Low-Complexity Progressive MIMO-OFDM Receiver for Underwater Acoustic Communication

Qiao, Gang; Babar, Zeeshan; Zhou, Feng; Ma, Lu; Li, Xue

doi:10.3390/sym11030362

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…The underwater channel degrades the signal adversely due to multipath arrivals, the Doppler shift, absorption, and attenuation losses [39]. To overcome these effects, the channel is estimated and the errors are minimized through channel equalization.…”

Section: Channel Estimation and Equalizationmentioning

confidence: 99%

Symmetry Oriented Covert Acoustic Communication by Mimicking Humpback Whale Song

et al. 2019

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To meet the increasing demand of covert underwater acoustic communication, biologically inspired mimicry communication watermarking the data in symmetrical humpback whale song is presented. Mimicry is an entirely different approach from traditional covert communication where data are transmitted by spreading the waveform at a low signal to noise ratio. In this innovative technique, the carrier signal is imitated symmetrical to the ocean background noise, which can be shipping noise, anthropological noise, or the vocals emitted by sea animals. The eavesdropper can detect the communication signal, but will assume it to be real ocean noise due to its symmetry. It excludes the mimicked signal from recognition, which makes the communication covert. In this research, we watermarked the covert information in humpback whale song using discrete cosine transform in the frequency domain. The mimicked symmetrical signal provided excellent imperceptibility with the real song and an outstanding camouflage effect was calculated. We validated the novel concept by simulation and underwater tank experiment. 10−4 BER was achieved in the underwater tank experiment, which was diminished to zero error by using matching pursuit estimation and virtual time reversal equalization. This novel bionic covert communication technique is feasible for clandestine underwater acoustic communication in the presence of an eavesdropper with better imperceptibility.

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Section: Channel Estimation and Equalizationmentioning

confidence: 99%

Symmetry Oriented Covert Acoustic Communication by Mimicking Humpback Whale Song

et al. 2019

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“…Whereas in non-adaptive synchronization, null subcarriers are needed for achieving robustness to make the variations in channel rapidly [5]. By integrating it with estimation of a channel in the time domain or impulse response, the approach [6] is extended in this study. Performing the channel sparsing is the possibility for this motivation.…”

Section: Introductionmentioning

confidence: 99%

Design and Development of Novel Channel estimation method for OFDM based Underwater communication

Asha

Surekha

2021

Preprint

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The ocean is a constantly changing environment whose properties are still great Challenges to Developing Effective Underwater Wireless Communication represent. The high absorption of electromagnetic and optical signals in the water limits this Use and development of underwater electromagnetic communication systems. A possible approach to wireless underwater communication over longer distances (> 100m), offers acoustic signal transmission, modulation methods such as frequency shift keying are also used (FSK) and phase-shift keying (PSK) are used. In many areas the orthogonal frequency division multiplex method (Orthogonal Frequency Division Multiplexing, OFDM) is enforced for high data rates. It offers a multi-carrier transmission method Benefits in treating multipath propagation, nevertheless achieves a bandwidth efficiency similar to that of corresponding single-carrier processes. In recent studies, the OFDM methods are adopted for underwater communication. However the real time implementation is becoming a challenging part. The channel estimation plays vital role in underwater communication. In this research work, the novel sparse channel estimation in OFDM based underwater communication is proposed for long distances. The proposed algorithms are developed in fixed point manner which can be implemented in FPGA. The BER values are estimated for proposed algorithm and validated with the conventional algorithms. The proposed algorithms exhibits better results compared with the conventional algorithms.

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“…The BERs and data symbol error (DSE) rates of the proposed system are explored. Qiao et al [16] proposed a 2 × 2 MIMO OFDM-based high speed underwater acoustic transmission system, with low density parity check (LDPC) channel coding, orthogonal matching pursuit (OMP) channel estimation, and minimum mean-squared error (MMSE) equalization methods integrated into the underwater acoustic transceiver. The BERs of the transceiver were studied.…”

Section: Introductionmentioning

confidence: 99%

Direct-Mapping-Based MIMO-FBMC Underwater Acoustic Communication Architecture for Multimedia Signals

Lin

Chang

et al. 2019

Applied Sciences

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In this paper, a direct-mapping (DM)-based multi-input multi-output (MIMO) filter bank multi-carrier (FBMC) underwater acoustic multimedia communication architecture (UAMCA) is proposed. The proposed DM-based MIMO-FBMC UAMCA is rare and non-obvious in the underwater multimedia communication research topic. The following are integrated into the proposed UAMCA: A 2 × 2 DM transmission mechanism, a (2000, 1000) low-density parity-check code encoder, a power assignment mechanism, an object-composition petrinet mechanism, adaptive binary phase shift keying modulation and 4-offset quadrature amplitude modulation methods. The multimedia signals include voice, image, and data. The DM transmission mechanism in different spatial hardware devices transmits different multimedia packets. The proposed underwater multimedia transmission power allocation algorithm (UMTPAA) is simple, fast, and easy to implement, and the threshold transmission bit error rates (BERs) and real-time requirements for voice, image, and data signals can be achieved using the proposed UMTPAA. The BERs of the multimedia signals, data symbol error rates of the data signals, power saving ratios of the voice, image and data signals, mean square errors of the voice signals, and peak signal-to-noise ratios of the image signals, for the proposed UAMCA with a perfect channel estimation, and channel estimation errors of 5%, 10%, and 20%, respectively, were explored and demonstrated. Simulation results demonstrate that the proposed 2 × 2 DM-based MIMO-FBMC UAMCA is suitable for low power and high speed underwater multimedia sensor networks.

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Low-Complexity Progressive MIMO-OFDM Receiver for Underwater Acoustic Communication

Cited by 6 publications

References 23 publications

Symmetry Oriented Covert Acoustic Communication by Mimicking Humpback Whale Song

Symmetry Oriented Covert Acoustic Communication by Mimicking Humpback Whale Song

Design and Development of Novel Channel estimation method for OFDM based Underwater communication

Direct-Mapping-Based MIMO-FBMC Underwater Acoustic Communication Architecture for Multimedia Signals

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