Low-Complexity Doppler Compensation Algorithm for Underwater Acoustic OFDM Systems With Nonuniform Doppler Shifts

Ma, Lu; Jia, Hanbo; Liu, Songzuo; Khan, Imran Ullah

doi:10.1109/lcomm.2020.2998293

Cited by 33 publications

(13 citation statements)

References 15 publications

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“…The inversion of a diagonal matrix has a significantly lower complexity of O(N ), resulting the MMSE detector having the complexity level of a maximal ratio combiner (MRC) [21]. Furthermore, it can be noted from (18), (19) and (20), that channel state information (CSI) is required to compute W W W (f ). Determining this accurately is difficult in IoUTs for several reasons.…”

Section: B Mmse Detectormentioning

confidence: 99%

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Single Carrier Frequency Domain Detectors for Internet of Underwater Things

Aljanabi¹,

Alluhaibi²,

Ahmed³

et al. 2022

Preprint

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This paper proposes low complexity detection for internet of underwater things (IoUT)s communication. The signal is transmitted from the source to the destination using several sensors. To simplify the computational operations at the transmitter and the sensory nodes, a single carrier frequency domain equalizer (SC-FDE) is proposed and amplify-and-forward (AF) protocols are employed. Fast Fourier transform (FFT) and use of cyclic prefix (CP) are also proposed to simplify these algorithms when compared to time-domain equalization. As precise channel data is difficult to capture in underwater communications, the adaptive implementation of FDE is proposed as a solution that can be employed when the channel experiences a fast doppler shift. The two adaptive detectors are based on the least mean-square (LMS) and recursive least square (RLS) principles. Numerical simulations show that the performance of the bit error rate (BER) performance of the proposed detectors is close to that of the ideal minimum mean square error (MMSE).

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Section: B Mmse Detectormentioning

confidence: 99%

“…solution to address underwater propagation channel challenges is to increase the transmit power and/or a high complexity transceiver design [18], [19]. However, this is not a feasible option due to limited available power at underwater communicating nodes [20].…”

mentioning

confidence: 99%

Single Carrier Frequency Domain Detectors for Internet of Underwater Things

Aljanabi¹,

Alluhaibi²,

Ahmed³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In order to obtain higher estimation accuracy at a lower sampling rate, some researchers interpolate the results after performing autocorrelation, and propose several methods 21,22 for fine Doppler scale estimation by interpolating autocorrelation peaks, which are based on the expected autocorrelation output expression. Then others have proposed to use compensation FFT and interpolation to achieve higher accuracy 23 …”

Section: Related Workmentioning

confidence: 99%

Doppler estimation based on linear interpolation for underwater acoustic communication

Wang

et al. 2022

Trans Emerging Tel Tech

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In this article, we develop a Doppler estimation approach based on linear interpolation for underwater acoustic (UWA) OFDM system. Linear interpolation is used to achieve the resampling of the received signal. By interpolating the sampled signal with different compensation factors at the receiving end, the repeating structure of the CP-OFDM symbol is used to maximize the correlation value at the fixed window to obtain the estimated value of the Doppler factor. The fixed window is determined based on the length of the cyclic prefix and the maximum path delay. In addition, we deduced the expression of the received discrete sequence to perform correlation operations after interpolation, which is the theoretical basis of our proposed algorithm. Moreover, in order to reduce the number of iterations, which means computational complexity in this algorithm, we recommend using the dichotomy to quickly find the maximum correlation value. Simulation proves that the proposed algorithm perform better than other CP-OFDM-based time-domain autocorrelation algorithms.

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“…The OFDM technique divides the available frequency band into orthogonal subcarriers. Symbols are emitted concurrently by these mutually orthogonal subcarriers with overlapping frequency bands [53,54].…”

Section: Ofdm Based Uwac Systemsmentioning

confidence: 99%

Full Duplex Physical and MAC Layer-Based Underwater Wireless Communication Systems and Protocols: Opportunities, Challenges, and Future Directions

Liu

Iqbal

Khan

et al. 2021

JMSE

Self Cite

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Underwater wireless communication has gained a great deal of attention in the last couple of decades because of its applications in the military, industrial, and monitoring sectors. Despite the extreme physical and MAC layer difficulties, acoustics are used for various applications among the various modes of underwater communication technologies used. While significant research efforts have been made to address these issues, the bottleneck remains in achieving high bandwidth, high throughputs, and data rate. Researchers have begun to look into full duplex (FD) implementation to improve bandwidth efficiency and increase data rate and throughput. Users can send and receive data simultaneously over the FD links, maximizing bandwidth utilization and increasing throughput. As a result, we thoroughly reviewed various FD physical layered UWAC systems and MAC layered protocols for underwater communication. The various problems that the aforementioned systems and protocols have faced, as well as the solutions suggested in previous works to solve each problem, are also highlighted. Various metrics are used to compare the performance of various physical layered FD systems and FD MAC protocols. We also explore some of the open research questions in these FD-physical layered and MAC layered protocols, as well as future research directions. Based on ample information, we suggest a cross-layered architecture based on various IBFD-SI cancellations, DA-CSMA, and FD-MAC protocols. This review provides a broad view of the current FD physical and MAC layered protocols based on acoustic communication, as well as recommendations.

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Low-Complexity Doppler Compensation Algorithm for Underwater Acoustic OFDM Systems With Nonuniform Doppler Shifts

Cited by 33 publications

References 15 publications

Single Carrier Frequency Domain Detectors for Internet of Underwater Things

Single Carrier Frequency Domain Detectors for Internet of Underwater Things

Doppler estimation based on linear interpolation for underwater acoustic communication

Full Duplex Physical and MAC Layer-Based Underwater Wireless Communication Systems and Protocols: Opportunities, Challenges, and Future Directions

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