Abstract
Cruising sensor nodes have an attractive application in monitoring liquid-based industrial environments. A cruising sensor node, equipped with various sensors, is self-propelled so that they can “cruise” to specified area to gather scientific data. The cruising sensor network consists of an array of such cruising nodes to perform collaborative monitoring task over a given area. A reliable and high-speed underwater acoustic (UWA) communication scheme is necessary for node-to-node communication. Most of the industrial liquid reservoirs are confined spaces, including large oil tanks and nuclear storage ponds. The communication in confined underwater space will suffer more severe multipath interference caused by numerous reflections from boundaries. Conventional orthogonal frequency-division multiplexing (OFDM) technique has poor performance in this channel. Instead, spread spectrum orthogonal frequency-division multiplexing (SS-OFDM), which applies spread spectrum technique into OFDM, has better performance in such severely multipath fading underwater channels. However, the spread spectrum process causes a huge waste in the spectrum efficiency. In order to enhance the transmission efficiency, a mapping sequence spread spectrum OFDM (MSSS-OFDM) method is proposed in this paper. The simulation and experimental results show that our scheme is a robust and spectrum efficient communication method for confined underwater space.
Highlights
A cruising sensor network takes charge of monitoring liquidbased industrial environments such as large oil tanks, nuclear storage ponds, and drinking water reservoirs
The simulation and experimental results show that the bit error rate (BER) performance of SSOFDM has significantly better outcome than conventional orthogonal frequency-division multiplexing (OFDM) scheme
We can see that mapping sequence spread spectrum (MSSS)-OFDM can greatly improve the system performance in confined underwater acoustic (UWA) channels compared to OFDM
Summary
A cruising sensor network takes charge of monitoring liquidbased industrial environments such as large oil tanks, nuclear storage ponds, and drinking water reservoirs. Direct sequence spread spectrum (DSSS) technique has gained considerable attention in UWA communication for its low interception probability and inherent interference rejection, and for its relative immunity from multipath interference [2,3,4]. The OFDM structure is simple due to modulation and demodulation process can be implemented by fast Fourier transform (FFT) Both DSSS and OFDM have great potential to combat multipath interference in UWA communication. SS-OFDM shows a robust communication scheme in confined UWA channels. The shorter CP in SS-OFDM contributes to enhancing the data rate, the spread spectrum process jeopardizes the system bandwidth and reduces spectrum efficiency [9]. We adopt mapping sequence spread spectrum (MSSS) scheme in SS-OFDM system to construct MSSS-OFDM system.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Distributed Sensor Networks
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
