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Saliency was overlooked by most of the conventional block compressed sensing (BCS). Actually, image blocks belong to salient region need more measurements while less measurements can meet the need of image blocks that are not salient when considering about observation in BCS. In this paper, an adaptive image compression based on compressed sensing is proposed. The observation matrix is designed according...
Underwater Wireless Sensor Networks (UWSNs) are expected to support a variety of civilian and military applications. In UWSNs, Medium Access Control (MAC) protocol has attracted strong attention due to its potentially large impact to the overall network performance. Unlike terrestrial networks, which mainly rely on radio waves for communications, UWSNs utilize acoustic waves, which pose a new research...
With the characteristics of high ambient noise level, very narrow bandwidth, low carrier frequency, enormous propagation latency and time-space-frequency variant multipath effect, the stochastic ocean channel is very complex and difficult to achieve reliable UWA communications. The study of transmission characteristics is an important but weak link in underwear acoustic communication technology, so...
Long multi-path spreads and rapid time variations are the characteristic of underwater Acoustic channel. These characteristic limits the data rate of reliable communication systems, and require sophisticated equalization and coding technique, so Turbo coder/decoder is introduced. In this paper, a model including time-varying fading, multi-path and additive noise for underwater acoustic channel is...
MAC protocol is one of the key technologies of the underwater acoustic networks. In order to improve the performance, this paper puts forward a modified multiple access protocol UTRAMACA. The protocol adopts parallel transmission mode and handshaking method that are different from tradition's. By this way, it improves channel utilization rate both in space and time, and it is simulated by the Matlab...
Underwater acoustic communication channels are generally characterized as seriously time-space-frequency variant channels with strong multi-path interference, limited bandwidth, severe environment noise and Doppler effect. Taking into account the hostile transmission condition of underwater acoustic channel, underwater communication is one of the most challenging communication technologies. Frequency-Hopping...
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