Experimental assessment of OFDM and DSSS modulations for use in littoral waters underwater acoustic communications

Frassati, F.; Lafon, C.; Laurent, Paul; Passerieux, Jean-Michel

doi:10.1109/oceanse.2005.1513163

Cited by 33 publications

(23 citation statements)

References 2 publications

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“…The existing work focuses mostly on conceptual system design, following the principles of narrowband radio systems, and the experimental results are scarce, e.g., [5]. The exception is the study [6] where a method is proposed for non-uniform Doppler compensation across the carriers.…”

Section: Introductionmentioning

confidence: 99%

Low Complexity OFDM Detector for Underwater Acoustic Channels

Stojanovic¹

2006

Oceans 2006

276

196

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Abstract-An adaptive algorithm is proposed for OFDM signal detection on Doppler-distorted, time-varying multipath channels. The focus of the approach is on low complexity post-FFT signal processing. The receiver performs MMSE combining of signals received across an array, using adaptive channel estimation. Nonuniform Doppler compensation across subbands is performed using a single adaptively estimated parameter representing the Doppler rate. Algorithm performance is demonstrated on experimental data, transmitted through a shallow water channel over the distance of 2.5 km. QPSK modulation with a varying number of carriers is used in a 24 kHz acoustic bandwidth. Excellent performance is achieved with up to 1024 carriers, yielding an overall bit rate of 30 kbps.

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Section: Introductionmentioning

confidence: 99%

Low Complexity OFDM Detector for Underwater Acoustic Channels

Stojanovic¹

2006

Oceans 2006

276

196

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“…The cyclic prefix of duration T G additionally protects the OFDM signal against inter-symbol interference [11]. Numerous sea and oceanic experimental trials of OFDM underwater communication systems have been reported [20][21][22][23][24][25][26][27]. The data transmission rate of a few kbps is achieved in shallow water channels with a depth of several hundred meters.…”

Section: Case Study -Ofdm Systemmentioning

confidence: 99%

“…[23]. In case of a channel with a depth of less than 100 m (and thus with much stronger multipath propagation phenomenon), only few hundred kbps are obtained [20][21]. However, there is a lack of reported results for very shallow water channels with a depth of ca.…”

Section: Case Study -Ofdm Systemmentioning

confidence: 99%

Underwater Acoustic Communications in Time-Varying Dispersive Channels

Kochańska

Schmidt

Rudnicki

2016

Annals of Computer Science and Information Systems

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Abstract-Underwater acoustic communication (UAC)system designers tend to transmit as much information as possible, per unit of time, at as low as possible error rate. However, the bit rate achieved in UAC systems is much lower than for wire or radio-communication systems. This is due to disadvantageous properties of the UAC channels, namely the sea and inland waters. Estimation of UAC channel transmission properties is possible within a limited bandwidth and temporal resolution. Thus, the UAC physical layer of data transmission is designed on the basis of roughly estimated channel parameters, or assuming the worst possible conditions. The paper presents the methodology of adapting UAC signaling schemes to tough underwater propagation conditions, through an example of two communication systems designed and developed at the Gdansk University of Technology.

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“…OFDM modulation and de-modulation can easily be implemented using fast Fourier transforms (FFT). In shallow waters in the Mediterranean sea, an experiment was conducted to compare the performance of OFDM with direct sequence spread spectrum (DSSS), both using differential PSK modulation (Frassati et al, 2005). The authors reported good OFDM performance (BER < 2 10 -3 ) at ranges up to 6 km.…”

Section: Multi-carrier Modulationmentioning

confidence: 99%

Underwater Acoustic Communications and Networking: Recent Advances and Future Challenges

Chitre¹,

Shahabudeen²,

Stojanovic³

2008

mar technol soc j

523

222

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A B S T R A C TThe past 30 years have seen a growing interest in underwater acoustic communications because of its applications in marine research, oceanography, marine commercial operations, the offshore oil industry and defense. Continued research over the years has resulted in improved performance and robustness as compared to the initial communication systems. In this paper, we aim to provide an overview of the key developments in point-to-point communication techniques as well as underwater networking protocols since the beginning of this decade. We also provide an insight into some of the open problems and challenges facing researchers in this field in the near future.protocols for such networks. In this paper, we do not attempt to provide an exhaustive survey of all research in the field, but instead concentrate on ideas and developments that are likely to be the keystone of future underwater communication networks. II. Underwater CommunicationsHigh-speed communication in the underwater acoustic channel has been challenging because of limited bandwidth, extended multipath, refractive properties of the medium, severe fading, rapid time variation and large Doppler shifts. In the initial years, rapid progress was made in deep water communication, but the shallow water channel was considered difficult. In the past decade, significant advances have been made in shallow water communication.

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Experimental assessment of OFDM and DSSS modulations for use in littoral waters underwater acoustic communications

Cited by 33 publications

References 2 publications

Low Complexity OFDM Detector for Underwater Acoustic Channels

Low Complexity OFDM Detector for Underwater Acoustic Channels

Underwater Acoustic Communications in Time-Varying Dispersive Channels

Underwater Acoustic Communications and Networking: Recent Advances and Future Challenges

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