Wideband spectrum sensing using step-sampling based on the multipath nyquist folding receiver  

作　　者：Kai-lun Tian Kai-li Jiang Sen Cao Jian Gao Ying Xiong Bin Tang Xu-ying Zhang Yan-fei Li 

机构地区：[1]University of Electronic Science and Technology of China,Chengdu,611731,China [2]China Electronics Technology Group Corporation 29th Research Institute,Chengdu,610036,China

出　　处：《Defence Technology（防务技术）》2024年第1期523-536,共14页Defence Technology

基　　金：supported by the Key Projects of the 2022 National Defense Science and Technology Foundation Strengthening Plan 173 (Grant No.2022-173ZD-010);the Equipment PreResearch Foundation of The State Key Laboratory (Grant No.6142101200204)。

摘　　要：Wideband spectrum sensing with a high-speed analog-digital converter(ADC) presents a challenge for practical systems.The Nyquist folding receiver(NYFR) is a promising scheme for achieving cost-effective real-time spectrum sensing,which is subject to the complexity of processing the modulated outputs.In this case,a multipath NYFR architecture with a step-sampling rate for the different paths is proposed.The different numbers of digital channels for each path are designed based on the Chinese remainder theorem(CRT).Then,the detectable frequency range is divided into multiple frequency grids,and the Nyquist zone(NZ) of the input can be obtained by sensing these grids.Thus,high-precision parameter estimation is performed by utilizing the NYFR characteristics.Compared with the existing methods,the scheme proposed in this paper overcomes the challenge of NZ estimation,information damage,many computations,low accuracy,and high false alarm probability.Comparative simulation experiments verify the effectiveness of the proposed architecture in this paper.

关 键 词：Wideband spectrum sensing Sub-Nyquist sampling Step-sampling Nyquist folding receiver(NYFR) Multisignal processing 

分 类 号：TN925[电子电信—通信与信息系统] E91[电子电信—信息与通信工程]