| Summary: | 碩士 === 國立臺灣海洋大學 === 電機工程學系 === 106 === In the thesis, a 2 x 2 direct mapping (DM) based filter bank multicarrier (FBMC)- low-density parity check (LDPC) advanced underwater image transmission scheme is proposed. The transmission bit error rates (BERs), peak signal to noise ratios (PSNRs), and power saving (PS) ratios for the proposed underwater advanced image transmission scheme with channel estimation errors of 0%( perfect channel estimation), 5%, 10%, and 20%, are investigated. The BERs for underwater image transmission are required to be less than 10-4. The simulation results show that the BERs of the 2 x 2 DM binary phase shift keying (BPSK) modulation are lower than those of the 2 x 2 DM 4 offset quadrature amplitude modulation (4-OQAM) scheme. When transmission power and additive white Gaussian noise (AWGN) are the same, owing to the channel estimation errors being large, the PSNRs of the received image signals are low. The PS ratios of 2 x 2 DM BPSK modulation are higher than those of 2 x 2 DM 4-OQAM under the same channel estimation errors, AWGN, and maximum BER of 10-4. From these simulations, the performance of the proposed advanced DM underwater image transmission scheme is evaluated.
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