CAJ | 학술논문

针对JPEG2000码流的渐进传输特性,提出了一种多参数优化的联合信源信道编码方法,即MPO-JSCC.在码率分配的基础上,动态地选择Turbo码交织长度、迭代译码次数,通过优化编码器多个参数更好地执行不等差错保护策略,同时加入JPEG2000容错工具,在接收端利用错误掩藏机制以提高图像解码成功率.将该方法应用于噪声信道的图像传输系统中,仿真结果表明,MPO-JSCC既能在不增加系统复杂度及延迟时间的同时提高重建图像的质量,又能节省系统发射功率,具有一定的现实指导意义.
침대JPEG2000마류적점진전수특성,제출료일충다삼수우화적연합신원신도편마방법,즉MPO-JSCC.재마솔분배적기출상,동태지선택Turbo마교직장도、질대역마차수,통과우화편마기다개삼수경호지집행불등차착보호책략,동시가입JPEG2000용착공구,재접수단이용착오엄장궤제이제고도상해마성공솔.장해방법응용우조성신도적도상전수계통중,방진결과표명,MPO-JSCC기능재불증가계통복잡도급연지시간적동시제고중건도상적질량,우능절성계통발사공솔,구유일정적현실지도의의.
The paper presented a multi-parameter optimized joint source channel coding method (MPO-JSCC), combined with JPEG2000 and Turbo codes for image transmission. On the basis of conventional layered-rate allocation mechanism, also chose the interleave length and iterative decoding times dynamically, according to the importance of that quality scalable bitstream for image recovery. Introduced the error resilient tools JPEG2000 provided to improve the image reconstruction ratio at the receiving end. Compared to the approaches reported in the literature, the MPO-JSCC method gives better compression efficiency while having higher coding gain, and reduces the transmission power budget.