Collaborative Cognitive Wireless Network Optimization Model and Network Parameter Optimization Algorithm by Tao Zhang

“…Such cognitive radio networks that use user collaboration to improve channel capacity and spectrum utilization are called collaborative cognitive radio networks. …”
Get full text

Design and Study of Cognitive Network Physical Layer Simulation Platform by Yongli An, Dong Wang, Yang Xiao

“…Cognitive radio technology has received wide attention for its ability to sense and use idle frequency. …”
Get full text

Distributed cooperative spectrum sensing based on consensus optimization by ZENG Fan-zi, LIU Jie, LI Ren-fa, ZENG Qing-guang

“…A distributed wideband spectrum compressive sensing approach based on consensus optimization was developed.The cognitive radio users firstly collected the time-domain sampling by compressive sampling and recover the local spectrum.Then the spectrum of primary users is recovered jointly by cooperative cognitive radio users,which utilizes iterative consensus optimization to reach globally sensing outcomes via one-hop local communication only.In particular,a weighted consensus-averaging constraint is introduced to reduce the number of the consensus constraints,which lowers the computation loads and expedites the convergence.The convergence of the proposed distributed cooperative spectrum sensing scheme is proved analytically.Simulations demonstrate that the proposed scheme can effectively sense the spectrum from compressive sample.…”
Get full text

An Analytical Approach to Opportunistic Transmission under Rayleigh Fading Channels by Yousaf Bin Zikria, Sung Won Kim, Heejung Yu, Seung Yeob Nam

“…In cognitive radio sensor networks, the routing methods including multiple relays have been extensively studied to achieve higher throughput and lower end-to-end delay. …”
Get full text

High Energy Efficient Heterogeneous Networks: Cooperative and Cognitive Techniques by Heng Wang, Jiamo Jiang, Jian Li, Manzoor Ahmed, Mugen Peng

“…As the promising solution for improving the performance of HetNet, both the cooperative communication and cognitive radio techniques to mitigate the interference in HetNet are surveyed. …”
Get full text

Key technologies and research progresses in cognitive SWIPT by Xiaorong XU, Minghang SUN, Linhui SHEN, Yingbiao YAO, Wei FENG

“…The combination of cognitive radio (CR) and simultaneous wireless information and power transfer (SWIPT) has become one of the research hotspots in modern high-efficient cognitive radio communications.Firstly,the introduction of SWIPT and cognitive SWIPT were illustrated.Secondly,two types of receiver structures commonly used in SWIPT networks were introduced and the corresponding energy harvesting formulas were given.Thirdly,system model of cognitive SWIPT network and the research progresses of cognitive SWIPT combined with cooperative relaying and MIMO were presented respectively.Future research prospects of the key technologies in cognitive SWIPT network were investigated.Finally,some recent research achievements of the key technologies in cognitive SWIPT were given.Certain referencing values in the theoretical research and future practical applications of high energy-efficient secure cognitive SWIPT communication network were provided.…”
Get full text

Effective and fair cognitive terminal assignment scheme for cooperative spectrum sensing by WU Zhiqiang, LIU Qianli, LIU Jiabin, FENG Qing, XIAO Shanpeng, LIU Shang

“…Cooperative spectrum sensing is regarded as the foundation and a key stage of cognitive radio networks. The node allocation strategy during the spectrum detection process was directly determined by the results of joint spectrum sensing. …”
Get full text

Exploiting Multiple Channels for Low Latency and Semireliable Broadcasting in Cognitive Wireless Sensor Networks by Tae-Sung Kim, Sok-Hyong Kim, Bo-Kyum Kim, Young-Yong Kim

“…For efficient and semireliable broadcast in cognitive radio WSNs, we focus on reducing broadcast latency and achieving 100% delivery percentage. …”
Get full text

Dynamic spectrum access method for femtocells in LTE by Xu-zhou ZUO, Wei-wei XIA, Lian-feng SHEN

“…Dynamic spectrum access method for femtocells in LTE using cognitive radio method to meet the communication requestions was investigated.An uplink sensing method was proposed.By this method,femtocells could not only identify occupied spectrums but also identify service categories of those spectrums.A dynamic spectrum assess method of power control and frequency hopping for femtocells that ensured a low pre-definable performance impact to macro users was proposed.The femtocell could adopt power control to access the spectrum that carried data service while adopt frequency hopping to access the spectrum that carried voice service.Simulation results show that the downlink throughput of the femtocell can be significantly increased by using proposed spectrum access method.…”
Get full text

Distributed energy efficient beamforming algorithm for multicell multiuser downlink system by Wen-yang CHEN, Shi-wen HE, Yong-ming HUANG, Lv-xi YANG

“…A distributed energy efficient beamforming algorithm was studied for multicell multiuser downlink communication system.Firstly,the energy efficient optimization problem was first considered as the maximization of the ratio between the system sum rate and the system power consumption.The fractional programming optimization target was then transformed into a subtractive form via using the fractional programming theorem.Secondly,the problem was decomposed into some subproblems that can be solved respectively by introducing the concept of the interference temperature in cognitive radio networks.Finally,an effective distributed energy efficient beamforming algorithm was proposed by exploiting the Lagrangian duality theorem and optimization theorem.Compared to the classical energy efficient optimization algorithm,the proposed algorithm can achieve an obvious energy efficiency performance gain.…”
Get full text

A survey of deep learning based modulation recognition by Shujun SUN, Shengliang PENG, Yudong YAO, Xi YANG

“…Modulation recognition is one of the fundamental tasks for communications systems, which can be widely applied in various fields, such as cognitive radio, intelligent communications, radio surveillance, electronic warfare, etc.In recent years, deep learning (DL) based modulation recognition has attracted great attention due to its superiority in feature extraction and recognition performance.The techniques of DL based modulation recognition were systematically summarized.Firstly, some knowledge relevant to DL based modulation recognition was introduced.Then, the system architecture, data pre-processing methods, deep neural network structures, prevalent datasets and performance metrics of DL based modulation recognition were illustrated.Finally, the future directions of DL based modulation recognition were also discussed.…”
Get full text

A new cooperation spectrum sensing algorithm based on energy detection by Caimei FU, Youming LI, Guili ZHOU, Mingchen YU, Jingwen TONG, Xupeng WANG

“…To improve the reliability of spectrum sensing in cognitive radio system,a new cooperation spectrum sensing algorithm was proposed.In this algorithm,the property of the low probability between adjacent frames of the states change was used and then the decision was made by combing the energy value of the current sensing frame with that of the neighboring frame.Therefore,the proposed algorithm could decrease the miss detection probability in case of the instantaneous signal energy dropping when primary user used the licensed spectrum.Furthermore,theoretical expressions for detection probability and false alarm probability were derived.Finally,theoretical analysis and simulation results verify that the detection performance of the proposed algorithm is better than that of cooperative spectrum sensing which is based on the classical energy detection.…”
Get full text

Distance criterion-based quantizer design for cooperative spectrum sensing by Yuanhua FU, Zhiming HE

“…In terms of sensing node’s energy and reporting channel’s bandwidth constrains problem for cooperative spectrum sensing in cognitive radio networks,an optimal quantizer design method based on distance criterion was proposed.First of all,the Bhattacharyya distance of received quantized data at the fusion center (FC) was calculated as performance criteria,the optimization mathematical model of the quantizer was constructed,and the optimum quantization thresholds were obtained by using particle swarm optimization algorithm.According to received sensing nodes’ quantized data at the FC,a log-likelihood ratio detector was constructed to decide the presence or absence of primary user signal,the upper bound to sensing performance of energy detector that without quantization was derived.Compared with the existing methods in literatures,the performance of proposed 3-bit quantization method approaches to the upper bound performance of energy detector,under the premise of obtaining comparable detection performance,the requirement of communication bandwidth is reduced.…”
Get full text

Cyclostationary Feature Detection Based on Compressed Sensing and Wavelet De-Noising by Haifeng Tan, Jun Lu, Xuan Fu, Qixun Zhang

“…To improve the vacant spectrum utilization，ultra-wideband spectrum sensing is critical for cognitive radio （CR）as it enables secondary users to dynamically access the unoccupied spectrum bands.However，the fast and accurate spectrum sensing is still a challenge over an ultra-wide bandwidth in low signal to noise ratio（SNR） environment.A compressed sensing （CS）-feature detector based on wavelet de-noising was proposed to perform wideband detection in low SNR.CS was proposed to improve the efficiency of wideband spectrum sensing.And two dimensional wavelet transform was introduced to deal with the noise in spectral coherence function（SCF）by the CS process.As a result，the detection accuracy in low SNR was improved.It is found that the proposed technology can detect spectrum holes at a range of low SNR through simulation results.…”
Get full text

Power allocation algorithm of full duplex cognitive relay network based on energy harvesting by Shibing ZHANG, Liuke HAN, Meijuan ZHANG

“…To alleviate the shortage of spectrum resources and improve the power utilization of cognitive radio networks,a resource allocation algorithm of full duplex cognitive relay networks with energy harvesting was proposed.In the algorithm,the coefficient for power splitting of the relay and the transmit power of the secondary users were jointly optimized to maximize the throughput of the secondary users under the interference to primary users and energy harvesting constraints.Since the optimization of the algorithm was non-convex,it was transformed into two sub-optimizations,the sub-optimization of the coefficient for power splitting and the sub-optimization of the power transmitted of secondary users,which were the solvable convex sub-optimizations.Then,the final solution of the original optimization was obtained with the iterative algorithm.Simulation results show that the throughput of the proposed algorithm,can obtain 2 times throughput of the networks with half-duplex power splitting algorithm and 1.5 times throughput of the networks with full-duplex time switching algorithm.…”
Get full text

Two-Step Frequency Estimation of GNSS Signal in High-Dynamic Environment by Chao Wu, Yafeng Li, Liyan Luo, Jian Xie, Ling Wang

Get full text

Sensing-then-transmission slot scheduling optimization for opportu-nistic spectrum access under the interference constraint of primary us-ers by Jing ZHANG, Yin LU, Xi-qi GAO, Fu-chun ZHENG

“…A sensing-then-transmission slot scheduling scheme for opportunistic spectrum access under the interference constraint of primary users (PU) was proposed.First,the throughput of the cognitive radio system (CRS) with channel handoff mechanism and the interference ratio to PU were deduced.An optimization model combined the sensing time and sensing period was also set up.Then,the optimal sensing time and sensing period were derived by maximizing the throughput of the CRS subject to both interference ratio and sensing qua ity constraints.Based on the analysis,a time slot scheduling scheme was finally proposed.The achievable maximum throughput of the CRS was derived too.Simulation results indicate that the proposed slot scheduling scheme can enhance the throughput of the CRS,and fit the changes of interference ratio and sensing quality constraints better.…”
Get full text

Fast Two-Step Energy Detection for Spectrum Sensing by Meiling Lai, Shengliang Peng, Xi Yang, Lin Zhou

“…Spectrum sensing is one of the key tasks in cognitive radio. This paper proposes a fast two-step energy detection (FED) algorithm for spectrum sensing via improving the sampling process of conventional energy detection (CED). …”
Get full text

SPECTRUM OCCUPANCY MEASUREMENT AND ANALYSIS AT OSUN STATE UNIVERSITY CAMPUS, OSOGBO, NIGERIA by HAMMED OYEBAMIJI LASISI, BOLATITO FATIMAH ADERINKOLA, FUNMILOLA MARGARET ADEAGBO

“…This indicated that large portion of the spectrum is unoccupied, and cognitive radio, stands a good chance of being deployed in the examined bands. …”
Get full text

Energy Efficiency Maximization with Optimal Beamforming in Secure MISO CRNs with SWIPT by Liang Xue, Yao Ma, Miao Zhang, Wanqiang Qin, Jin-Long Wang, Yazhou Wu

“…In this paper, the optimal beamforming problem of multi-input single-output (MISO) cognitive radio (CR) downlink networks with simultaneous wireless information and power transfer is studied. …”
Get full text