Underwater acoustic communication by passive-phase conjugation: theory and experimental results

Rouseff, Daniel; Jackson, D.R.; Fox, Warren L. J.; Jones, C.D.; Ritcey, J.A.; Dowling, David R.

doi:10.1109/48.972122

Cited by 237 publications

(151 citation statements)

References 14 publications

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“…One approach to compensating for these changes is to break a long data stream into small sections and intersperse additional probe pulses. While this approach has been applied successfully [7], the method is inefficient, as no data can be transmitted while the environment is being reprobed.…”

Section: Decision-directed Passive Phase Conjugationmentioning

confidence: 99%

“…As implemented in Rouseff et al [7], passive phase conjugation processing begins by transmitting a single probe pulse. The response to this probe pulse is recorded at each element in the distant receiving array.…”

Section: Decision-directed Passive Phase Conjugationmentioning

confidence: 99%

“…Acoustic communications represents a plausible application of time-reversal processing in the ocean. Both active [4][5][6] and passive [7][8][9] versions of the processing have been tested in experiments.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acoustic Communication Using Time-Reversal Signal Processing: Spatial and Frequency Diversity

Rouseff¹,

Flynn²,

Ritcey³

et al. 2004

AIP Conference Proceedings

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Abstract. Time-reversal signal processing can be viewed as a form of matched filtering that operates both in time and in space. Acoustic communication represents a promising potential application of the processing. In designing a communications system, constraints are imposed by the available bandwidth and by the geometry of the time-reversal array. In the present paper, the interplay between bandwidth and array geometry is examined. If the bandwidth is large relative to the symbol rate, time -reversal processing can be successful with sparse arrays. If the array is well populated, the required bandwidth can be reduced. Results from experiments and data-driven simulations are presented.

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Section: Decision-directed Passive Phase Conjugationmentioning

confidence: 99%

Section: Decision-directed Passive Phase Conjugationmentioning

confidence: 99%

See 1 more Smart Citation

Acoustic Communication Using Time-Reversal Signal Processing: Spatial and Frequency Diversity

Rouseff¹,

Flynn²,

Ritcey³

et al. 2004

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…However, there is a significant shortcoming that means multichannel equalization requires the high computational complexity [5,12,13]. In the early 2000s, the time reversal technique was introduced as an alternative to the equalization process [14][15][16]. Although the time reversal technique also employs an array of spatially separated receivers, it is relatively simple, effectively reduces the ISI in a multipath environment, and restores the original communication signal, thereby increasing the signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

“…In general, the q-function depends on the complexity of the communication channel, the number of receivers in the array, and their spacing [19]. In an ideal case in which the estimated CIR has infinite bandwidth and no multipath, the q-function becomes a delta function, and the time reversal process recovers the exact original communication signal [14][15][16][17][18][19]. However, in a real ocean waveguide, the q-function is no longer the delta function, but has a main lobe and side lobes, producing a residual ISI of time compressed signal.…”

Section: Introductionmentioning

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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References

2014

OFDM for Underwater Acoustic Communications

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Underwater acoustic communication by passive-phase conjugation: theory and experimental results

Cited by 237 publications

References 14 publications

Acoustic Communication Using Time-Reversal Signal Processing: Spatial and Frequency Diversity

Acoustic Communication Using Time-Reversal Signal Processing: Spatial and Frequency Diversity

Estimate of Passive Time Reversal Communication Performance in Shallow Water

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