Performance Analysis of Repeat-Accumulate Codes over Shallow Water Acoustic Channels

doi:10.3969/j.issn.1000-1093.2012.02.008

Abstract

Abstract: Due to a large delay spread caused by multipath propagation and severe attenuation of the channel conditions, the Repeat-Accumulate (RA) code with short length codes, good performance and easy implementation has been proposed to enhance the reliability of the shallow water acoustic (SWA) communication system. A system model including RA coding over the SWA channels was established. As a comparison, the performance of RA codes under different ocean acoustic channel conditions was presented. The experiment in the pool was carried out to show how the encoding and decoding parameters affect the performance of RA codes, which was verified by the image transmission over channels in the pool tank. The simulation and experimental results show that RA codes have a strong error correction capability and the codes with appropriate parameters would further improve the coding gain, while they enjoy encoding and decoding in linear time and have simple hardware implementation, which have a good applied prospect in underwater acoustic communication system.

Key words: communication technology, channel coding, repeatedly-accumulated code, shallow water acoustic channel, underwater acoustic communication

CLC Number:

TN929.3

ZHANG Lan， XU Xiao-mei， FENG Wei， CHEN You-gan. Performance Analysis of Repeat-Accumulate Codes over Shallow Water Acoustic Channels[J]. Acta Armamentarii, 2012, 33(2): 179-185.

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