Research of Underwater Communications Platform Based on Orthogonal Frequency Division Multiplexing

• Main Authors: Chin-Hua Chang, 張津華
• Other Authors: Hsien-Sen Hung
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/24363926560068473643

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 101 === This thesis is aimed to design an underwater acoustic modem, based on the multicarrier modulated orthogonal frequency division multiplexing (OFDM). In the design of OFDM transmitter, two data modes of long burst and short burst are considered and used for data transmission. To reduce bit error rate, we propose an least-squares scheme in the short burst mode as well as the three schemes of linear interpolation equalization, adaptive least square equalization and adaptive minimum mean-square error equalization for channel estimation and symbol detection. For system simulation of the OFDM communication platform, we use the LabVIEW software to design the underwater acoustic modem and adopt the measured channel impulse response from the MACHO project funded by the national central weather bureau. Simulation results demonstrate the feasibility of the proposed schemes.