| 摘要: |
| 在现代无线通信系统中，通常采用突发通信方式来提高系统抗干扰能力。非合作通信条件下，接收信号的信号类型未知和信噪较低导致检测性能较差。为了改善非合作突发信号检测性能，提出了一种结合双滑窗和延时自相关的双重检测算法，先用能量检测法对序列进行粗检，再用延时自相关进行精检。该能量检测算法是在经典双滑窗能量检测基础上，增加了一个对检测序列进行了延时相加的预处理来提高阈值。实验仿真证实了改进后的检测算法在-7 dB信噪比以上都具有很好的检测性能，并且在噪声数据占比高的突发通信中，运行速度是延时自相关检测的好几倍。因此，在非合作通信中算法具有较好的性能和较高的效率。 |
| 关键词: 非合作通信 突发信号 低信噪比 双滑窗能量检测 自相关检测 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61501288） |
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| A dual detection algorithm for weak burst signals in non-cooperative communication |
| GUO Tingying,CHEN Yongfeng,LIU Kai |
| (Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China;Shanghai Branch of Southwest Electronics and Telecommunication Technology Research Institute,Shanghai 200434,China) |
| Abstract: |
| In modern wireless communication systems,burst communication is usually used to improve system anti-interference ability.In non-cooperative communication,the unknown signal type of the signal received and the low signal-to-noise ratio(SNR) lead to poor detection performance.In order to improve the performance of non-cooperative burst signal detection,this paper proposes a dual detection algorithm combining double sliding window and delayed self-correlation.The algorithm first uses energy detection method to perform simple detection on the sequence,and then uses delayed self-correlation for detailed examination.Based on the classic double sliding window energy detection,the energy detection algorithm adds a pretreatment which delays and adds the detection sequence to increase the threshold.The experimental simulation shows that the improved detection algorithm has good detection performance above -7 dB SNR,and in burst communication with large amount of noise data,the running speed is several times that of delayed self-correlation detection.Therefore,this algorithm has better performance and higher efficiency in non-cooperative communication. |
| Key words: non-cooperative communication burst signal low SNR double sliding windows energy detection self-correlation detection |
《电讯技术》编辑部 