[PDF] Top 20 Environmental equalizer for underwater communications

... an environmental-based equalization algorithm for underwater ...simple communications system, but it loses performance in the presence of geometric mismatch between the probe-signal and the actual ... See full document

... Spatial environmental diversity could be tackled almost at the hydrophone level ...the underwater acoustic channel in a method called Time Reversal (TR) [1], [2] that was shown to efficiently focalize a ... See full document

... Feedback Equalizer (DFE) technique for time-variant underwater ...rate communications between a moving source and/or a moving receiver array, ... See full document

... c) Multichannel Combining: Table II provides MSE values for joint time reversal using estimated probes and the simplified MC algorithms of Section III, as well as the DDPPC approach of [7] with impulse response snapshots ... See full document

... Feedback Equalizer (DFE) for underwater communications between a moving source and a fixed receiver array (implying a range change) ...for Underwater Acoustic Network (UAN) project, is called ... See full document

... and environmental parameters of the acoustic ...only environmental parameters, such as sound speed and surface roughness has been tested as relatively stable in ...than environmental parameters, on ... See full document

... Rapid Environmental Assess- ment) sea trial was conducted in the continental shelf off the west coast of Portugal in April 2004, in an area to the north of the Set´ubal Canyon ...waveforms. Environmental ... See full document

... for underwater communication ...different environmental variations and in order to compensate for these environmental effects efficiently it is necessary to separate each arrival and minimize the ... See full document

... When there is no parameters estimation error the channel impulse response is known and in the detector Pe ≈ 0 for SNR>0dB as it was expected theoretically for a maximum likelihood detector. When only an estimate of ... See full document

... Figure 6(a) shows the pTR output SNR computed via the MSE at the detector input with (21), for the first 3 seconds of data during shot 7. One can see a progressive degradation in performance due to ... See full document

... A abordagem ´ e a de mitigar os efeitos do ru´ıdo na identifica¸c˜ ao do canal para o proces- sador Passivo de Tempo-Reverso (PTR), que ´ e uma t´ ecnica de baixa complexidade de retro-focagem para reduzir a dispers˜ ao ... See full document

... 1,2 underwater acoustic communications has increased due to their several ...autonomous underwater vehicles (AUV) undetected while communicating to other submarines, surface vessels, or ... See full document

... Tab. 4 provides similar data for passive time rever- sal, followed by single channel equalization. Residual MSE values are larger than those of Tab. 3, particularly for Q1 packets, due to long-term residual intersymbol ... See full document

... receive communications handled in a collective ...Group communications are also easy to handle on the sender side because a simple invocation can trigger several communica- ... See full document

... legal, environmental and indigenous matters and even in the areas of economics and politics, still worked in the same areas but on the other side of the ... See full document

... the emitting node is moving during message transmission, thus contributing to a faster loss of coherence of the probe signal. In order to mitigate source-receiver movement impulse response frequency shifting (FS) is ... See full document

... An important need related to D2D communications involves the discovery of devices. The mechanism provided by 3GPP Proximity Services (ProSe) [4] enables devices to discover each other based on proximity. Then, ... See full document

... We can say that the appearance of territorial-state and its bureaucratic apparatus depended in the greatest measure upon the technical advance and the evolution in the land transportation – the appearance of railway ... See full document

... Unmanned Underwater Vehicles (UUVs) have many components that generally include mechani- cal, automatic controllers design and optimal path planning ...Autonomous Underwater Vehicles (AUVs) in unknown ... See full document

... visit underwater cultural and natural structures, acting as an excellent tool for environmental education and a powerful device for successful management, since it is able to raise environmental ... See full document