Results 241 to 250 of about 62,673 (306)

Temporal Correlation and Message-Passing-Based Sparse Bayesian Learning Channel Estimation for Underwater Acoustic Communications

IEEE Journal of Oceanic Engineering
To mitigate the error propagation of single-carrier time-domain equalization (SC-TDE) with insufficient observation data, this article proposes a low-complexity message-passing-based SC-TDE algorithm.
Jingwei Yin, Guangjun Zhu, Xiao Han, Long-xiang Guo, Lin Li, Wei Ge   +5 more
semanticscholar   +1 more source

A Learned Denoising-Based Sparse Adaptive Channel Estimation for OTFS Underwater Acoustic Communications

IEEE Wireless Communications Letters
This letter proposes a learned denoising-based sparse adaptive channel estimation method in the delay-Doppler domain for time-varying underwater acoustic (UWA) channels in an orthogonal time-frequency space (OTFS) system.
Lianyou Jing, Qingsong Wang, Chengbing He, Xuewei Zhang   +3 more
semanticscholar   +1 more source

Single-carrier with index modulation for underwater acoustic communications

, 2021
Index modulation (IM) has emerged as a promising technology for future wireless communications due to its potential to enhance both spectral efficiency and energy efficiency of wireless communication systems in recent years.
Wentao Shi, Chengbing He, Qianqian Dang, Lianyou Jing   +3 more
semanticscholar   +1 more source

Asynchronous multiuser underwater acoustic communications (L)

The Journal of the Acoustical Society of America, 2012
An asynchronous multiuser system is proposed to support multiple-access underwater communications without the use of code-division multiple-access or a feedback channel. The rich multipath channels experienced by spatially separated users will be sufficient to ensure separation of collided packets at the base station. The iterative receiver will employ
S E, Cho, H C, Song, W S, Hodgkiss
openaire   +2 more sources

Joint Bayesian Channel Estimation and Data Detection for Underwater Acoustic Communications

IEEE Transactions on Communications
This paper proposes a joint multi-task Bayesian channel estimation and data detection algorithm for Turbo equalization (TEQ) in underwater acoustic (UWA) communication.
Yaokun Liang, Hua Yu, Lijun Xu, Hao Zhao, Fei Ji, Shefeng Yan   +5 more
semanticscholar   +1 more source

IRS-Aided Secure Reliable Underwater Acoustic Communications

IEEE Transactions on Vehicular Technology
Recently, there has been a growing deployment of buoyed nodes on the sea surface for tactical acoustic communications with autonomous underwater vehicles (AUVs).
Abdallah S. Ghazy, Georges Kaddoum, Singh Satinder   +2 more
semanticscholar   +1 more source

Underwater Acoustic Communications Using Time Reversal

IEEE Journal of Oceanic Engineering, 2002
Time reversal, or phase-conjugation, refocuses energy back to a probe source location despite the complexity of the propagation channel. A probe source pulse is transmitted and a complicated multipath signal is measured by an array of source/receiver elements. The signal is time reversed and retransmitted into the ocean.
G.F. Edelmann, W.S. Hodgkiss, S. Kim, W.A. Kuperman, H.C. Song, T. Akal   +5 more
openaire   +1 more source

Bidirectional equalization for underwater acoustic communication

The Journal of the Acoustical Society of America, 2012
The bidirectional decision feedback equalizer (BiDFE) that combines the outputs of a conventional decision feedback equalizer (DFE) and backward DFE can improve the performance of the conventional DFE by up to 1–2 dB based on simulations. In this letter, the BiDFE concept is extended to multichannel time reversal communications involving a DFE as a ...
openaire   +2 more sources

Beyond underwater acoustic communications

OCEANS 2011 IEEE - Spain, 2011
The ability to communicate underwater using acoustic energy in place of electromagnetic energy is rapidly becoming commonplace. Indeed, vendors and academic researchers in many advanced countries are pursuing the development of acoustic modems. The emphasis often varies among these efforts: some, especially academic researchers, focus on increased ...
openaire   +1 more source

Sparse Direct Adaptive Equalization for Single-Carrier MIMO Underwater Acoustic Communications

IEEE Journal of Oceanic Engineering, 2020
The sparse direct adaptive equalization technique recently received many attentions for single-carrier underwater acoustic communications. By taking advantage of the sparse (nonuniform) structure of a direct adaptive equalizer (DAE), one obtains a sparse
Jun Tao, Yanbo Wu, Xiao Han, Konstantinos Pelekanakis   +3 more
semanticscholar   +1 more source