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This paper presents a novel optimal watermark decoding algorithm of multibit multiplicative watermarks using Bessel k form of density function (BKF). In the proposed algorithm, the wavelet coefficients of detail subband are assumed to obey BKF, the classical spread spectrum watermarking is used for watermark embedding, the optimal multi-bit watermark decoding comes down to a maximum likelihood (ML)...
Different from terrestrial sensor networks, underwater sensor networks use acoustic channels for communication and most sensor nodes are mobile due to water current. These distinctions feature underwater sensor networks with highly dynamic topology, high bit error rate, large propagation delay, and low available bandwidth. Traditional ARQ series are not suitable due to their frequent feedbacks, which...
Underwater Acoustic Sensor Networks (UASNs) is an important and ideal information-gathering paradigm for aqueous environments. However the harsh acoustic traffic condition makes the task of efficient transmission difficult. This paper presents the bit error rate guided time limited energy optimal algorithm (TLEO) for UASNs, which resides between the network layer and the MAC layer. The main feather...
An adaptive transmission control mechanism for underwater acoustic sensor networks is proposed in this paper. This mechanism controls transmission delay and releases collisions adaptively according to different topologies and the bit error rates of the wireless links periodically feedback by the receiver. Our work succeeds in releasing collisions and reducing propagation delay. Further more, the energy...
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