1,060 resources related to Acoustic Communications
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The Optical Fiber Communication Conference and Exhibition (OFC) is the largest global conference and exhibition for optical communications and networking professionals. For over 40 years, OFC has drawn attendees from all corners of the globe to meet and greet, teach and learn, make connections and move business forward.OFC attracts the biggest names in the field, offers key networking and partnering opportunities, and provides insights and inspiration on the major trends and technology advances affecting the industry. From technical presentations to the latest market trends and predictions, OFC is a one-stop-shop.
To promote awareness, understanding, advancement and application of ocean engineering and marine technology. This includes all aspects of science, engineering, and technology that address research, development, and operations pertaining to all bodies of water. This includes the creation of new capabilities and technologies from concept design through prototypes, testing, and operational systems to sense, explore, understand, develop, use, and responsibly manage natural resources.
OCEANS 2020 - SINGAPORE
An OCEANS conference is a major forum for scientists, engineers, and end-users throughout the world to present and discuss the latest research results, ideas, developments, and applications in all areas of oceanic science and engineering. Each conference has a specific theme chosen by the conference technical program committee. All papers presented at the conference are subsequently archived in the IEEE Xplore online database. The OCEANS conference comprises a scientific program with oral and poster presentations, and a state of the art exhibition in the field of ocean engineering and marine technology. In addition, each conference can have tutorials, workshops, panel discussions, technical tours, awards ceremonies, receptions, and other professional and social activities.
The ICASSP meeting is the world's largest and most comprehensive technical conference focused on signal processing and its applications. The conference will feature world-class speakers, tutorials, exhibits, and over 50 lecture and poster sessions.
The 15th IEEE International Conference on Control and Automation (IEEE ICCA 2019) will be held Tuesday through Friday, July 16-19, 2019, in Edinburgh, Scotland. The conference is jointly organized by IEEE Control Systems Chapter, Singapore, and IEEE Control Chapter for United Kingdom and Ireland. It is technically sponsored by IEEE Control Systems Society. It aims to create a forum for scientists and practising engineers throughout the world to present the latest research findings and ideas in the areas of control and automation, and possible contributions toward sustainable development and environment preservation. The conference is featured with the Best Paper Award and the Best Student Paper Award.
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
Speech analysis, synthesis, coding speech recognition, speaker recognition, language modeling, speech production and perception, speech enhancement. In audio, transducers, room acoustics, active sound control, human audition, analysis/synthesis/coding of music, and consumer audio. (8) (IEEE Guide for Authors) The scope for the proposed transactions includes SPEECH PROCESSING - Transmission and storage of Speech signals; speech coding; speech enhancement and noise reduction; ...
The IEEE Reviews in Biomedical Engineering will review the state-of-the-art and trends in the emerging field of biomedical engineering. This includes scholarly works, ranging from historic and modern development in biomedical engineering to the life sciences and medicine enabled by technologies covered by the various IEEE societies.
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
Broadcast technology, including devices, equipment, techniques, and systems related to broadcast technology, including the production, distribution, transmission, and propagation aspects.
2016 IEEE/OES China Ocean Acoustics (COA), 2016
Shallow water acoustic channels have fast time-variance, long-time multipath spread and large Doppler shift. Their transfer characteristics are influenced by many factors, such as: the operating frequency; the acoustic characteristics of sea surface and bottom; the ocean sound speed profile; the water depth; the depth and distance between the transmitters and the receivers; the variations of channel boundary; and, subsea ...
OCEANS 2015 - Genova, 2015
Coherence under varied circumstances is compared for two classes of waveform: linear FM chirps (a conventional sonar waveform) and binary phase shift keyed messages (a conventional acoustic communications waveform). All but the waveforms' time domain structure is kept constant during the comparison. Both modeled results as well as data from a large undersea array of hydrophones are presented. Parameters considered ...
OCEANS 2016 MTS/IEEE Monterey, 2016
Modulation detection is important for underwater military communications and warfare applications. Chaotic modulations based on chaotic sequences are proposed to protect confidential underwater communications. In this paper, we develop a detection algorithm employing instantaneous phase and frequency for underwater acoustic communications. The key features derived from instantaneous phase and frequency are used to detect two chaotic modulations. They are chaotic ...
2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO), 2018
Hyperbolic frequency modulation (HFM) is Doppler insensitive. Therefore, HFM has been widely used in underwater acoustic communications as a preamble where wideband Doppler insensitivity is highly required. Based on this, we propose a new waveform named up-down-sweeping HFM (UMD-HFM). It combines an up-sweeping HFM and a down-sweeping HFM and leaves a span which is a little longer than delay spread ...
2016 IEEE 13th International Conference on Signal Processing (ICSP), 2016
Multiple-Input Multiple-Output (MIMO) systems have been widely applied to underwater acoustic (UWA) communications with promising results. However, the tradeoff between diversity and multiplexing gains in MIMO systems over underwater acoustic channel is less discussed. In this paper, a quasi- orthogonal group space-time (QoGST) scheme by combining space-time coding (STC) and layered space-time (LST) architecture is presented for better diversity and ...
Single Crystal AlGaN Bulk Acoustic Wave Resonators on Silicon Substrates with High Electromechanical Coupling: RFIC Industry Showcase
Contactless Wireless Sensing - Shyam Gollakota - IEEE EMBS at NIH, 2019
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Shallow water acoustic channels have fast time-variance, long-time multipath spread and large Doppler shift. Their transfer characteristics are influenced by many factors, such as: the operating frequency; the acoustic characteristics of sea surface and bottom; the ocean sound speed profile; the water depth; the depth and distance between the transmitters and the receivers; the variations of channel boundary; and, subsea objects. A time- varying channel impulse response has both deterministic and stochastic characteristics in a shallow water environment. Given the ocean environmental parameters, the deterministic impulse response can be calculated exactly by using underwater sound propagation models. However, it is extremely difficult to predict the stochastic impulse response due to its complexity. The method of ray tracing is quicker and more efficient than other methods such as with normal modes, parabolic equation and wave number integration in order to predict underwater water acoustic channels. At high frequencies, the ray tracing method is as accurate as others. Therefore, the ray tracing method has been widely used to simulate the channel impulse response in underwater acoustic communications. Here we focus on the impact of sea waves on the performance of single-carrier coherent underwater acoustic communications. Assuming that the sea wave is a single sinusoidal wave, we modify the BELLHOP ray module included in the Acoustic Toolbox in order to calculate the time- varying channel impulse response in a shallow water environment. Four time- varying channel impulse responses are presented for sea waves with a wave length of 50.0 m, and wave heights of 0.0, 0.5, 1.0 and 2.0 m. Furthermore, we investigate the impact of the wave height on the performance of the single- carrier coherent underwater acoustic communication system. Simulations demonstrate that bit error rates (BERs) of the system remain unchanged with time when the wave height equals 0.0 m. However, BERs change rapidly with time when the wave height is greater than 0.0 m. The higher the wave height, the faster the channel impulse response changes with time, and as a result, the higher the mean BER.
Coherence under varied circumstances is compared for two classes of waveform: linear FM chirps (a conventional sonar waveform) and binary phase shift keyed messages (a conventional acoustic communications waveform). All but the waveforms' time domain structure is kept constant during the comparison. Both modeled results as well as data from a large undersea array of hydrophones are presented. Parameters considered include bandwidth, pulse length, range from transmitter, and ray path. We find that if the ray interacts with the ocean surface, the resulting Doppler shift quickly destroys coherence for the BPSK waveform, which is highly Doppler intolerant. However, additional processing can mitigate this issue, and remote sensing with acoustic communications networks is a topic of interest.
Modulation detection is important for underwater military communications and warfare applications. Chaotic modulations based on chaotic sequences are proposed to protect confidential underwater communications. In this paper, we develop a detection algorithm employing instantaneous phase and frequency for underwater acoustic communications. The key features derived from instantaneous phase and frequency are used to detect two chaotic modulations. They are chaotic M-ary phase shift keying (CMPSK) and chaotic M-ary frequency shift keying (CMFSK), which are designed to provide confidential underwater communications. Simulation and experimental results confirm the effectiveness of our proposed algorithm for chaotic modulation detection.
Hyperbolic frequency modulation (HFM) is Doppler insensitive. Therefore, HFM has been widely used in underwater acoustic communications as a preamble where wideband Doppler insensitivity is highly required. Based on this, we propose a new waveform named up-down-sweeping HFM (UMD-HFM). It combines an up-sweeping HFM and a down-sweeping HFM and leaves a span which is a little longer than delay spread of channel. UMD-HFM not only preserves the Doppler invariance, but also can be used to estimate the instantaneous Doppler scale for underwater communication. With this simple coding structure, UMD-HFM can also demonstrate a better detection performance.
Multiple-Input Multiple-Output (MIMO) systems have been widely applied to underwater acoustic (UWA) communications with promising results. However, the tradeoff between diversity and multiplexing gains in MIMO systems over underwater acoustic channel is less discussed. In this paper, a quasi- orthogonal group space-time (QoGST) scheme by combining space-time coding (STC) and layered space-time (LST) architecture is presented for better diversity and multiplexing gains in MIMO underwater acoustic communications. Simulation results show the presented solution has better performance when compared to the Group Layered Space-Time (GLST) scheme.
Well-defined terms and measurement procedures are important for transparency in communication and repro- ducibility of results. Underwater acoustic communications is a technology and research area populated by people with different backgrounds, using different vocabularies and practices. This paper discusses a few important terms which are known to confuse people.
This paper presents a novel double-differentially coded spread-spectrum (DD- SS) system design for long-range acoustic communications (LRAC) between a moving source and a towed horizontal line array (HLA). The proposed design relies on two techniques that have been historically developed for radio- frequency terrestrial wireless communications, namely, direct sequence spread spectrum and double-differential coding. In DD-SS, direct sequence spread spectrum is employed to: 1) increase the signal-to-noise ratio; 2) suppress multipath interference; and 3) support data multiplexing, while double- differential coding makes reliable symbol recovery possible without explicit phase and Doppler tracking/correction. Thanks to the two techniques together with traditional beamforming, the DD-SS system is shown capable of effectively dealing with many challenging issues posed by LRAC with a towed HLA, without using complicated receiver processing. During the 2010 Long-Range Acoustic Communication Experiment (LRAC10) in deep waters, the DD-SS system was tested by using a moving source at a speed of 2-3 kn at 75-m depth and a 64-element HLA towed at 3.5 kn at a depth of 200 m. Excellent uncoded error performance (less than 4% bit error rate) is demonstrated at a data rate of 6.4 b/s for a bandwidth of 200 Hz and at a range of 550 km.
In this paper, we analyze a compact vector sensor receiver using angle of arrival (AoA) framework which was recently proposed by Fauziya et. al. We demonstrate that this receiver performs better than a scalar receiver at no extra computational cost. The receiver exploits the inherent capability of a vector sensor to provide spatial diversity without the use of a sensor array. The paper also discuss a compressive sensing based channel estimator that performs better than a least squares estimator. Channel estimation is performed using a training sequence and the simulation clearly bring out the superior performance of the compressive sensing based channel estimator and that of the vector sensor based compact receiver.
A Soft Direct-Adaptive Turbo Equalization (Soft DA-TEQ) is proposed for robust MIMO UWA communications. The proposed Soft DA-TEQ is derived under on the general frame of Expectation Maximization (E.M.) algorithm, which utilize the a priori soft decisions from the decoder to direct the equalizer's coefficients adaptation. The a priori soft decisions directed adaptation effectively lower the error propagation, which often cause catastrophic performance degradation in Hard DA-TEQ. Besides, in each iteration of the E.M. based soft adaption, the reliability of the symbol estimation is updated and used in the next iteration of soft adaption, which further enhances the convergence of the DA-TEQ. Experimental results show that the proposed Soft DA-TEQ is capable of robust detection in fast time varying MIMO UWA channels, even with low pilot overhead.
Wide band chirp spread spectrum (CSS) has been studied in underwater acoustic (UWA) communications to guarantee low bit error rates with low transmission rates. On the other hand, high speed transmission schemes for UWA, especially Orthogonal-Frequency-Division-Multiplexing (OFDM) technology, can reach Mbit/s data rates but at the expense of reliability. In this paper, we propose a new transmission scheme based on multiplexing information bits to (quasi-)orthogonal chirp signals, called Quasi-Orthogonal Chirp Multiplexing (QOCM). It can be easily implemented on reprogrammable hardware as an extension to OFDM architectures. We evaluated the performance of the proposed scheme with simulation and tank experiments. Results show that QOCM scheme is able to achieve one order of magnitude better performance than an OFDM scheme under severe Doppler effect posed by simulation in long distance water transmission. Moreover, we observe in water tank experiment that the QOCM scheme is resilient against to the Doppler effects induced by relative speeds up to 5 knots, which corresponds to a Doppler shift of 214.16 Hz at a center frequency of 125 kHz.
This standard provides the techniques for objective measurement of electroacoustic characteristics of analog and digital telephones, handsets and headsets. Application is in the frequency range from 100 Hz to 8500 Hz. Although not specifically within the scope of this standard, the methods described are generally applicable to a wide variety of other communications equipment, including cordless, wireless and mobile communications ...