基于双层压缩感知的有损无线链路稀疏信号传输

发布时间：2018-01-13 03:29

本文关键词：基于双层压缩感知的有损无线链路稀疏信号传输　出处：《通信学报》2017年04期 　论文类型：期刊论文

【摘要】：在资源受限的无线传感器网络中,低质量的无线链路严重限制了其大规模应用。基于WSN监测信号普遍具有的稀疏特性,提出了基于双层压缩感知(double process of compressive sensing)的有损无线链路稀疏信号传输架构,探索低质量无线链路下实时、高精度和高能效的稀疏信号传输方法。首先,将稀疏信号传输过程中的随机分组丢失现象建模为压缩感知的线性降维观测过程(被动CS过程)。然后,针对WSN为提高传输效率而采用的长数据分组,数据发送前在发送端引入线性随机降维投影——简易的信源编码操作(主动CS过程),避免块状数据丢失的发生。最后,接收端根据收到的有损数据利用压缩感知的方法重构原始信号。进一步根据压缩感知重构和无线通信的相关原理,推导出允许使用的发送端最小压缩率和最大分组长度。大量仿真实验表明,所提方法不仅可以保证数据的可靠准确传输,还能减小发送数据量,降低传输时延和节点能耗。
[Abstract]:In resource constrained wireless sensor networks, wireless link low quality seriously limit its large-scale application. Sparse characteristics generally have WSN monitoring signal based on compressed sensing is proposed based on the double (double process of compressive sensing) lossy wireless link sparse signal transmission structure, explore the low quality of the wireless link under real-time, high the accuracy and high efficiency of the sparse signal transmission method. First, the random packet sparse signal transmission in the process of modeling the phenomenon of missing dimension observation process for linear compressed sensing (passive CS). Then, a long packet for WSN to improve the transmission efficiency and the use of the data before sending the sending end into linear random drop - dimensional projection source encoding simple operation (active CS process), to avoid the occurrence of massive data loss. Finally, the receiving end according to the received data are compressed by a sense of loss The method to reconstruct the original signal. According to the principle of compressed sensing reconstruction and wireless communications, transmission allows the use of derived end minimum compression ratio and the maximum packet length. Simulation results demonstrate that the proposed method can not only ensure the accuracy and reliability of data transmission, but also reduce the amount of transmitted data, reducing transmission delay and energy consumption.

【作者单位】：浙江大学工业控制技术国家重点实验室;
【基金】：国家自然科学基金资助项目(No.61273079) 国家自然科学重点基金资助项目(No.U1509215) 工业控制技术国家重点实验室开放课题基金资助项目(No.ICT170319,No.ICT170320,No.ICT170342)~~
【分类号】：TP212.9;TN929.5
【正文快照】： Foundation Items:The National Natural Science Foundation of China(No.61273079),The National Natural Science Key Founda-tion of China(No.U1509215),The Open Project of State Key Laboratory of Industrial Control Technology(No.ICT170319,No.ICT170320,No.ICT17

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