摘要
文中介绍了LDPC码的构造及其译码原理,该码在中短码长时具有很强的纠错能力,将其与图像传输相结合,能够达到很好的图像传输质量。仿真实现了在AWGN信道下规则LDPC码的图像传输系统,用四种译码算法对LDPC码的性能做了仿真,并将其在图像传输中的效果做了比较。仿真结果发现,LDPC码采用不同的译码算法输出图像的效果是不一样的。
This paper describes LDPC codes and their encoding and decoding principles. The LDPC codes have good error correcting ability at moderate or short length. When applied in image transmission, the polluted image could be completely recovered. A simulation on LDPC code in decoding algorithm is made, the LDPC code is applied in image transmission system over the AWGN channel, and its effects in the image transmission is analyzed. Simulation results show that the LPC code of different decoding algorithms could achieve quite different image effects.
出处
《通信技术》
2010年第1期32-33,37,共3页
Communications Technology
关键词
低密度奇偶校验码
图像传输
最短长度环
low-density parity-check code
image transmission
shortest cycles
