吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (4): 1171-1176.doi: 10.13229/j.cnki.jdxbgxb201404041

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BCH-LDPC coded MIMO-OFDM underwater acoustic communication system

ZHAO Dan-feng, WANG Yang, LIAO Xi, ZHOU Xiang-chao   

  1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China
  • Received:2012-12-21 Online:2014-07-01 Published:2014-07-01

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Abstract: The underwater acoustic channel is the most complex channel. In order to achieve significant diversity gain in the underwater acoustic channel, a BCH-LDPC coded Multi In Multi Out-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) underwater acoustic system is developed and an improved receiver is proposed for the system. In the system, the outer and inner encoders are separated by the V-BLAST encoder in the transmitter. The improved receiver is based on the joint iterative detection and decoding algorithm. A portion of information is feedback from the outer decoder to reduce the operation times of the MIMO detection and improve the reliability of the initial soft information. The performance of the system using three different receivers is analyzed by simulation. Results show that the improved receiver can obtain more performance gain and the computational complexity is significantly lower. Besides, when the system coded rates are the same, the performance of the BCH-LDPC coded system it better than that of the separate coding system at high Signal-to-Noise Ratio (SNR).

Key words: communication, underwater acoustic communications, multiple input multiple output (MIMO), orthogonal frequency-division multiplexing (OFDM), concatenated coding

CLC Number: 

  • TN929.3
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