摘要
针对卫星通信对高可靠性纠删码的需求,文章提出了一种联合RaptorQ码和物理层信道编码的级联方案。在综合考虑纠错性能和复杂度的情况下,采用物理层编码构造等效删除信道,并选取长度可变且具有线性编译码复杂度的RaptorQ码以实现纠删功能。阐述了RaptorQ码的编译码原理和预编码算法,分析了级联RaptorQ码系统的纠错性能。理论分析和仿真结果表明,与现有同类级联喷泉码算法相比,所提方案具有较低的编译码复杂度和更好的纠错性能,在相同信道条件下成功译码所需的编码冗余更低。
A concatenated scheme of RaptorQ code and physical layer channel coding is put forward for the requirement of erasure correcting codes in satellite communications. Considering the perform- ance and complexity of the scheme, physical layer channel coding is used for the construction of era- sure channels, and RaptorQ code is selected for the correction of erasure errors. The coding theory and precoding algorithm of RaptorQ codes are introduced and the error-correcting capability of the concatenated scheme is analyzed. Theoretical analysis and simulation results demonstrate that, com- pared with the existing concatenated fountain codes, the proposed scheme has simpler decoding com- plexity and higher error-correcting performance, and needs lower redundancy for successful decoding in the same channel conditions.
出处
《信息工程大学学报》
2013年第3期306-311,共6页
Journal of Information Engineering University
基金
国家863计划资助项目(2009AA011205)
关键词
卫星通信
前向纠错
RaptorQ码
级联码
satellite communications
forward error correction
RaptorQ code
concatenated code
