RaptorQ码级联方案在卫星通信中的应用

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。

Application of the RaptorQ Codes Concatenation in Satellite Communications

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.