比特交错技术与符号交错技术在多级编码调制方案中的性能比较

The Performance Comparison of the Multilevel Coding Using Bit Interleaving and Symbol Interleaving

为有效解决多级译码引起的错误传播问题 ,我们采用分组分割方法 ,将比特交错技术与符号交错技术应用到多级编码调制方案中 ,对采取这两种方案的BCH多级编码调制方案在Rayleigh衰落信道中的抗干扰性能进行了研究 ,并且对两种技术在相同编码效率、相同交错深度下的结果作了比较 .计算机仿真结果表明 :在理想信道下 ,比特交错技术与符号交错技术在多级编码调制方案中的性能基本相同 。

In order to overcome the error propagation which suffers from the multistage decoding,we make use of bit interleaving and symbol interleaving applied in the multilevel coding with block partition.The anti interference performance of BCH multilevel coding using these two schemes over Rayleigh fading channel is researched and compared with the results of the two interleaving which has the same coding rate and the same interleaving degree.The results simulated by computer show that the performance of multilevel coding with two interleaving in the ideal fading channel are same.Moreover,the performance of multilevel coding using interleaving has a better improvement than the scheme without using interleaving.