| Summary: | 碩士 === 聖約翰科技大學 === 電子工程系碩士班 === 100 === Underwater acoustic communication is a core of oceanography . This channel has exhibited two kinds of important characteristic such as extensively time-varying multipath and high level non-Gaussian ambient noise. At presented underwater acoustic channel communication transmission, acoustic wave is the best choice by its characteristic which is hard to absorb in water. In this paper, we use the underwater acoustic channel model[1] and then orthogonal frequency division multiplex (OFDM) motes the data rate, as well as resists inter-Symbol Interference (ISI) which occurred in multipath transmission. We use Low-Density Parity-Check Code (LDPC code) to solve Doppler spread which occurred by time-varying channel, and the effect caused the higher data rate and lower error probability.
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