@article{M36984099,
title = "A Study on MMSE Adaptive Beamforming of an Underwater OFDM System Using a Circular Array Hydrophones in the South Sea of Korea",
journal = "The Journal of Korean Institute of Communications and Information Sciences",
year = "2022",
issn = "1226-4717",
doi = "10.7840/kics.2022.47.7.986",
author = "Jun-Ho Kim,Min-Hyuk Cha,Fei Wang,Tae-Ho Im,Hak-Lim Ko",
keywords = "수중 음향 통신,적응 빔포밍,배열,Underwater Acoustic Communication,OFDM,Adaptive Beamforming,Array,MMSE",
abstract = "In This paper, Adaptive beamforming was used to improve the performance of the OFDM system in UWA channel. the center frequency and bandwidth of the OFDm system were 32kHz, 4kHz. and the length of one symbol was 125ms. beamforming weights were calculated through MMSE operation using pilot symbols inserted between subarriers and beamforming was applied. the interval of hydrophones arranged according to the wavelength of the frequency band. In order to the performance improvement according to the number of hydrophones, a ocean experiment was conducted in the waters near Jisepo Port, Geoje, Gyeongsangnam-do. SNR and CIR channel characteristics were analyzed using the measured data, and EVM and coded BER performance in the corresponding channel were analyzed. As a result, it was confirmed that the performance of the OFDM receiver to which MMSE beamforming is applied increases as the number of hydrophones increases. However, the performance increase expected of a single hydrophone decreased in the form of a quadratic function."
}