analysis of the oscilloscope observation results indicates that due to the attenuation caused by each medium (mainly moisture, dust, etc.) in the propagation path, the BER rapidly increases when the distance increases. Therefore, based on the test results, this system is applicable for constructing a short-distance wireless sensor network to meet the needs of cooperative control of mobile robots, without involving the complicated pointing process.
Highlights
Energy consumption is one major issue in Wireless Sensor Network (WSN)
The energy consumption of WSN is mainly concentrated on data processing, communication and routing, and voltage and current conversion devices, among which the energy consumption of the communication part may account for 70% or more of the entire system
It can be seen thatBER is half of the sum of the error probabilities on the logic 0(P0), because the received voltage level is greater than the receiver voltage threshold, and there is an error probability on logic 1 (Pt) when the received voltage level is less than the receiver voltage threshold
Summary
Energy consumption is one major issue in WSN. The energy consumption of WSN is mainly concentrated on data processing, communication and routing, and voltage and current conversion devices, among which the energy consumption of the communication part may account for 70% or more of the entire system [1] Typical WSNs generally use RF for data transmission [2], which makes their overall energy consumed mainly by these radio frequency (RF) communication modules [3]. One design based on FSO transmission medium was proposed: the changes in intensity and wavelength emitted by the light emitter are used to define information for the recipient. This proposed design still adopts theanalogy system, which is too complex to apply. The studies on Laser-based FSO have been conducted [11], [12], [15], but the main problem with lasers is the directivity of light from the emitter to the receiver. TSAL6200 was selected as the data transmission module, and HS0038B as receiver module
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