动态频谱抗干扰系统在部分频带干扰下的性能

Performance of Dynamic Spectrum Anti-jamming Systems Under Partial-Band Noise Jamming

为了评估动态频谱抗干扰新体制在抗干扰通信中的性能,采用理论分析与仿真相结合的方法,研究了动态频谱抗干扰系统在部分频带干扰下的信道容量及比特误码率,并将其与常规跳频系统在部分频带干扰下的信道容量及比特误码率进行了比较.结果表明:在很宽的部分频带干扰因子取值范围内,动态频谱抗干扰系统的信道容量均大于常规跳频系统的信道容量,即使动态频谱抗干扰系统无干扰状态信息,其信道容量也大于有干扰状态信息的常规跳频系统的信道容量;在中高信干比处,动态频谱抗干扰系统在最坏情况部分频带干扰下的比特误码率低于常规跳频系统;同时,纠错编码还可以为动态频谱抗干扰系统的性能带来进一步的改善.

In order to evaluate the performance of the new dynamic spectrum anti-jamming（DSAJ） system in anti-jamming communications,channel capacity and bit error rate（BER） of DSAJ systems under partial-band noise jamming are studied via theoretical analysis and simulations.Capacity and BER of both DSAJ systems and conventional frequency hopping（FH） systems are compared.Results show that within a wide range of partial-band jamming factor values,DSAJ systems achieve larger capacity than FH systems.Even without jammer state information（JSI）,DSAJ systems still achieve larger capacity than FH systems with JSI.At medium to high signal-to-jamming ratios（SJR）,DSAJ systems achieve smaller BER than FH systems under worst-case partial-band jamming.Moreover,error correction coding can further improve the performance of DSAJ systems.