Volume 38, Number 3, June 2020
|Page(s)||627 - 633|
|Published online||06 August 2020|
Research on Degree Distribution Optimization of LT Codes
School of Informatics, Xiamen University, Xiamen 361005, China
2 School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China
3 Southeast University, School of Economics and Management, Nanjing 211189, China
LT code, as a channel coding scheme with good adaptability to the channel, has a stable performance in data transmission of underwater acoustic communication. In the case of large decoding overhead, the LT code can reach the ideal bit error rate(BER), but when the length of the encoded data is short, its coding and decoding performance is not ideal. LT code was applied to underwater acoustic communication by combining with orthogonal frequency division multiplexing (OFDM), and a LT-OFDM system was constructed. To improve the performance of LT code in the case of short code length, a method for degree distribution optimization was proposed on the objective of minimizing BER and minimizing average coding degree. Simulation and sea trial results show that under the same BER this method can optimize the system, transform 7%-22% conversion, and reduce the complexity of coding and decoding.
Key words: LT code / orthogonal frequency division multiplexing(OFDM) / underwater acoustic communication / degree distribution
关键字 : LT码 / 正交频分复用 / 水声通信 / 度分布
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