碩士 / 國立海洋大學 / 航運技術研究所 / 85 / AbstractFuzzy RAKE receiver schemes are presented in the
environments of underwater acoustic multipath communications.
There are severe multipath interference effects due to
reflection and refraction. We take advantage of the RAKE schemes
to separate different elements from multipath interference
signals, then use fuzzy systems to combine different branch
signals to make decisions for the adaptive and robust
communication techniques. The RAKE schemes can aggregate
different path signals to increase the decision reliability of
the communication systems. Spread spectrum signals are used for
combating or suppressing the detrimental effects of interference
due to jamming, interference arising from other user of the
channel, and self-interference due to multipath propagation. The
fuzzy systems are robust and they can be employed to the
nonlinear, time-variant and model-unknown system environments.
The adaptive networks have learning ability, they can
automatically tune the system parameters by means of adaptive
algorithms with training data. In this thesis, we combine these
advantages described previously to make up an adaptive and
robust communication system in the presence of the multipath
fading channel environments. It is shown that the fuzzy RAKE
receivers are able to deal with the multipath interference
signals with performances closely track the optimum BER (Bit
Error Rate) obtained when the channel coefficients are known
exactly.
| Identifer | oai:union.ndltd.org:TW/085NTOU0300003 |
| Date | January 1997 |
| Creators | Wu, Yung-Tsung, 吳永聰 |
| 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 | 75 |
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