为实现干扰条件下低信噪比的通用数据链信息可靠传输,提出了一种基于QC-LDPC和CDSSS的通用数据链协同抗干扰方案;该方案在提出单位阵取反变换的直积构造方法来生成校验矩阵的基础上,采用LU分解方案完成了QC-LDPC的编码,使用Min-Sum算法完成译码;在直序扩频系统中分析了Chebyshev混沌映射序列性能和优选方法,采用优选的混沌扩频序列提高抗干扰能力；最后通过不同干扰条件的仿真验证了方案的有效性,结果表明,协同方案比相同条件下的Mackay码字性能更优.%A cooperative anti-jamming scheme of common data link (CDL) is proposed based on QC-LDPC and chaotic direct sequence spread spectrum for transmitting the data in the low SNR environment. The QC-LDPC encode is completed through the LU decomposition based on the parity check matrix. The Min- Sum algorithm is used to decode. The inverse transform for identity matrix and direct product are used for constructing the parity check matrix. The performance of chaotic spread spectrum sequences, produced from improved Cheby-shev MAP, is analyzed and their optimized selection algorithm is proposed. Finally, the scheme is verified using simulations with different jamming and results indicate that the cooperative scheme performance is better than the Mackay codes with the same conditions.
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