便携无线通信设备窄带干扰抑制关键技术研究与验证

发布时间：2018-08-08 16:15

【摘要】：现代信息化战争是电子对抗技术的比拼,研发一种能够抑制特定类型干扰的专用通信系统显得尤为重要。直接序列扩频技术凭借抗干扰能力强、抗多径衰落等特点,在军事通信中得到了广泛应用。但是当窄带干扰功率超过系统的干扰容限时,通信性能将急剧恶化,甚至失效。因此,为了提高战时通信的可靠性和有效性,必须在直扩系统中进行抗干扰处理。为此,论文基于直扩系统的抗干扰研究,设计了针对窄带干扰和跳频干扰的改进码辅助算法。在FPGA硬件平台上实现了干扰抑制方案,并对功能和性能进行了分析与测试。本文的研究工作和取得的研究结果如下:首先,以直扩通信系统为基础,对码辅助技术和频域陷波技术进行了理论分析,通过自相关矩阵(二阶矩)辅助和延时分路对码辅助技术进行改进,并仿真了两种技术对窄带干扰和跳频干扰的抑制性能。仿真结果如下:在满足SNR等于10dB和BER小于10-5的条件下,码辅助技术能抑制带宽为10kHz、干信比为22dB的数字调制干扰,频域陷波技术能抑制带宽为1kHz、干信比为9dB的数字调制干扰,码辅助技术性能优于频域陷波技术;对于带宽为2MHz、速率为250hops/s的跳频干扰,码辅助技术能抑制的最大干信比为11dB。其次,详细设计了码辅助干扰抑制关键技术实现方案。以便携无线通信链路为基础,设计了软件的总体架构。分析了自动增益控制和时间同步等关键模块的处理流程,并给出了该方案的资源消耗。最后,在便携无线通信设备上完成了窄带干扰抑制方案的功能与性能测试。结果表明,干扰抑制软件实现了输入功率控制功能;而且,在SNR等于10dB和BER小于10-5的条件下,码辅助技术对单音干扰和数字调制干扰的抑制性能损失分别为9dB和6dB,对跳频干扰的抑制性能损失约为1.7dB,不满足性能需求。论文研究的窄带干扰抑制技术成功地应用到了便携无线通信链路中,对通信质量有一定程度的提高,具有实用性和可移植性,为后续的研究提供了理论和应用上的参考。
[Abstract]:Modern information warfare is the competition of electronic countermeasure technology, so it is very important to develop a special communication system which can suppress certain types of interference. Direct sequence spread spectrum (DSSS) technology has been widely used in military communication due to its strong anti-interference and anti-multipath fading. However, when the narrowband interference power exceeds the interference capacity limit of the system, the communication performance will deteriorate sharply or even fail. Therefore, in order to improve the reliability and effectiveness of wartime communication, anti-jamming must be carried out in DS system. Therefore, based on the anti-jamming research of DSSS system, an improved code assistant algorithm for narrowband interference and frequency-hopping interference is designed. The interference suppression scheme is implemented on the FPGA hardware platform, and the function and performance are analyzed and tested. The research work and results obtained in this paper are as follows: firstly, based on the direct spread spectrum communication system, the code assistant technology and the frequency domain notch technology are analyzed theoretically. The Auto-correlation Matrix (second order moment) assistant and delay splitter are used to improve the code-assisted technique, and the performance of the two techniques to suppress narrowband interference and frequency-hopping interference is simulated. The simulation results are as follows: under the condition that SNR is equal to 10dB and BER is less than 10 ~ (-5), the code assisted technique can suppress digital modulation interference with bandwidth of 10 kHz and ratio of 22dB, and frequency domain notch technique can suppress digital modulation interference with bandwidth of 1 kHz and dry-signal ratio of 9dB. The performance of code-assisted technique is better than that of frequency-domain notch technique, and the maximum dry signal ratio can be suppressed 11dB for FH interference with bandwidth of 2MHz and rate of 250hops/s. Secondly, the key technologies of code-assisted interference suppression are designed in detail. Based on the portable wireless communication link, the software architecture is designed. The processing flow of the key modules, such as automatic gain control and time synchronization, is analyzed, and the resource consumption of the scheme is given. Finally, the function and performance of narrowband interference suppression scheme are tested on portable wireless communication equipment. The results show that the interference suppression software achieves the input power control function, and when SNR is equal to 10dB and BER is less than 10-5, The performance loss of single tone interference and digital modulation interference is 9dB and 6 dB, respectively, and the performance loss of frequency hopping interference is about 1.7 dB, which does not meet the performance requirements. The narrowband interference suppression technique studied in this paper has been successfully applied to the portable wireless communication link, which improves the communication quality to a certain extent, and has practicability and portability, which provides a theoretical and practical reference for further research.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN914.42

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