Abstract
In this paper a new method to improve performance of cooperative underwater acoustic (UWA) sensor networks will be introduced. The method is based on controlling and optimizing carrier frequencies which are used in data links between network nods. In UWA channels Pathloss and noise power spectrum density (psd) are related to carrier frequency. Therefore, unlike radio communications, in UWA Communications signal to noise ratio (SNR) is related to frequency besides propagation link length. In such channels an optimum frequency in whole frequency band and link lengths cannot be found. In Cooperative transmission, transmitter sends one copy of transmitted data packets to relay node. Then relay depending on cooperation scheme, amplifies or decodes each data packet and retransmit it to destination. Receiver uses and combines both received signals to estimate transmitted data. This paper wants to propose a new method to decrease network power consumptions by controlling and sub-optimizing transmission frequency based on link length. For this purpose, underwater channel parameters is simulated and analyzed in 1km to 10km lengths (midrange channel). Then link lengths sub categorized and in each category, optimum frequency is computed. With these sub optimum frequencies, sensors and base station can adaptively control their carrier frequencies based on link length and decrease network’s power consumptions. Finally Different Cooperative transmission schemes “Decode and Forward (DF)” and “Amplify and Forward (AF)”, are simulated in UWA wireless Sensor network with and without the new method. In receiver maximum ratio combiner (MRC) is used to combining received signals and making data estimations. Simulations show that the new method, called AFC cooperative UWA communication, can improve performance of underwater acoustic wireless sensor networks up to 40.14%.
Highlights
Underwater acoustic wireless sensor networks (UWA-WLSN) become a hot topic in acoustic communications zone
The method is based on controlling and optimizing carrier frequencies which are used in data links between network nods
Simulations show that the new method, called adaptive frequency controlled (AFC) cooperative UWA communication, can improve performance of underwater acoustic wireless sensor networks up to 40.14%
Summary
Underwater acoustic wireless sensor networks (UWA-WLSN) become a hot topic in acoustic communications zone. Acoustic waves experience frequency and link length dependent Pathlosses in underwater environment. In this method link lengths are subcategorized. According to considerable progresses in radio communications, researches try to improve UWA systems by applying new schemes which are lent from radio communications One of these methods is cooperative communication which is suitable to use in wireless sensor networks. In this method, which is called ACF cooperative UWA communication, depending on link length between nodes and by performing ACF algorithm, optimum frequency for each path is defined. This paper’s Simulations show that ACF cooperative UWA communication scheme can improve performance of UWA-WLSNs up to 40.14%
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