NBJ抑制的QC-LDPC协同混沌DSSS方案  

Cooperated NBJ suppression scheme based on QC-LDPC codes and chaotic DSSS

作　　者：李思佳[1] 毛玉泉[1] 李波[1] 郑秋容[1] 

机构地区：[1]空军工程大学电讯工程学院,西安710077

出　　处：《计算机工程与应用》2012年第31期125-130,共6页Computer Engineering and Applications

基　　金：国家自然科学基金(No.60802053);陕西省电子信息系统综合集成重点实验室基金(No.201102Y05);空军工程大学电讯工程学院博士启动基金(No.DG080806);空军工程大学电讯工程学院科研创新基金(No.DYCX1040)

摘　　要：为改善低信噪比窄带干扰条件下的信息传输性能,在现阶段宽带数据链的基础上,提出了一种结合QC-LDPC和混沌DSSS的协同窄带干扰抑制方案。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Moore-Penrose逆——满秩分解方法完成了QC-LDPC的编码;针对直序扩频系统,在分析了改进型Logistic映射序列性能的基础上,使用混沌扩频序列提高抗干扰能力。仿真验证了该方案的有效性,结果表明:在JSR为20dB时,与现阶段传输标准相比,该方案可以获得8.2dB的信噪比增益。A cooperated narrow-band jamming suppression scheme is proposed based on Quasi-Cyclic Low Density Parity Check codes（QC-LDPC） and chaotic direct sequence spread spectrum for improving the data transmitting in the low SNR with the different jamming. The QC-LDPC encodes are designed through the Moore-Penrose inverse and the full rank decomposition based on the parity check matrix. 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 Logistic MAP, is analyzed and verified by simulations. Simulation results demonstrate that the scheme can bring 8.2 dB SNR gain comparing to current standard when the jamming-to-signal ratio is 20 dB.

关 键 词：准循环低密度奇偶校验码(QC-LDPC) 直接序列扩频(DSSS) MOORE-PENROSE逆 改进型Logistic映射 通用数据链 

分 类 号：TN911[电子电信—通信与信息系统]