Effect of an extra‐tropical hurricane on the underwater acoustic environment

2001 ◽  
Vol 110 (5) ◽  
pp. 2635-2635
Author(s):  
Daniel Hutt ◽  
John Osler ◽  
James Abraham
Keyword(s):  
Underwater Acoustic ◽  
Acoustic Environment

scholarly journals RSS-Based Target Localization in Underwater Acoustic Sensor Networks via Convex Relaxation

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2323 ◽  
Author(s):  
Shengming Chang ◽  
Youming Li ◽  
Yucheng He ◽  
Yongqing Wu
Keyword(s):  
Sensor Networks ◽  
Weighted Least Squares ◽  
Convex Relaxation ◽  
Target Localization ◽  
Superior Performance ◽  
Transmit Power ◽  
Underwater Acoustic ◽  
Acoustic Environment ◽  
First Case ◽  
Second Order Cone

The received signal strength (RSS) based target localization problem in underwater acoustic wireless sensor networks (UWSNs) is considered. Two cases with respect to target transmit power are considered. For the first case, under the assumption that the reference of the target transmit power is known, we derive a novel weighted least squares (WLS) estimator by using an approximation to the RSS expressions, and then transform the originally non-convex problem into a mixed semi-definite programming/second-order cone programming (SD/SOCP) problem for reaching an efficient solution. For the second case, there is no knowledge on the target transmit power, and we treat the reference power as an additional unknown parameter. In this case, we formulate a WLS estimator by using a further approximation, and present an iterative ML and mixed SD/SOCP algorithm for solving the derived WLS problem. For both cases, we also derive the closed form expressions of the Cramer–Rao Lower Bounds (CRLBs) on root mean square error (RMSE). Computer simulation results show the superior performance of the proposed methods over the existing ones in the underwater acoustic environment.

scholarly journals Stochastic Network Calculus Model for Delay Distribution of Time Division Multiple Access and Carrier Sense Multiple Access in Underwater Acoustic Wireless Communication

2021 ◽  
Vol 11 (4) ◽  
pp. 2885-2901
Author(s):  
M. Saravanan ◽  
Rajeev Sukumaran ◽  
M.R. Christhuraj ◽  
T.T. Manikandan
Keyword(s):  
Wireless Communication ◽  
Multiple Access ◽  
Data Communication ◽  
Data Traffic ◽  
Carrier Sense Multiple Access ◽  
Access Methods ◽  
Underwater Acoustic ◽  
Acoustic Environment ◽  
Carrier Sense ◽  
Time Division

Underwater Acoustic wireless communication becomes a popular research area for transmitting and receiving data between the communicators in the ocean environment. High accuracy in data communication can be succeeded by proficient modeling of carrier sense multiple access and time division access. For such innovations, the system has to proceed with an appropriate framework to make constant data traffic and limitations on start to finish data traffic delays. There are two major wireless communication multiple access methods that can be utilized in real-time underwater networks. One of the multiple access schemes is TDMA and another one is CSMA/CA. This paper concentrated on the modeling of TDMA and CSMA/CA also proposes the comparison of delay (end-end) of both multiple access protocols. The results using SNC to obtain delay bounds and are associated with simulation. The results show TDMA has a lesser efficiency than CSMA/CA in the acoustic environment.

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