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Expected spatio-temporal variation of groundwater deficit by integrating groundwater modeling, remote sensing, and GIS techniques

Relative shannon’s entropy approach for quantifying urban growth using remote sensing and gis: a case study of cuttack city, odisha, india, review of conceptual models of estimating the spatio-temporal variations of water depth using remote sensing and gis for the management of dams and reservoirs, temporal assessment of sedimentation in siruvani reservoir using remote sensing and gis, evaluating the groundwater potential of wadi al-jizi, sultanate of oman, by integrating remote sensing and gis techniques, diachronic study of land cover of the medjerda watershed and estimation of rusle-c factor using ndvi-based equation, remote sensing, and gis, slum categorization for efficient development plan—a case study of udhampur city, jammu and kashmir using remote sensing and gis, morphometric analysis of damodar river sub-watershed, jharkhand, india, using remote sensing and gis techniques, land use/land cover change detection and validation of swat model on vishow sub-basin using remote sensing and gis techniques, zoning groundwater potential recharge using remote sensing and gis technique in the red river delta plain.

Abstract The Red River delta plain is the second largest delta in Vietnam and is located in the North of the country with an area of 14,860 km2 and residing more than 22.5 million inhabitants. Groundwater is mainly exploited in Quaternary sedimentary aquifers with a total discharge of about 3 million m3/day. Some localities have shown signs of over-exploitation such as in Hanoi and in Nam Dinh, which may lead to related problems such as depletion, subsidence, saltwater intrusion, and water pollution. In order to be able to sustainably exploit groundwater, the groundwater potential recharge needs to be estimated. There have been many studies using different methods to estimate the groundwater recharge and to zone potential recharge. In the study area, there are several studies for groundwater recharge, but some are still uncertain because of using indirect methods, some are locally estimated in specific areas. Therefore, the objective of this study is to apply remote sensing and GIS to zone the groundwater potential recharge and its verification by using radioactive isotope 3H analysis in the Red River delta plain. Various types of satellite images have been used and interpreted to detect the different thematic layers which concern the groundwater potential recharge. GIS has been applied as a platform for analysis and integration of thematic layers for zonation, finally. Field trip and water sampling for chemical and radioactive 3H analysis were also conducted. Zones with low, moderate, and high groundwater potential recharge have been delineated with good agreement from the direct estimation of groundwater recharge by radioactive isotopes 3H.

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The role of satellite remote sensing in climate change studies

  • Jun Yang 1 ,
  • Peng Gong 1 , 2 , 3 ,
  • Rong Fu 4 ,
  • Minghua Zhang 5 ,
  • Jingming Chen 6 , 7 ,
  • Shunlin Liang 8 , 9 ,
  • Bing Xu 8 , 10 ,
  • Jiancheng Shi 2 &
  • Robert Dickinson 4  

Nature Climate Change volume  3 ,  pages 875–883 ( 2013 ) Cite this article

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An Erratum to this article was published on 20 December 2013

A Corrigendum to this article was published on 29 October 2013

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Satellite remote sensing has provided major advances in understanding the climate system and its changes, by quantifying processes and spatio-temporal states of the atmosphere, land and oceans. In this Review, we highlight some important discoveries about the climate system that have not been detected by climate models and conventional observations; for example, the spatial pattern of sea-level rise and the cooling effects of increased stratospheric aerosols. New insights are made feasible by the unparalleled global- and fine-scale spatial coverage of satellite observations. Nevertheless, the short duration of observation series and their uncertainties still pose challenges for capturing the robust long-term trends of many climate variables. We point out the need for future work and future systems to make better use of remote sensing in climate change studies.

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In the version of this Review Article originally published, on page 877, the mass balance of glaciers in the Karakarom region should have been 0.11±0.2 m yr −1 . On page 879, in the second paragraph of the ‘Aerosols’ section, the estimated value for the direct radiative forcing should have been −1.0±0.34 W m −2 . These errors have now been corrected in the HTML and PDF versions of the Review Article.

02 December 2013

In the version of this Review Article originally published, the temperature anomaly trends for RSS and UAH in Fig. 2b,c should have been positive values. These errors have now been corrected in the online versions of the Review Article. In the previous corrigendum, the mass balance of glaciers in the Karakarom region should have read 0.11±0.22 m yr -1 .

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Acknowledgements

This work was supported by the National High-tech Research and Development Program of China (Grant No. 2009AA12200101) and the National Key Basic Research Program of China (Grant No. 2010CB530300).

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Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, 100084, China

Jun Yang & Peng Gong

State Key Lab of Remote Sensing Science, jointly sponsored by the Institute of Remote Sensing and Digital Earth, Chinese Academy of Science, and Beijing Normal University, Beijing, 100101, China

Peng Gong & Jiancheng Shi

Department of Environmental Science, Policy and Management, University of California, Berkeley, 94720, California, USA

Jackson School of Geosciences, University of Texas, Austin, 78712, Texas, USA

Rong Fu & Robert Dickinson

School of Marine and Atmospheric Sciences, State University of New York, Stony Brook, 11794, New York, USA

Minghua Zhang

International Institute for Earth System Science, Nanjing University, Nanjing, 210093, China

Jingming Chen

Department of Geography and City Planning, University of Toronto, Toronto, M5S 3G3, Ontario, Canada

College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100875, China

Shunlin Liang & Bing Xu

Department of Geography, University of Maryland, College Park, 20742, Maryland, USA

Shunlin Liang

College of Environmental Science and Engineering, Tsinghua University, Beijing, 100084, China

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J.Y. and P.G. designed the framework of the Review. All authors contributed to writing.

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Yang, J., Gong, P., Fu, R. et al. The role of satellite remote sensing in climate change studies. Nature Clim Change 3 , 875–883 (2013). https://doi.org/10.1038/nclimate1908

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Received : 23 October 2012

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Published : 15 September 2013

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DOI : https://doi.org/10.1038/nclimate1908

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A review of research on spectrum sensing based on deep learning.

sensing research papers

1. Introduction

  • Traditional approaches to radio spectrum sensing are studied, and a detailed summary of the strengths and weaknesses of each method is provided.
  • The applications of CNNs, long and short-term memory networks (LSTMs), combinatorial neural networks, and other types of neural networks in radio spectrum sensing are described. A comprehensive review of deep-learning-based spectrum-sensing algorithms for the period 2021 to 2023 is presented.
  • The paper concludes with a summary of the applications, current state of research, and challenges faced by deep learning in cooperative spectrum sensing.

2. Spectrum-Sensing Methods

2.1. spectrum-sensing modeling and performance metrics.

  • Detection probability ( P d ): This is the probability that a secondary user detects the presence of the primary user when the primary user is present, denoted by P d = P r H 1 ∣ H 1 .
  • False alarm probability ( P f ): This is the probability that a secondary user incorrectly believes that the primary user exists when the primary user does not exist, denoted by f = P r H 1 ∣ H 0 .
  • Missed detection probability ( P m ): This is the probability that a secondary user mistakenly believes that the primary user does not exist when the primary user exists, which can be expressed as P m = P r H 0 ∣ H 1 . The sum of the probability of having a detection and the probability of missing a detection is 1, which can be expressed as P m + P d = 1 .

2.2. Single-Node Spectrum Sensing

  • Spectrum monitoring and management: Single-node spectrum sensing monitors and manages spectrum utilization in specific frequency bands. It uses techniques to determine the utilization, interference, and possible availability of free spectrum in that band.
  • Spectrum sharing: Single-node spectrum sensing enables dynamic spectrum sharing. Nodes can monitor the available spectrum and share this information with other devices or networks to improve the efficient utilization of spectrum resources.
  • Interference detection and elimination: Single-node spectrum awareness detects potential sources of interference by monitoring the surrounding spectrum environment and taking appropriate measures to eliminate interference. This improves the performance and reliability of the communication system.
  • Traditional algorithms for single-node spectrum sensing mainly include energy detection algorithms, cyclostationary feature algorithms, and matched filter detection algorithms [ 25 ]. In the next section, these traditional methods are explained in detail, basic simulation experiments are performed, and finally, the advantages and disadvantages of each method are compared and summarized.

2.2.1. Energy Detection

2.2.2. cyclostationary feature detection, 2.2.3. matched filter detection.

  • PU signal uncertainty: Under the current spectrum management mechanism, each PU has absolute priority to use its working frequency band, and if a local node or secondary user requires prior knowledge of a PU’s signal, such as modulation coding method or timing, the PU is not obliged to provide it. Therefore, it is very difficult for the SUs to perceive the signal uncertainty in the PUs in the real spectrum.
  • Complexity of real environments: The spectrum sensing range of a single node is generally physically limited, as it may be influenced by propagation distance and large obstacles such as plateaus and trees. This limits the range and accuracy of the spectrum resources that nodes can perceive. In wide area communication systems, multiple nodes may need to be deployed to extend the sensing range.
  • Spectrum resource competition: A single node performing spectrum sensing may compete with other devices for the same spectrum resources. This can lead to a decrease in the accuracy of the spectrum sensing and may require additional coordination mechanisms to manage the allocation of spectrum resources.

2.3. Cooperative Spectrum Sensing

2.3.1. centralized cooperative spectrum detection, 2.3.2. distributed cooperative spectrum detection, 2.3.3. relay-assisted cooperative spectrum detection, 2.4. summary of conventional spectrum-sensing methods, 3. deep-learning-based spectrum-sensing methods, 3.1. application of convolutional neural networks to spectrum sensing, 3.1.1. convolutional neural networks, 3.1.2. spectrum-sensing method based on convolutional neural network.

  • A CNN-based spectrum-sensing method for signal time–frequency domain information

3.1.3. Residual Network

3.1.4. application of residual neural networks to spectrum sensing, 3.2. application of long short-term memory networks to spectrum sensing, 3.2.1. lstm, 3.2.2. lstm-based spectrum-sensing methods, 3.3. other neural networks in spectrum sensing, 4. deep-learning-based cooperative spectrum sensing, 4.1. applications of deep neural networks in cooperative spectrum sensing, 4.2. applications of deep reinforcement learning to cooperative spectrum sensing.

AuthorYearModulePerformanceApplication Scenario
W. Lee et al. [ ]2019CNN-DCSDCS (HD): Pd = 95% (Pf = 0.5); DCS (SD): Pd = 95.2% (Pf = 0.5)Under harsh sensing conditions, CSS with correlated individual spectrum sensing.
Chen Z et al. [ ]2020CSS-CNNPd = 90% (−16 dB, 20 SUs, Pf = 0.01)Distributed secondary users accept perceptual samples in severe channel fading and shadowing environments.
P. Shachi et al. [ ]2020CNNTest accuracy: 98.34% (scenario 3); 100% (scenario 2)Spectrum sensing performance analysis in dynamic scenarios with different noise floors and spaces.
Hang Liu et al. [ ]2019EL+semi-soft FCPd = 96% (−18 dB, 60 SUs)CSS for cognitive radio systems under OFDM-based signal.
Myke D. M. Valadão et al. [ ]2022ResNetAccuracy = 92% (NSD: −114 dBm −174 dBm, 5 SUs)Dynamic displacement of the user within a given area over a time period.
Raghunatha Rao D et al. [ ]2022Deep ResNet data-cleansing algorithmPd = 95.78% (the matrix size of 10 × 5, Rician channel)Sensing spectrum availability with crowd sensors via DNR.
Dimpal Janu et al. [ ]2023GCN-CSSPd = 100% (−8 dB, Pf = 0.1)Dynamics of the wireless environment in CR networks.
Shuai Liu et al. [ ]2021DDQNAverage cumulative collision rate = 0.06. Average cumulative reward = 0.91Dynamic cooperative spectrum-sensing environments where multiple PUs or multiple SUs can encounter conflicts.
Yunzeng Li et al. [ ]2020DQNModified decision accuracy = 100% (index of system scenarios = 2)Dynamic spectrum sensing in wireless networks containing N correlated channels.
Jalil S Q et al. [ ]2021CQLDetection accuracy = 70% (−14 dB)Improved detection accuracy of SUs against PUs and reduced energy consumption.
Cai P et al. [ ]2020DQN+ coordination graphAverage reward of the SUs in the CG = 0.29 (number of time slots = 1500)Certain obstacles in the physical environment allow CR to occur under the associated decay and shadows.
Anal Paul et al. [ ]2022DQLPd = 90% (−10 dB)FC in CSS is subject to data forgery attacks.
Yu Zhang et al. [ ]2019DQN+HCB-HAverage reward of all agents = 77% (number of time slots = 1500)Each SU gathers information from the environment and other SUs to determine its sensing strategy, which can be structured in two different time slots.

5. Performance Comparison of Conventional Methods and Deep-Learning-Based Spectrum Sensing

6. challenges and perspectives, 6.1. further improvement of detection performance and robustness at a low snr, 6.2. investigating the robustness of sensing systems under various malicious attacks, 6.3. study of spectrum sensing under small-sample conditions, 6.4. study of dynamic threshold settings, 6.5. further research on the application of self-encoders in spectrum sensing, 7. conclusions, author contributions, data availability statement, conflicts of interest.

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Click here to enlarge figure

ArticleYearMain Contribution
A Survey of Spectrum Sensing Algorithms for Cognitive Radio Applications [ ]2009Evaluating spectrum usage in multiple dimensions. It discussed the external sensing algorithms and other alternative sensing methods.
Spectrum Sensing Methods for Cognitive Radio Networks: A Review [ ]2017Several primary conventional spectrum-sensing techniques in CR are analyzed, and the effectiveness and shortcomings of some mature SS-CRN techniques are verified through simulation.
An Overview of Cooperative Spectrum Sensing based on Machine Learning Techniques [ ]2020Comparison of the performance of three machine learning algorithms with conventional spectrum-sensing algorithms under two channels, AWGN and Rayleigh.
An Overview of Deep Reinforcement Learning for Spectrum Sensing in Cognitive Radio Networks [ ]2021It presented a comprehensive overview of state-of-the-art research in the field of DRL for SS in CR. Proposing future challenges for deep reinforcement learning in spectrum sensing.
Machine Learning for Cooperative Spectrum Sensing and Sharing: A survey [ ]2021It summarized various ML-based algorithms in the CSS and DSS domains. It justifies the applicability of supervised, unsupervised, and reinforcement ML algorithms in the CSS domain.
Deep Neural Networks for Spectrum Sensing: A Review [ ]2023The paper describes the application of several DL algorithms to SS. The paper outlines the application of traditional ML algorithms with simple ANNs in SS The importance of RF datasets with migration learning is further discussed.
This Review2023Outlines and compares the conventional SS approach with the CSS approach. A comprehensive overview of the application and development of CNNs, LSTMs, and other deep neural networks in SS. Further overview of the application and development of deep neural networks and deep reinforcement learning in CSS.
Method of Spectrum SensingAdvantagesDisadvantages
Energy DetectionThe lowest complexity. Does not require pre-determined knowledge.Selection of the threshold for detecting primary users. Inability to differentiate interference from primary users and noise.
Matched Filter DetectionThe probability of false detection is achieved in a short time.It requires perfect knowledge of the PU signaling features. Large power consumption.
Cyclostationary Feature DetectionJust need to know the channel status information.Large amount of calculations and high complexity.
Spectrum SensingMethodApplicable Scenario
Single-node spectrum sensingEnergy detectionWhen the noise level in the system is known or can be estimated, or when the statistical information about the signal is not known.
Cyclostationary feature detectionSuitable for detecting cyclical signals, such as modulated signals and communication signals, as well as spectrum sensing in complex channel environments.
Matched filter detectionKnown master user signal information. High-phase synchronization.
Cooperative spectrum sensingCentralized cooperative spectrum sensingRelatively stable network structure and abundant device computing resources. There is a need for unified decision making based on sensed data. Scenarios with high requirements for security and monitoring of spectrum usage [ ].
Distributed cooperative spectrum detectionLocal information can be shared between cognitive nodes relatively frequently and fluently. Control channel resources are relatively abundant. Want to improve fault tolerance [ ].
Relay-assisted cooperative spectrum detectionEnvironments where certain nodes cannot communicate directly with the fusion center or other nodes due to geographic location or other factors [ ].
AuthorYearInputModelDetection ProbabilityAdvantage
Zhibo Chen et al. [ ]2021Time–frequency matrixSTFT-CNN90% (−15 dB, Pf = 0.1)Considerable SNR robustness. Independent of signal and noise assumptions.
Walid El-Shafai et al. [ ]2022Spectrogram images of the received signalsCNN98% (−10 dB)Can efficiently discriminate between signal and noise at different SNRs.
Lianning Cai et al. [ ]2022Spectrogram of the signal obtained by STFTS-CNN90% (−8 dB, Pf = 0.1)The method is insensitive to the modulation order.
Chang Liu et al. [ ]2022Sample covariance matrixCM-CNN93% (−14 dB, Pf = 0.1)The proposed scheme can automatically learn more discriminative features.
Qi Wang et al. [ ]2022Covariance matrix of the signalCNN-SVM97% (−14 dB, Pf = 0.4)Replace the softmax function in CNN with SVM to obtain the classifier to improve detection performance.
Jintao Zhang et al. [ ]2022Multi-band sample covariance matricesMJCM-CNN98% (−16 dB, Pf = 0.1)The proposed method can efficiently learn potential dependent features across frequency bands. Performance improvement over CM-CNN.
Yanyan Duan et al. [ ]2023Covariance matrixKPCA-CNN97% (−3 dB)The algorithm makes full use of the raw information and improves the access of cognitive users to the cognitive vehicular network.
Kursat Tekbiyik et al. [ ]2021Spectral correlation functionSCF-CNN96% (6 dB)Better performance than other DL methods under stringent channel conditions.
Keunhong Chae et al. [ ]2023A matrix composed of auto-correlation functions for each antennaDS2MA-CNN95% (−22 dB, Pf = 0.1, correlation coefficient = 0.3)The proposed model has the best performance under impulsive noise channel.
AuthorYearInputModelDetection ProbabilityAdvantage
S. S. Chandra et al. [ ]2021ES featureResNet90.5% (−10 dB)Comparing the other models with the same feature inputs, ResNet has the best performance.
X. Ren et al. [ ]2022Spatio-temporal featureNN-ResNet90% (−11 dB)Ability to make better predictions with fewer sensors and lower error rates.
Gai J et al. [ ]2022Two-dimensional time–frequency matrixSTFT-ImpResNet94% (−19 dB, noise power = 1.5 dBW)The robustness and detection probability of this model is better than STFT-CNN, SVM, etc.
Zhen P et al. [ ]2022Time–frequency matrix obtained after signal processing by wavelet variationWT-ResNet91% (−14 dB)Improved detection of non-stationary signals in low signal-to-noise ratio environments.
AuthorYearInputModelPerformancesAdvantage
Balwani N et al. [ ]2019The previous sensing event and present sensing eventLSTMPd = 91% (−10 dB)Ability to improve detection probability and classification accuracy in low signal-to-noise ratio environments.
Soni B et al. [ ]2020Temporal correlationLSTM-SSPd = 99% (−10 dB)Innovative proposal of PAS-SS to improve detection probability by calculating PU activity statistics.
Bkassiny M [ ]2022Raw data and cyclostationary featureLSTMPd = 99.4% (20 dB)The model is suitable for classification by modulation type and pulse shape of communication signals.
Chen W et al. [ ]2022Covariance matrix of the signals received by the arrayCM-LSTMPd = 100% (−10 dB)The model performs better than other existing methods in a multi-antenna environment.
Yu L et al. [ ]2018Data of single spectrum point with temporal correlationTaguchi method + LSTMCDF = 90% (RMSE = 15)Optimizing the network by introducing Taguchi’s method to reduce time consumption and computational resources.
Arunachalam G et al. [ ]2023Energy and correlation featuresCuttle Fish + LSTMPd = 90% (−20 dB)The model achieves lower complexity and low computational overhead compared to other existing LSTM models.
AuthorYearInputModelPerformancesAdvantage
Ruiyan D U et al. [ ]2019Cyclostationary features of training samplesWavelet Transform + ANNPd = 90% (−15 dB)Enhanced detection performance in low-SNR environments.
Nasser A et al. [ ]2021ED, ACD, EVM, EVMMHHS + ANNPd = 89% (−15 dB)The model can improve the detection probability by learning the information provided by multiple detectors.
Wang Y et al. [ ]2021Characterization between the phase-difference distributions of noise-perturbed signals and Gaussian noisePDD, BPDDPDD: Pd = 90% (−15 dB, Pf = 0.5, AWGN channels) BPDD: Pd = 83% (−15 dB, Pf = 0.5, AWGN)When the carrier frequency of the sensed signal is unknown, the proposed BPDD model outperforms other existing schemes.
Zhang X et al. [ ]2023Wideband spectrum signalsADMM + DNNMSE = 0.75 (−10 dB)The model accelerates convergence at lower sampling rates and is robust at low signal-to-noise ratios.
Zhao R et al. [ ]2023Features such as correlation, texture, shape, and power in spectrogramsCCD-GANPrecision = 100% (Recall = 0.4, MAP = 95.04)The model can effectively solve the domain adaptive problem and improve the migration learning to further enhance the generalization ability.
Li X et al. [ ]2023Characteristics of data distribution in different time periodsTFF aDCNNRecovery Probability of Support Set = 0.91 (−8 dB)The proposed model performs well with very low SNRs and fewer sampled channels.
Spectrum SensingReferencesMethod/ModelPerformanceApplication Scenario
Based on conventional methods[ , , ]Energy detectionPerforms well in high-SNR and stable noise environments.Suitable for scenarios where the main user signal information is not known, the phase requirement is low, and the SNR is not low.
[ , ]Cyclostationary feature detection  Performs well in sensing modulated signals or signals with cyclostationary feature, but high algorithmic complexity leads to long sensing time and low network throughput.Scenarios that need to distinguish between noise energy and signal energy. Knows partial information about the PU signal and can work in lower-SNR environments.
[ , , ]Matched filter detectionBetter performance than energy detection in ideal environments.  Knowing a priori information about the signal, higher SNR, and higher phase synchronization.
[ , , , , , , ]Cooperative spectrum sensingEliminates noisy signals and interference from malicious users for better spectrum monitoring and sharing than single-node spectrum sensing.  The environment allows for effective linkage of sensory information from multiple nodes or devices. The environment suffers from channel multipath fading, shadowing effects, and receiver instabilities.
Based on deep learning[ , , , , , , , , ]CNNBy extracting higher-order statistical features of the signal, it is possible to achieve higher detection probabilities at low SNRs, and the model is also more robust.Do not need a priori information about the signal and want to improve the detection probability and robustness at low SNRs.
[ , , , ]ResNetImprovements on CNN models and, in general, some performance gains over CNNs.  Want to further increase the depth of the CNN, thus achieving better performance and avoiding the problem of gradient drop in DCNNs.
[ , , , , , ]LSTM  Higher accuracy can be achieved at a low SNR through efficient learning of raw signal data or correlation information between signals.The need to learn complex and noisy spectrum data for tasks that require long sequences with long-term dependencies.
[ , , , , ]DQNIt allows the system to make more accurate decisions in dynamic environments and improves the robustness and accuracy of sensing models.Looking to address distributed decision making, synchronization issues, security, and robustness in CSS, or to improve sensing accuracy in multi-user and dynamic scenarios.
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Zhang, Y.; Luo, Z. A Review of Research on Spectrum Sensing Based on Deep Learning. Electronics 2023 , 12 , 4514. https://doi.org/10.3390/electronics12214514

Zhang Y, Luo Z. A Review of Research on Spectrum Sensing Based on Deep Learning. Electronics . 2023; 12(21):4514. https://doi.org/10.3390/electronics12214514

Zhang, Yixuan, and Zhongqiang Luo. 2023. "A Review of Research on Spectrum Sensing Based on Deep Learning" Electronics 12, no. 21: 4514. https://doi.org/10.3390/electronics12214514

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