Phase-coherent digital communications for underwater acoustic channels

Stojanovic, Milica; Catipovic, Josko; Proakis, J.G.

doi:10.1109/48.289455

Cited by 594 publications

(356 citation statements)

References 13 publications

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“…One major step towards high rate communication is the direct transmission of phase-coherent modulations, including PSK and quadrature amplitude modulation (QAM) [22]. The channel introduces a great deal of ISI due to multipath propagation.…”

Section: Single Carrier Phase-coherent Modulation With Adaptive Channmentioning

confidence: 99%

“…Although widely used for slowly-varying multipath channels in radio applications, channel equalization for fast-varying underwater channel is a big challenge. The canonical receiver in Reference [22] successfully combined a second-order phaselocked-loop to track channel phase variations with an adaptive decision feedback equalizer to suppress the ISI.…”

Section: Single Carrier Phase-coherent Modulation With Adaptive Channmentioning

confidence: 99%

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Prospects and problems of wireless communication for underwater sensor networks

Liu

Zhou

Cui

2008

Wireless Communications

355

101

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SummaryThis paper reviews the physical fundamentals and engineering implementations for efficient information exchange via wireless communication using physical waves as the carrier among nodes in an underwater sensor network (UWSN). The physical waves under discussion include sound, radio, and light. We first present the fundamental physics of different waves; then we discuss and compare the pros and cons for adopting different communication carriers (acoustic, radio, and optical) based on the fundamental first principles of physics and engineering practice. The discussions are mainly targeted at underwater sensor networks (UWSNs) with densely deployed nodes. Based on the comparison study, we make recommendations for the selection of communication carriers for UWSNs with engineering countermeasures that can possibly enhance the communication efficiency in specified underwater environments.

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Section: Single Carrier Phase-coherent Modulation With Adaptive Channmentioning

confidence: 99%

Section: Single Carrier Phase-coherent Modulation With Adaptive Channmentioning

confidence: 99%

Prospects and problems of wireless communication for underwater sensor networks

Liu

Zhou

Cui

2008

Wireless Communications

355

101

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“…This information is listed in the box at the lower right of Figure 6. The output SNR can be estimated by the reciprocal of the mean-squared error [19,26], which is given by…”

Section: Performance Analysis Of Passive Time Reversal Communicationmentioning

confidence: 99%

“…This information is listed in the box at the lower right of Figure 6. The output SNR can be estimated by the reciprocal of the mean-squared error [19,26], which is given by with the BER and the output SNR, respectively. The symbol color and shape indicate the number of channel summations, source-receiver range and the site.…”

Section: Performance Analysis Of Passive Time Reversal Communicationmentioning

confidence: 99%

Estimate of Passive Time Reversal Communication Performance in Shallow Water

et al. 2017

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Time reversal processes have been used to improve communication performance in the severe underwater communication environment characterized by significant multipath channels by reducing inter-symbol interference and increasing signal-to-noise ratio. In general, the performance of the time reversal is strongly related to the behavior of the q-function, which is estimated by a sum of the autocorrelation of the channel impulse response for each channel in the receiver array. The q-function depends on the complexity of the communication channel, the number of channel elements and their spacing. A q-function with a high side-lobe level and a main-lobe width wider than the symbol duration creates a residual ISI (inter-symbol interference), which makes communication difficult even after time reversal is applied. In this paper, we propose a new parameter, E q , to describe the performance of time reversal communication. E q is an estimate of how much of the q-function lies within one symbol duration. The values of E q were estimated using communication data acquired at two different sites: one in which the sound speed ratio of sediment to water was less than unity and one where the ratio was higher than unity. Finally, the parameter E q was compared to the bit error rate and the output signal-to-noise ratio obtained after the time reversal operation. The results show that these parameters are strongly correlated to the parameter E q .

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“…When the system bandwidth and thus the symbol rate change, the same physical channel of a certain delay spread leads to discrete-time channels with different number of taps. For single carrier transmission and adaptive equalization approaches [9], the equalizer length and adaptation constants need to be carefully tuned when the channel length changes. On the contrary, channel equalization complexity in OFDM does not depend on the channel length in the time domain, and hence intuitively OFDM can effectively handle symbol rate changes.…”

Section: Introductionmentioning

confidence: 99%

Scalable OFDM design for underwater acoustic communications

Zhou

Huang

et al. 2008

2008 IEEE International Conference on Acoustics, Speech and Signal Processing

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Multicarrier modulation in the form of OFDM has been actively pursued for underwater acoustic communication recently. In this paper, we present a desirable property of OFDM that one signal design can be easily scaled to t into different transmission bandwidths with negligible changes on the receiver. We have tested the proposed design with data collected from experiments at AUV Fest, Panama City, FL, June 2007, and at the Buzzards Bay, MA, Aug. 2007. With QPSK modulation, we have used different bandwidths from 3 kHz to 50 kHz, leading to data rates from 1.5 kbps to 25 kbps after rate 1/2 coding. With 16-QAM modulation, we have used different bandwidths from 12 kHz to 50 kHz, leading to data rates from 12 kbps to 50 kbps. Excellent BER performance has been achieved, which con rms the exibility of OFDM under different system setups.

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Phase-coherent digital communications for underwater acoustic channels

Cited by 594 publications

References 13 publications

Prospects and problems of wireless communication for underwater sensor networks

Prospects and problems of wireless communication for underwater sensor networks

Estimate of Passive Time Reversal Communication Performance in Shallow Water

Scalable OFDM design for underwater acoustic communications

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