光子学报, 2016, 45 (4): 0406003, 网络出版: 2016-05-11
非二进制低密度奇偶校验码在16QAM光传输系统中的性能
Performance of Non-binary Low Density Parity Check Codes in 16QAM Optical Transmission Systems
光通信 低密度奇偶校验码 高阶调制 纠错性能 译码效率 Optical communications Low density parity check codes High-order modulation Error correction performance Decoding efficiency
摘要
以16-相正交幅度调制（16QAM）为例，分析比较了伽罗华（GF(2m)）域上m=1,2,4时，3种低密度奇偶校验（LDPC）码在16QAM光传输系统中的性能.分析表明，无论在纠错性能还是译码效率方面，4进制LDPC码比16进制LDPC码具有更大优势.为进一步改善高阶调制光传输系统中非二进制低密度奇偶校验（NB-LDPC）码的性能，在16QAM系统下的4进制LDPC码中引入水印位符号.与传统的非二进制LDPC译码方案相比，水印位方案的平均迭代次数显著下降，即引入水印位可以极大地提高NB-LDPC码的译码效率.当误码率BER=10-5时水印位方案可以改善0.1 dB的净编码增益.
Abstract
Taken 16 Quadrature Amplitude Modulation (16QAM) as an example, the performance of three kinds of LDPC codes over Galois fields (GF(2m)) for m=1,2,4 in 16QAM systems was analyzed. The simulation results show that 4-ary LDPC code, rather than 16-ary LDPC, shows significant advantages in both error correction performance and decoding efficiency. Then in order to further improve the performance of NB-LDPC codes in high-order modulation systems, the watermark symbols are introducted into 4-ary LDPC codes in 16QAM systems. Compared with traditional non-binary LDPC decoding, the average iteration number of watermark scheme presents a quite obvious decrease, it means that the decoding efficiency can be greatly improved by using watermark scheme. Moreover a further Net Code Gain (NCG) improvement of about 0.1 dB can be attained when bit error ratio BER=10-5.
王黎明, 乔耀军, 张文博. 非二进制低密度奇偶校验码在16QAM光传输系统中的性能[J]. 光子学报, 2016, 45(4): 0406003. WANG Li-ming, QIAO Yao-jun, ZHANG Wen-bo. Performance of Non-binary Low Density Parity Check Codes in 16QAM Optical Transmission Systems[J]. ACTA PHOTONICA SINICA, 2016, 45(4): 0406003.
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