- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) - Sydney, Australia (2018.11.10-2018.11.17)] 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC) - A Laser-based Time Calibration System for the MEG II Timing Counter
摘要： Wireless sensor networks (WSNs) can utilize the unlicensed industrial, scientific, and medical (ISM) band to communicate the sensed data. The ISM band has been already saturated due to the overlaid deployment of WSNs. To solve this problem, WSNs have been powered up by cognitive radio (CR) capability. By using CR capability, WSNs can utilize the spectrum holes opportunistically. The sensor nodes, which need large bandwidth to transmit their sensed data from source to destination require some scheme, which should be able to provide them a wide band channel whenever required. Channel bonding (CB) is a technique through which multiple contiguous channels can be combined to form a single wide band channel. By using CB technique, CR-based WSN nodes attempt to find and combine contiguous channels to avail larger bandwidth. In this paper, we show that by increasing the number of channels, the probability of finding contiguous channels decreases. Moreover, we then propose a primary-radio (PR) user-activity-aware CB algorithm and compare it with three state-of-the-art schemes: SWA, KNOWS, and AGILE. It has been demonstrated through extensive NS-2 simulations that intelligent CB decisions can reduce harmful interference to PR nodes. We find that CB in CR sensor networks attempts to provide greater bandwidth and utilizes the spectrum effectively.
关键词： cognitive radio,dynamic spectrum access,Channel bonding,wireless sensor networks
更新于2025-09-23 15:19:57
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[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Dual-wideband Cross Polarization Conversion Metasurface Based on a Symmetric Split Ring Resonator
摘要： Energy-ef?ciency is a signi?cant parameter contributing to the performance of coordinated cognitive radio networks (CCRNs). To estimate the average value of sensing and reporting energy ef?ciency of CCRN, a new metric is proposed. This paper presents a new metric based on the gain from the coordination of missed detection and false alarm probabilities that minimize the interference on the primary users and maximize the throughput for cognitive terminals (CTs), respectively. Furthermore, the proposed maximum metric is placed by analytically ?guring out the optimum number of coordinated CTs. The global average value of energy ef?ciency of sensing and reporting process among coordinated CTs with various probabilities of missed detection and false alarm is formulated. In addition, a new iterative CTs assignment strategy is proposed. Finally, the average energy-ef?ciency results are signi?cantly enhanced as shown by simulations.
关键词： coordinated cognitive radio network (CCRN),Energy-ef?ciency,metric
更新于2025-09-23 15:19:57
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[IEEE 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - Kyoto, Japan (2019.7.2-2019.7.5)] 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - How to use Synchrotron Soft X-Ray for Analysis of Perovskite Solar Cell
摘要： Wireless sensor networks (WSNs) can utilize the unlicensed industrial, scientific, and medical (ISM) band to communicate the sensed data. The ISM band has been already saturated due to the overlaid deployment of WSNs. To solve this problem, WSNs have been powered up by cognitive radio (CR) capability. By using CR capability, WSNs can utilize the spectrum holes opportunistically. The sensor nodes, which need large bandwidth to transmit their sensed data from source to destination require some scheme, which should be able to provide them a wide band channel whenever required. Channel bonding (CB) is a technique through which multiple contiguous channels can be combined to form a single wide band channel. By using CB technique, CR-based WSN nodes attempt to find and combine contiguous channels to avail larger bandwidth. In this paper, we show that by increasing the number of channels, the probability of finding contiguous channels decreases. Moreover, we then propose a primary-radio (PR) user-activity-aware CB algorithm and compare it with three state-of-the-art schemes: SWA, KNOWS, and AGILE. It has been demonstrated through extensive NS-2 simulations that intelligent CB decisions can reduce harmful interference to PR nodes. We find that CB in CR sensor networks attempts to provide greater bandwidth and utilizes the spectrum effectively.
关键词： cognitive radio,dynamic spectrum access,Channel bonding,wireless sensor networks
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Technoeconomic Analysis of Photovoltaics Module Manufacturing with Thin Silicon Wafers
摘要： Under the case of exponentially growth of wireless services and the scarcity of spectrum resources, cognitive radio (CR) has been proposed to access licensed channels opportunistically, and thus improve spectrum utilization. In CR devices, accurate spectrum sensing is the prerequisite for opportunistic access. The current cooperative spectrum sensing still cannot effectively exploit the temporal correlations among sensing data, especially the correlations between the current sensing data and the historical data. This paper uses sticky hierarchical Dirichlet process-hidden Markov model to exploit the historical sensing data of multiple users, and classi?es the historical sensing data into groups according to their latent spectrum states. The proposed spectrum sensing algorithm can fuse the historical sensing data into prior knowledge, which can be used to improve the accuracy in spectrum decision. Furthermore, a rejection process is proposed to ?lter out some sensing data with high uncertainty in classi?cation, which guarantees the effectiveness of historical sensing data. The simulation results show that the proposed algorithm performs the best, compared with other three typical cooperative spectrum sensing algorithms, in terms of detection probability and false alarm probability. Speci?cally, when the false alarm probability is 0.2, the proposed algorithm has more than 10% and 60% detection probability improvement under channel signal-to-noise ratio as 0 and ?5 dB, respectively.
关键词： hidden Markov model,Cognitive radio,hierarchical Dirichlet process,historical sensing data mining,spectrum sensing
更新于2025-09-23 15:19:57
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Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization
摘要： In this paper, we introduce transmit antenna selection/maximal-ratio combining (TAS/MRC) scheme in dual-hop randomize-and-forward (RaF) cognitive multiple-input multiple-output (MIMO) wiretap networks with outdated channel state information (CSI). In this network, the secondary transmitter adopts the TAS scheme to choose the antenna with the maximal received signal-to-noise ratio (SNR), while the secondary receiver and the eavesdropper adopt the MRC scheme to combine the received signals. To thoroughly assess the secrecy performance achieved by the TAS/MRC scheme and the impact of outdated CSI on the secrecy performance, we derive a new closed-form expression for the secrecy outage probability of dual-hop RaF cognitive MIMO wiretap networks. In order to achieve more insights on the application of TAS/MRC scheme, we further present tractable asymptotic secrecy outage probability at high SNR regimes under two distinct scenarios. From our analysis, several important concluding remarks are obtained as follows: 1) the RaF relaying strategy achieves better secrecy performance than that of the decode-and-forward relaying strategy for dual-hop cognitive MIMO wiretap networks; 2) outdated CSI decreases the secrecy diversity gain of the TAS/MRC scheme from NR min (NA, NB) to min (NR, NB); and 3) although TAS/MRC scheme cannot attain full secrecy diversity gain for the considered system with outdated CSI, it still can achieve an extra secrecy coding gain compared with the random antenna selection/MRC scheme.
关键词： Cognitive radio networks,secrecy outage probability,MIMO,outdated channel state information
更新于2025-09-19 17:13:59
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Perovskite Solar Cell Using Binary Iodide Gel Polymer Electrolytes
摘要： Spectrum efficiency and energy efficiency are two critical issues in the design of wireless communication networks. Recently, energy harvesting cognitive radio networks have been proposed to attempt to solve both the issues simultaneously. In this paper, we consider a cognitive radio network in which a primary transmitter mainly occupies the channel, and a secondary transmitter equipped with an energy harvesting device is allowed to opportunistically access the primary channel at any time if it is detected to be idle. Here, we assume that energy arrival process and primary channel state are random process and two-state time-homogenous discrete Markov process, respectively. Instead of the expected number of successful spectrum access attempts per time slot as a design criterion in current literature, we use the average channel capacity as the achievable throughput to jointly optimize energy harvesting and spectrum sensing subject to the constraints on the energy causality, collision, and temporal correlation of probability of sensing the idle/occupied channel, thus achieving or almost achieving both the energy efficiency and the spectrum efficiency in certain conditions. In addition, the corresponding optimum detection threshold and the maximum achievable throughput are obtained, which are substantiated by our comprehensive computer simulations.
关键词： achievable throughput,detection threshold,energy harvesting,spectrum sensing,Cognitive radio network
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE International Conference on Power, Intelligent Computing and Systems (ICPICS) - Shenyang, China (2019.7.12-2019.7.14)] 2019 IEEE International Conference on Power, Intelligent Computing and Systems (ICPICS) - Infrared and Visible Image Fusion Based on RPCA and NSST
摘要： Energy-ef?ciency is a signi?cant parameter contributing to the performance of coordinated cognitive radio networks (CCRNs). To estimate the average value of sensing and reporting energy ef?ciency of CCRN, a new metric is proposed. This paper presents a new metric based on the gain from the coordination of missed detection and false alarm probabilities that minimize the interference on the primary users and maximize the throughput for cognitive terminals (CTs), respectively. Furthermore, the proposed maximum metric is placed by analytically ?guring out the optimum number of coordinated CTs. The global average value of energy ef?ciency of sensing and reporting process among coordinated CTs with various probabilities of missed detection and false alarm is formulated. In addition, a new iterative CTs assignment strategy is proposed. Finally, the average energy-ef?ciency results are signi?cantly enhanced as shown by simulations.
关键词： metric,coordinated cognitive radio network (CCRN),Energy-ef?ciency
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Impact of Photovoltaic Module Performance Degradation Rate on LCOE of Utility Scale Systems
摘要： Energy-ef?ciency is a signi?cant parameter contributing to the performance of coordinated cognitive radio networks (CCRNs). To estimate the average value of sensing and reporting energy ef?ciency of CCRN, a new metric is proposed. This paper presents a new metric based on the gain from the coordination of missed detection and false alarm probabilities that minimize the interference on the primary users and maximize the throughput for cognitive terminals (CTs), respectively. Furthermore, the proposed maximum metric is placed by analytically ?guring out the optimum number of coordinated CTs. The global average value of energy ef?ciency of sensing and reporting process among coordinated CTs with various probabilities of missed detection and false alarm is formulated. In addition, a new iterative CTs assignment strategy is proposed. Finally, the average energy-ef?ciency results are signi?cantly enhanced as shown by simulations.
关键词： coordinated cognitive radio network (CCRN),Energy-ef?ciency,metric
更新于2025-09-19 17:13:59
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Tunable Low-Spurious Heterodyne-Dual-Injection-Locked Optoelectronic Oscillator
摘要： The use of fingerprint embedding at the physical layer enables a receiver to authenticate a transmitter by detecting a low-power authentication tag superimposed upon the message waveform; a theoretical framework for such fingerprinting has been outlined. We carry out single-carrier single-antenna software defined radio (SDR) experiments with a wireless communications link over which we transmit and receive packets with the embedded fingerprinting. We analyze these experimental results and find they match well with theoretical predictions. This paper demonstrates that the method of superimposed fingerprints can deliver high probability of authentication without additional bandwidth and with minimal impact on bit-error rate in SDR systems.
关键词： communication system security,Cognitive radio,message authentication
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Electromechanical and Energy Systems (SIELMEN) - Craiova, Romania (2019.10.9-2019.10.11)] 2019 International Conference on Electromechanical and Energy Systems (SIELMEN) - The Photovoltaic Greenhouses - a Challenge for Republic of Moldova
摘要： The latest trends in spectrum trading allow secondary users (SUs) to employ hybrid access models and exploit bandwidth employing either opportunistic spectrum access or exclusive spectrum access of vacant frequency bands (FBs) leased for exclusive usage. In this paper, the spectrum trading problem is addressed in an operational framework, where a primary spectrum owner (PSO) allocates specific FBs to a number of primary users (PUs) and at the same time allows SUs belonging to multiple service classes to operate opportunistically in a part of the spectrum primarily allocated to the PU operation. By offering exclusive bandwidth-price contracts to SUs in FBs, which are excluded from the PU access, the PSO expects additional revenue. In this framework, the PSO aims at maximizing its revenue through optimal contract design that considers the multiple SU service classes, about which the PSO may have at its disposal either complete or incomplete information. In the first case, it is proven that only one type of contract destined for the highest SU service class is profitable to the PSO. In the second case, two heuristic algorithms are proposed for the optimal contract design corresponding to offering a single contract or multiple contracts to various service classes. The simulation results for the complete and incomplete information cases have been examined with regard to the SU service classes and the number and transmission specifications of the PUs. The two proposed algorithms manage to address the incomplete information case and be close to the optimal values obtained when complete information is available. Finally, the social welfare, as the aggregate expected utility of all parties involved, is examined.
关键词： hybrid spectrum access,spectrum trading,cognitive radio,Dynamic spectrum access,contract theory
更新于2025-09-19 17:13:59