Nonstationary System Analysis Methods for Underwater Acoustic Communications

Josso, Nicolas; Zhang, Jun Jason; Papandreou-Suppappola, Antonia; Ioana, Cornel; Duman, Tolga M.

doi:10.1155/2011/807472

Cited by 7 publications

(8 citation statements)

References 41 publications

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“…Then the eigen-vectors are realised as a set of FIR eigen-vector (6) ... (6) which corresponds to the i th largest eigenvalue of xx . Hence, q i appear in the i th column of V. This will produce the transfer function given by (7)…”

Section: Proposed Algorithm For Spectral Estimation and Filter Implemmentioning

confidence: 99%

An information rich subspace separation for non-stationary signal classification

Ratnayake¹,

Nettasinghe²,

Godaliyadda³

et al. 2016

J. Natn. Sci. Foundation Sri Lanka

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This paper proposes a novel automated approach for non-principal component analysis (non-PCA) methodology. This method generates an eigen analysis based pseudospectrum to emulate the spectral characteristic variations of pseudo-spectrum is used to implement a comb like subspace spectral components throughout the whole observation period. results than the existing dimensionality reduction methods, which only utilise the principal k components of the eigen space. Finally, a novel probabilistic approach which creates a signature vector representing each class of signals in the training that the proposed method can be effectively used not only for signature features from a non-stationary signal. Further, it is be used as a dynamic spectral estimation technique, which can eliminate the time frequency resolution tradeoff that exists in techniques such as short-time fourier transform (STFT).

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Section: Proposed Algorithm For Spectral Estimation and Filter Implemmentioning

confidence: 99%

An information rich subspace separation for non-stationary signal classification

Ratnayake¹,

Nettasinghe²,

Godaliyadda³

et al. 2016

J. Natn. Sci. Foundation Sri Lanka

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show abstract

“…As the UWA communications channel is highly time-varying, it can cause undesirable distortions, such as multipath and Doppler scaling, under certain conditions [5][6][7]. Existing UWA communications schemes do not fully exploit matching the UWA channel characteristics to signaling schemes and often have to compensate for that at the receiver.…”

Section: Motivation and Relation To Prior Workmentioning

confidence: 99%

“…The received signal of a wideband LTV channel, without the additive noise component, is given by [7,10] …”

Section: Discrete Time-scale Wideband Modelmentioning

confidence: 99%

“…Efficient wideband system processing can be achieved using a discrete time-scale system model [10]. Using this model for a wideband UWA communications channel, we can represent the system output as [7,10] …”

Section: Discrete Time-scale Wideband Modelmentioning

confidence: 99%

“…Note that we assume that the UWA channel WSF coefficients are estimated a priori; methods for estimating the WSF coefficients can be found in [6,7].…”

Section: Multi-user Uwa Hfm Signalingmentioning

confidence: 99%

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Hyperbolic frequency modulation for multiple users in underwater acoustic communications

Zhou

Zhang

Papandreou-Suppappola

2014

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Nonlinear frequency-modulated signals have been effectively applied in multiple-user communication schemes. In this paper, we propose to implement a multiple-user communication scheme using hyperbolic frequency-modulated (HFM) signals for underwater acoustic communications. We derive constraints on the HFM parameters to optimally reduce multiple access interference (MAI) at the transmission side. Additional constraints on the frequency-modulation (FM) rate reduce the underwater channel effects of multipath and scaling. The proposed signaling scheme is compared to an HFM-based code-division multiple-access (HFM-CDMA) scheme to demonstrate improved error performance. MOTIVATION AND RELATION TO PRIOR WORKUnderwater acoustic (UWA) communications methods, such as orthogonal frequency-division multiplexing (OFDM) and code-division multiple access (CDMA), have been widelyused for multiple users [1][2][3][4]. As the UWA communications channel is highly time-varying, it can cause undesirable distortions, such as multipath and Doppler scaling, under certain conditions [5][6][7]. Existing UWA communications schemes do not fully exploit matching the UWA channel characteristics to signaling schemes and often have to compensate for that at the receiver. In [1], the distorted OFDM signal due to Doppler is compensated at the receiver using resampling, and any remaining Doppler is removed using inter-carrier interference reduction techniques. A multiple resampling OFDM receiver front-end is designed in [2] such that each resampling branch deals with a different Doppler factor. Adaptive multi-user detection techniques are applied in [3], but their assumed UWA channel model does not include multiple Doppler paths at the receiver. A spread spectrum hyperbolic frequency modulation scheme in [8] can potentially match the UWA channel but only assumes one Doppler scale path and does not compensate for multiple time delay paths that can distort any potential scale diversity. In [9], we design an HFM scheme to match the This work is funded by the National Science Foundation grant NSF-ECCS 1102357.UWA communications channel. The HFM scheme is integrated with the use of a discrete time-scale canonical model, which represents the received signal from a wideband channel as a linear superposition of discrete time shifts and Doppler scalings of the transmitted signal, weighted by the wideband spreading function (WSF) [10]. We demonstrate an inherent joint multipath-scale diversity using this scheme, and we combine it with direct sequence CDMA for use in multi-user UWA communications. The different users are distinguished by a unique pseudo-noise (PN) sequence [9]. As we demonstrate, the scheme can successfully resolve information bits at the receiver side, but the performance degrades as the number of users increases.A nonlinear frequency-modulated signaling scheme is developed in [11] by deriving constraints on the nonlinear phase function of the transmit signal to achieve orthogonality; the scheme, combined with frequency-hopping CDMA, is use...

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An underwater acoustic communication scheme exploiting biological sounds

ElMoslimany

Zhou

Duman

et al. 2016

Wireless Communications

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Underwater acoustic (UWA) communications have attracted a lot of interest in recent years motivated by a wide range of applications including offshore oil field exploration and monitoring, oceanographic data collection, environmental monitoring, disaster prevention, and port security. Different signaling solutions have been developed to date including non-coherent communications, phase coherent systems, multi-input and multi-output solutions, time-reversal-based communication systems, and multi-carrier transmission approaches. This paper deviates from the traditional approaches to UWA communications and develops a scheme that exploits biomimetic signals. In the proposed scheme, a transmitter maps the information bits to the parameters of a biomimetic signal, which is transmitted over the channel. The receiver estimates the parameters of the received signal and demaps them back to bits to estimate the message. As exemplary biomimetic signals, analytical signal models with nonlinear instantaneous frequency are developed that match mammal sound signatures in the time-frequency plane are developed. Suitable receiver structures as well as performance analysis are provided for the proposed transmission scheme, and some results using data recorded during the Kauai Acomms MURI 2011 UWA communications experiment are presented.

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Nonstationary System Analysis Methods for Underwater Acoustic Communications

Cited by 7 publications

References 41 publications

An information rich subspace separation for non-stationary signal classification

An information rich subspace separation for non-stationary signal classification

Hyperbolic frequency modulation for multiple users in underwater acoustic communications

An underwater acoustic communication scheme exploiting biological sounds

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