碩士 / 國立海洋大學 / 航運技術研究所 / 86 / Abstract-Ocean is a time-varing system with nonlinear acoustic
sound speed, which depends on depth, temperature and salinity.
The non-constant velocity causes the refraction of energy
propagation and thus acoustic rays bend during the propagation,
in which the multipath occurs. When the relative radial velocity
of platform is significant compared to the sound speed, the
Doppler spread and time compression in the transmitted waveform
will degrade the performance of the receiver.Utilize the fuzzy
adaptive filter, we propose a novel fuzzy RAKE receiver for
underwater communications. The fuzzy RAKE receiver consists of
fuzzy RLS and fuzzy LMS adaptive filters. Which are fused with
LMMSE（linear minimum mean-square error）criterion. Take the
advantages of RLS and LMS algorithm, the resulting system has
the properties of fast convergence, robustness and adaptation to
the environment. Furthermore, the system outperforms the
traditional RAKE receiver in terms of bit error rate and is
approximate to the optimum receiver.Finally, we implement the
adaptive fuzzy RAKE receiver with TMS320-C30 of digital signal
processor.
| Identifer | oai:union.ndltd.org:TW/086NTOU1300008 |
| Date | January 1998 |
| Creators | Hwang, Ding-Yuh, 黃頂育 |
| Contributors | Chao Jung-Jae, 趙俊傑 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 71 |
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