Research of FH-MFSK Underwater Acoustic Communication Based on Non-Binary LDPC Codes

Abstract:

Compared with binary-modulation, Multiple-modulation can obtain higher rate of transmission in the condition of same symbol-rate. If using binary channel codes with multiple-modulation, there exists an problem of information-loss of the probability from bit to symbol conversion. Underwater acoustic channel is an multipath, time-variation, high-noise and strong doppler-effect wireless channel, which leads to high error-rate caused by signal distortion. To solve the problems above, we adopt FH-MFSK modulation to overcome the inter-symbol interference by multipath. The PN sequence is used as a frame synchronization signal and frequency energy accumulation method is used to detect the frame-synchronization. PN hopping signal is chosen to estimate the doppler frequency-shift and using non-binary LDPC codes based on symbol for channel error codes. Finally, We perform numerical simulations and the experiments on the lake to show that compared with binary LDPC codes, non-binary LDPC codes for multiple-modulation can achieve same error-rate under lower SNR.

• Periodical: Applied Mechanics and Materials (Volumes 519-520)
• Pages: 945-952
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.519-520.945
• Online since: February 2014
• Authors: Wei Wei Fan*, Bo Li, You Wen Zhang, Da Jun Sun
• Keywords: FH-MFSK, Non-Binary LDPC Code, Underwater Acoustic Communication

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