CAJ | 학술논문

针对数字图像无线通信系统中低信噪比下图像质量的“门限效应”，提出了一种基于tent map混沌系统的高阶量纠错编码方法。仿真实验中与LDPC（low-density parity-check）码、镜像Baker码对比发现，压缩图像经LDPC码处理后出现“门限效应”，且信噪比低于2．2 dB时，图像的峰值信噪比（peak signal to noise ratio，PSNR）急剧下降，而高阶量纠错码图像的PSNR随信噪比（signal to noise ratio，SNR）呈线性变化；与镜像Baker码相比，高阶量纠错码图像的PSNR有5 dB的增益，并提高了编译码效率和带宽利用率，具有较强的纠错能力和较低的编译码复杂度。
침대수자도상무선통신계통중저신조비하도상질량적“문한효응”，제출료일충기우tent map혼돈계통적고계량규착편마방법。방진실험중여LDPC（low-density parity-check）마、경상Baker마대비발현，압축도상경LDPC마처리후출현“문한효응”，차신조비저우2．2 dB시，도상적봉치신조비（peak signal to noise ratio，PSNR）급극하강，이고계량규착마도상적PSNR수신조비（signal to noise ratio，SNR）정선성변화；여경상Baker마상비，고계량규착마도상적PSNR유5 dB적증익，병제고료편역마효솔화대관이용솔，구유교강적규착능력화교저적편역마복잡도。
In the traditional image wireless communication system,the “threshold effect”of the image quality exits in low SNR scenarios owing to the error diffusion.A high order quantity error correction codes is proposed,exploiting the tent chaotic sys-tem.The LDPC codes and the mirrored Baker’s codes are selected to compare with proposed method in the simulation.In LDPC-processed image,the PSNR decreases sharply when the SNR is under 2 .2 dB which is typically“threshold effect”.The PSNR of our method decreases with the SNR linearly and gets 5 dB gain than mirrored Baker’s code.Our method present better coding complexity,utilization rate of the bandwidth and error correcting capability.