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Performance Evaluation of the Complex-Coefficient Adaptive Equalizer Using the Hilbert Transform
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 Title & Authors
Performance Evaluation of the Complex-Coefficient Adaptive Equalizer Using the Hilbert Transform
Park, Kyu-Chil; Yoon, Jong Rak;
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In underwater acoustic communication, the transmitted signals are severely influenced by the reflections from both the sea surface and the sea bottom. As very large reflection signals from these boundaries cause an inter-symbol interference (ISI) effect, the communication quality worsens. A channel estimation-based equalizer is usually adopted to compensate for the reflected signals under the acoustic communication channel. In this study, a feed-forward equalizer (FFE) with the least mean squares (LMS) algorithm was applied to a quadrature phase-shift keying (QPSK) transmission system. Two different types of equalizers were adopted in the QPSK system, namely a real-coefficient equalizer and a complex-coefficient equalizer. The performance of the complex-coefficient equalizer was better than that of two real-coefficient equalizers. Therefore, a Hilbert transform was applied to the real-coefficient binary phase-shift keying (BPSK) system to obtain a complex-coefficient BPSK system. Consequently, we obtained better results than those of a real-coefficient equalizer.
Feed-forward equalizer;Inter-symbol interference;Least mean squares algorithm;Quadrature phase-shift keying;Underwater acoustic communication;
 Cited by
Hilbert-Transform-Based Accurate Determination of Ultrashort-Time Delays in Terahertz Time-Domain Spectroscopy, IEEE Transactions on Terahertz Science and Technology, 2017, 7, 5, 514  crossref(new windwow)
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