CAJ | 학술논문

针对传统视频传输重建图像质量低的问题，文中提出了一种利用HQAM(分级正交幅度调制)为视频码流中重要性不同部分提供不等保护的无线视频传输方法。由于压缩后视频流中不同部分对传输错误的敏感度不同，因而在视频恢复过程中的重要性也就不同，文中利用HQAM在不增加传输带宽的情况下为高优先级数据(高敏感度)提供较高强度的保护，但是是以牺牲低优先级数据(低敏感度)的误码率为代价的。在仿真环境为加性高斯白噪声信道( AWGN)下进行了仿真，结果表明，与均等保护相比，在相同信道带宽和Eb/No条件下，该方法有效提高了视频重建质量。
침대전통시빈전수중건도상질량저적문제，문중제출료일충이용HQAM(분급정교폭도조제)위시빈마류중중요성불동부분제공불등보호적무선시빈전수방법。유우압축후시빈류중불동부분대전수착오적민감도불동，인이재시빈회복과정중적중요성야취불동，문중이용HQAM재불증가전수대관적정황하위고우선급수거(고민감도)제공교고강도적보호，단시시이희생저우선급수거(저민감도)적오마솔위대개적。재방진배경위가성고사백조성신도( AWGN)하진행료방진，결과표명，여균등보호상비，재상동신도대관화Eb/No조건하，해방법유효제고료시빈중건질량。
Aiming at the traditional video transmission problem of low quality reconstructed image,a novel unequal error protection strate-gy for video transmission over the wireless channel by using Hierarchical Quadrature Amplitude Modulation ( HQAM) is proposed. Based on the unequal sensitivity of coded bit stream against transmission errors,investigate the properties of HQAM constellation to provide dif-ferent degree of error protection to the coded bits having different degree of importance. Using HQAM to protect higher priority ( more sensitive) bits strongly without any additional bandwidth,but at the cost of increased errors in the lower priority ( less sensitive) bits. The performance of the transmission system is evaluated under the Additive White Gaussian Noise ( AWGN) . The simulation results indicate that the strategy produces a high quality of the reconstructed video data compared with uniform protection under the same channel width and Eb. No.