自适应压缩频谱感知的采样率动态调整策略  

Sampling rate dynamic adjustment strategy in adaptive compressed spectrum sensing

作　　者：梁燕[1,2] 彭川桂 王光宇 邵凯[1,3] LIANG Yan;PENG Chuangui;WANG Guangyu;SHAO Kai(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China;Chongqing Key Laboratory of Signal and Information Processing,Chongqing 400065,P.R.China;Chongqing Key Laboratory of Mobile Communications Technology,Chongqing 400065,P.R.China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]信号与信息处理重庆市重点实验室,重庆400065 [3]移动通信技术重庆市重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2024年第5期915-923,共9页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

摘　　要：受奈奎斯特-香农采样定理的限制,宽带频谱感知(wideband spectrum sensing,WBSS)的首要难点是采集宽带信号。根据变步长自适应滤波算法原理,基于自适应压缩频谱感知(adaptive compressed spectrum sensing,ACSS)提出了一种动态调整采样率的压缩频谱感知方法(dynamically adjust sampling rate ACSS,DASR-ACSS)。采用调制宽带转换器结构,针对传统ACSS固定步长的问题设计了步长动态调整策略。针对原始信号难以获取的问题,通过对信道占用状态相关性和检测率的变化趋势进行数据统计分析,设计了利用信道占用状态相关性的停止准则;通过对停止准则的实验数据分析,以sigmoid函数为基础设计了分段函数作为步长调整策略,利用步长补偿因子充分提升性能。仿真结果表明,与传统ACSS相比,DASR-ACSS能更快达到高检测率,能够平衡算法的实时性能和采样率压缩比性能,当信噪比在-30~30 dB时,DASR-ACSS表现出更好的检测性能。Due to the Nyquist-Shannon theorem,the primary problem in wideband spectrum sensing(WBSS)is the acquisition of wideband signals.According to the principle of variable-step adaptive filtering algorithm,this paper proposes a dynamically adjustable sampling rate method for adaptive compressed spectrum sensing(DASR-ACSS).The structure of modulated wideband converter is adopted and a step dynamic adjustment strategy is designed to solve the fixed step size problem of traditional ACSS.For the problem of acquiring the original signal,the stop criterion using the correlation of channel occupancy state is designed by statistically analyzing the change trend of the channel occupancy states correlation and detection rate.Through the experimental analysis of the stop criterion,the segmentation function is designed as a step adjustment strategy based on the sigmoid function,and the step compensation factor is designed to improve the performance.Simulation results show that compared with the traditional ACSS method,DASR-ACSS can achieve a high detection rate more rapidly,and can balance the real-time performance and sample rate compression ratio performance.When the SNR is between-30 dB and 30 dB,DASR-ACSS exhibits better detection performance.

关 键 词：宽带频谱感知 压缩感知 自适应频谱感知 采样率动态调整策略 

分 类 号：TN925[电子电信—通信与信息系统]