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Joint low‐complexity equalization and CFO estimation and compensation for UWA‐OFDM communication systems
Author(s) -
Ramadan Khaled,
Ramadan Khalil F.,
Fiky Ahmed S.,
Alam Hasna,
Dessouky Moawad I.,
Abd ElSamie Fathi E.
Publication year - 2020
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.3972
Subject(s) - carrier frequency offset , orthogonal frequency division multiplexing , computer science , equalization (audio) , synchronization (alternating current) , compensation (psychology) , joint (building) , frequency offset , real time computing , preamble , algorithm , telecommunications , decoding methods , engineering , channel (broadcasting) , architectural engineering , psychology , psychoanalysis
Summary Frequency synchronization has a great importance in preserving the performance of the underwater acoustic (UWA) orthogonal frequency division multiplexing (OFDM) systems. The carrier frequency offset (CFO) estimation can be blind or data‐aided. In this paper, the Zadoff‐Chu (ZC) sequences are used for OFDM synchronization in UWA communications, and they are compared with different data‐aided algorithms. We propose a low‐complexity algorithm for CFO estimation based on ZC sequences. Also, a joint equalization and CFO compensation scheme for UWA‐OFDM communication systems is presented. Simulation results demonstrate that the proposed CFO estimation algorithm allows estimation of the CFO accurately with a simple implementation in comparison with the traditional schemes. Also, the performance of the UWA‐OFDM system can be preserved in the presence of frequency offsets.